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[85.224.9.34]) by smtp.gmail.com with ESMTPSA id t84sm974559lfi.21.2017.09.17.02.39.18 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 17 Sep 2017 02:39:19 -0700 (PDT) From: Linus Walleij To: Wolfram Sang , linux-i2c@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-mips@linux-mips.org, adi-buildroot-devel@lists.sourceforge.net, Geert Uytterhoeven , Linus Walleij , Steven Miao , Ralf Baechle , Lee Jones , Guenter Roeck , =?utf-8?b?VmlsbGUgU3lyasOkbMOk?= , Magnus Damm , Ben Dooks , Heiko Schocher Subject: [PATCH 1/7] i2c: gpio: Convert to use descriptors Date: Sun, 17 Sep 2017 11:39:00 +0200 Message-Id: <20170917093906.16325-2-linus.walleij@linaro.org> X-Mailer: git-send-email 2.13.5 In-Reply-To: <20170917093906.16325-1-linus.walleij@linaro.org> References: <20170917093906.16325-1-linus.walleij@linaro.org> MIME-Version: 1.0 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org This converts the GPIO-based I2C-driver to using GPIO descriptors instead of the old global numberspace-based GPIO interface. We: - Convert the driver to unconditionally grab two GPIOs from the device by index 0 (SDA) and 1 (SCL) which will work fine with device tree and descriptor tables. The existing device trees will continue to work just like before, but without any roundtrip through the global numberspace. - Brutally convert all boardfiles still passing global GPIOs by registering descriptor tables associated with the devices instead so this driver does not need to keep supporting passing any GPIO numbers as platform data. There is no stepwise approach as elegant as this, I strongly prefer this big hammer over any antsteps for this conversion. This way the old GPIO numbers go away and NEVER COME BACK. Special conversion for the different boards utilizing I2C-GPIO: - EP93xx (arch/arm/mach-ep93xx): pretty straight forward as all boards were using the same two GPIO lines, just define these two in a lookup table for "i2c-gpio" and register these along with the device. None of them define any other platform data so just pass NULL as platform data. This platform selects GPIOLIB so all should be smooth. The pins appear on a gpiochip for bank "G" as pins 1 (SDA) and 0 (SCL). - IXP4 (arch/arm/mach-ixp4): descriptor tables have to be registered for each board separately. They all use "IXP4XX_GPIO_CHIP" so it is pretty straight forward. Most board define no other platform data than SCL/SDA so they can drop the #include of and assign NULL to platform data. The "goramo_mlr" (Goramo Multilink Router) board is a bit worrisome: it implements its own I2C bit-banging in the board file, and optionally registers an I2C serial port, but claims the same GPIO lines for itself in the board file. This is not going to work: there will be competition for the GPIO lines, so delete the optional extra I2C bus instead, no I2C devices are registered on it anyway, there are just hints that it may contain an EEPROM that may be accessed from userspace. This needs to be fixed up properly by the serial clock using I2C emulation so drop a note in the code. - KS8695 board acs5k (arch/arm/mach-ks8695/board-acs5.c) has some platform data in addition to the pins so it needs to be kept around sans GPIO lines. Its GPIO chip is named "KS8695" and the arch selects GPIOLIB. - PXA boards (arch/arm/mach-pxa/*) use some of the platform data so it needs to be preserved here. The viper board even registers two GPIO I2Cs. The gpiochip is named "gpio-pxa" and the arch selects GPIOLIB. - SA1100 Simpad (arch/arm/mach-sa1100/simpad.c) defines a GPIO I2C bus, and the arch selects GPIOLIB. - Blackfin boards (arch/blackfin/bf533 etc) for these I assume their I2C GPIOs refer to the local gpiochip defined in arch/blackfin/kernel/bfin_gpio.c names "BFIN-GPIO". The arch selects GPIOLIB. The boards get spiked with IF_ENABLED(I2C_GPIO) but that is a side effect of it being like that already (I would just have Kconfig select I2C_GPIO and get rid of them all.) I also delete any platform data set to 0 as it will get that value anyway from static declartions of platform data. - The MIPS selects GPIOLIB and the Alchemy machine is using two local GPIO chips, one of them has a GPIO I2C. We need to adjust the local offset from the global number space here. The ATH79 has a proper GPIO driver in drivers/gpio/gpio-ath79.c and AFAICT the chip is named "ath79-gpio" and the PB44 PCF857x expander spawns from this on GPIO 1 and 0. The latter board only use the platform data to specify pins so it can be cut altogether after this. - The MFD Silicon Motion SM501 is a special case. It dynamically spawns an I2C bus off the MFD using sm501_create_subdev(). We use an approach to dynamically create a machine descriptor table and attach this to the "SM501-LOW" or "SM501-HIGH" gpiochip. We use chip-local offsets to grab the right lines. We can get rid of two local static inline helpers as part of this refactoring. Cc: Steven Miao Cc: Ralf Baechle Cc: Lee Jones Cc: Guenter Roeck Cc: Ville Syrjälä Cc: Magnus Damm Cc: Ben Dooks Cc: Heiko Schocher Acked-by: Olof Johansson Signed-off-by: Linus Walleij --- ChangeLog v1->v2: - Fix a minor typo in error path (scl was sda from copy-paste) - Collected Olof's ACK Steven (Blackfin): requesting ACK for Wolfram to take this patch. Ralf (MIPS): requesting ACK for Wolfram to take this patch. Lee: requesting ACK for Wolfram to take this patch. SM501 users: requesting Tested-by on this patch. --- arch/arm/mach-ep93xx/core.c | 39 ++++---- arch/arm/mach-ep93xx/edb93xx.c | 15 +-- arch/arm/mach-ep93xx/include/mach/platform.h | 4 +- arch/arm/mach-ep93xx/simone.c | 12 +-- arch/arm/mach-ep93xx/snappercl15.c | 12 +-- arch/arm/mach-ep93xx/vision_ep9307.c | 7 +- arch/arm/mach-ixp4xx/avila-setup.c | 17 +++- arch/arm/mach-ixp4xx/dsmg600-setup.c | 16 +++- arch/arm/mach-ixp4xx/fsg-setup.c | 16 +++- arch/arm/mach-ixp4xx/goramo_mlr.c | 24 ++--- arch/arm/mach-ixp4xx/ixdp425-setup.c | 16 +++- arch/arm/mach-ixp4xx/nas100d-setup.c | 16 +++- arch/arm/mach-ixp4xx/nslu2-setup.c | 16 +++- arch/arm/mach-ks8695/board-acs5k.c | 13 ++- arch/arm/mach-pxa/palmz72.c | 12 ++- arch/arm/mach-pxa/viper.c | 27 +++++- arch/arm/mach-sa1100/simpad.c | 12 ++- arch/blackfin/mach-bf533/boards/blackstamp.c | 19 +++- arch/blackfin/mach-bf533/boards/ezkit.c | 18 +++- arch/blackfin/mach-bf533/boards/stamp.c | 18 +++- arch/blackfin/mach-bf561/boards/ezkit.c | 18 +++- arch/mips/alchemy/board-gpr.c | 19 +++- arch/mips/ath79/mach-pb44.c | 16 +++- drivers/i2c/busses/i2c-gpio.c | 134 +++++++++++++-------------- drivers/mfd/sm501.c | 49 +++++----- include/linux/i2c-gpio.h | 4 - 26 files changed, 327 insertions(+), 242 deletions(-) -- 2.13.5 Acked-by: Lee Jones Acked-by: Ralf Baechle diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c index c393b1b0310d..6b4754ecaffc 100644 --- a/arch/arm/mach-ep93xx/core.c +++ b/arch/arm/mach-ep93xx/core.c @@ -31,7 +31,7 @@ #include #include #include -#include +#include #include #include #include @@ -320,42 +320,45 @@ void __init ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr) /************************************************************************* * EP93xx i2c peripheral handling *************************************************************************/ -static struct i2c_gpio_platform_data ep93xx_i2c_data; + +/* All EP93xx devices use the same two GPIO pins for I2C bit-banging */ +static struct gpiod_lookup_table ep93xx_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + /* Use local offsets on gpiochip/port "G" */ + GPIO_LOOKUP_IDX("G", 1, NULL, 0, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("G", 0, NULL, 1, GPIO_ACTIVE_HIGH), + }, +}; static struct platform_device ep93xx_i2c_device = { .name = "i2c-gpio", .id = 0, .dev = { - .platform_data = &ep93xx_i2c_data, + .platform_data = NULL, }, }; /** * ep93xx_register_i2c - Register the i2c platform device. - * @data: platform specific i2c-gpio configuration (__initdata) * @devices: platform specific i2c bus device information (__initdata) * @num: the number of devices on the i2c bus */ -void __init ep93xx_register_i2c(struct i2c_gpio_platform_data *data, - struct i2c_board_info *devices, int num) +void __init ep93xx_register_i2c(struct i2c_board_info *devices, int num) { /* - * Set the EEPROM interface pin drive type control. - * Defines the driver type for the EECLK and EEDAT pins as either - * open drain, which will require an external pull-up, or a normal - * CMOS driver. + * FIXME: this just sets the two pins as non-opendrain, as no + * platforms tries to do that anyway. Flag the applicable lines + * as open drain in the GPIO_LOOKUP above and the driver or + * gpiolib will handle open drain/open drain emulation as need + * be. Right now i2c-gpio emulates open drain which is not + * optimal. */ - if (data->sda_is_open_drain && data->sda_pin != EP93XX_GPIO_LINE_EEDAT) - pr_warning("sda != EEDAT, open drain has no effect\n"); - if (data->scl_is_open_drain && data->scl_pin != EP93XX_GPIO_LINE_EECLK) - pr_warning("scl != EECLK, open drain has no effect\n"); - - __raw_writel((data->sda_is_open_drain << 1) | - (data->scl_is_open_drain << 0), + __raw_writel((0 << 1) | (0 << 0), EP93XX_GPIO_EEDRIVE); - ep93xx_i2c_data = *data; i2c_register_board_info(0, devices, num); + gpiod_add_lookup_table(&ep93xx_i2c_gpiod_table); platform_device_register(&ep93xx_i2c_device); } diff --git a/arch/arm/mach-ep93xx/edb93xx.c b/arch/arm/mach-ep93xx/edb93xx.c index 0ac176386789..7e8f6f580fc3 100644 --- a/arch/arm/mach-ep93xx/edb93xx.c +++ b/arch/arm/mach-ep93xx/edb93xx.c @@ -28,7 +28,6 @@ #include #include #include -#include #include #include @@ -61,14 +60,6 @@ static struct ep93xx_eth_data __initdata edb93xx_eth_data = { /************************************************************************* * EDB93xx i2c peripheral handling *************************************************************************/ -static struct i2c_gpio_platform_data __initdata edb93xx_i2c_gpio_data = { - .sda_pin = EP93XX_GPIO_LINE_EEDAT, - .sda_is_open_drain = 0, - .scl_pin = EP93XX_GPIO_LINE_EECLK, - .scl_is_open_drain = 0, - .udelay = 0, /* default to 100 kHz */ - .timeout = 0, /* default to 100 ms */ -}; static struct i2c_board_info __initdata edb93xxa_i2c_board_info[] = { { @@ -86,13 +77,11 @@ static void __init edb93xx_register_i2c(void) { if (machine_is_edb9302a() || machine_is_edb9307a() || machine_is_edb9315a()) { - ep93xx_register_i2c(&edb93xx_i2c_gpio_data, - edb93xxa_i2c_board_info, + ep93xx_register_i2c(edb93xxa_i2c_board_info, ARRAY_SIZE(edb93xxa_i2c_board_info)); } else if (machine_is_edb9302() || machine_is_edb9307() || machine_is_edb9312() || machine_is_edb9315()) { - ep93xx_register_i2c(&edb93xx_i2c_gpio_data, - edb93xx_i2c_board_info, + ep93xx_register_i2c(edb93xx_i2c_board_info, ARRAY_SIZE(edb93xx_i2c_board_info)); } } diff --git a/arch/arm/mach-ep93xx/include/mach/platform.h b/arch/arm/mach-ep93xx/include/mach/platform.h index 4c0bbd97f741..df2928aacf7c 100644 --- a/arch/arm/mach-ep93xx/include/mach/platform.h +++ b/arch/arm/mach-ep93xx/include/mach/platform.h @@ -7,7 +7,6 @@ #include struct device; -struct i2c_gpio_platform_data; struct i2c_board_info; struct spi_board_info; struct platform_device; @@ -36,8 +35,7 @@ void ep93xx_register_flash(unsigned int width, resource_size_t start, resource_size_t size); void ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr); -void ep93xx_register_i2c(struct i2c_gpio_platform_data *data, - struct i2c_board_info *devices, int num); +void ep93xx_register_i2c(struct i2c_board_info *devices, int num); void ep93xx_register_spi(struct ep93xx_spi_info *info, struct spi_board_info *devices, int num); void ep93xx_register_fb(struct ep93xxfb_mach_info *data); diff --git a/arch/arm/mach-ep93xx/simone.c b/arch/arm/mach-ep93xx/simone.c index c7a40f245892..e61f3dee24c2 100644 --- a/arch/arm/mach-ep93xx/simone.c +++ b/arch/arm/mach-ep93xx/simone.c @@ -19,7 +19,6 @@ #include #include #include -#include #include #include #include @@ -129,15 +128,6 @@ static struct ep93xx_spi_info simone_spi_info __initdata = { .use_dma = 1, }; -static struct i2c_gpio_platform_data __initdata simone_i2c_gpio_data = { - .sda_pin = EP93XX_GPIO_LINE_EEDAT, - .sda_is_open_drain = 0, - .scl_pin = EP93XX_GPIO_LINE_EECLK, - .scl_is_open_drain = 0, - .udelay = 0, - .timeout = 0, -}; - static struct i2c_board_info __initdata simone_i2c_board_info[] = { { I2C_BOARD_INFO("ds1337", 0x68), @@ -161,7 +151,7 @@ static void __init simone_init_machine(void) ep93xx_register_flash(2, EP93XX_CS6_PHYS_BASE, SZ_8M); ep93xx_register_eth(&simone_eth_data, 1); ep93xx_register_fb(&simone_fb_info); - ep93xx_register_i2c(&simone_i2c_gpio_data, simone_i2c_board_info, + ep93xx_register_i2c(simone_i2c_board_info, ARRAY_SIZE(simone_i2c_board_info)); ep93xx_register_spi(&simone_spi_info, simone_spi_devices, ARRAY_SIZE(simone_spi_devices)); diff --git a/arch/arm/mach-ep93xx/snappercl15.c b/arch/arm/mach-ep93xx/snappercl15.c index b2db791b3b38..eeab863b60ca 100644 --- a/arch/arm/mach-ep93xx/snappercl15.c +++ b/arch/arm/mach-ep93xx/snappercl15.c @@ -21,7 +21,6 @@ #include #include #include -#include #include #include @@ -127,15 +126,6 @@ static struct ep93xx_eth_data __initdata snappercl15_eth_data = { .phy_id = 1, }; -static struct i2c_gpio_platform_data __initdata snappercl15_i2c_gpio_data = { - .sda_pin = EP93XX_GPIO_LINE_EEDAT, - .sda_is_open_drain = 0, - .scl_pin = EP93XX_GPIO_LINE_EECLK, - .scl_is_open_drain = 0, - .udelay = 0, - .timeout = 0, -}; - static struct i2c_board_info __initdata snappercl15_i2c_data[] = { { /* Audio codec */ @@ -161,7 +151,7 @@ static void __init snappercl15_init_machine(void) { ep93xx_init_devices(); ep93xx_register_eth(&snappercl15_eth_data, 1); - ep93xx_register_i2c(&snappercl15_i2c_gpio_data, snappercl15_i2c_data, + ep93xx_register_i2c(snappercl15_i2c_data, ARRAY_SIZE(snappercl15_i2c_data)); ep93xx_register_fb(&snappercl15_fb_info); snappercl15_register_audio(); diff --git a/arch/arm/mach-ep93xx/vision_ep9307.c b/arch/arm/mach-ep93xx/vision_ep9307.c index 1daf9441058c..5a0b6187990a 100644 --- a/arch/arm/mach-ep93xx/vision_ep9307.c +++ b/arch/arm/mach-ep93xx/vision_ep9307.c @@ -22,7 +22,6 @@ #include #include #include -#include #include #include #include @@ -144,10 +143,6 @@ static struct pca953x_platform_data pca953x_77_gpio_data = { /************************************************************************* * I2C Bus *************************************************************************/ -static struct i2c_gpio_platform_data vision_i2c_gpio_data __initdata = { - .sda_pin = EP93XX_GPIO_LINE_EEDAT, - .scl_pin = EP93XX_GPIO_LINE_EECLK, -}; static struct i2c_board_info vision_i2c_info[] __initdata = { { @@ -289,7 +284,7 @@ static void __init vision_init_machine(void) vision_i2c_info[1].irq = gpio_to_irq(EP93XX_GPIO_LINE_F(7)); - ep93xx_register_i2c(&vision_i2c_gpio_data, vision_i2c_info, + ep93xx_register_i2c(vision_i2c_info, ARRAY_SIZE(vision_i2c_info)); ep93xx_register_spi(&vision_spi_master, vision_spi_board_info, ARRAY_SIZE(vision_spi_board_info)); diff --git a/arch/arm/mach-ixp4xx/avila-setup.c b/arch/arm/mach-ixp4xx/avila-setup.c index 6beec150c060..72122b5e7f28 100644 --- a/arch/arm/mach-ixp4xx/avila-setup.c +++ b/arch/arm/mach-ixp4xx/avila-setup.c @@ -17,7 +17,7 @@ #include #include #include -#include +#include #include #include #include @@ -49,16 +49,21 @@ static struct platform_device avila_flash = { .resource = &avila_flash_resource, }; -static struct i2c_gpio_platform_data avila_i2c_gpio_data = { - .sda_pin = AVILA_SDA_PIN, - .scl_pin = AVILA_SCL_PIN, +static struct gpiod_lookup_table avila_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", AVILA_SDA_PIN, + NULL, 0, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", AVILA_SCL_PIN, + NULL, 1, GPIO_ACTIVE_HIGH), + }, }; static struct platform_device avila_i2c_gpio = { .name = "i2c-gpio", .id = 0, .dev = { - .platform_data = &avila_i2c_gpio_data, + .platform_data = NULL, }, }; @@ -147,6 +152,8 @@ static void __init avila_init(void) avila_flash_resource.end = IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1; + gpiod_add_lookup_table(&avila_i2c_gpiod_table); + platform_add_devices(avila_devices, ARRAY_SIZE(avila_devices)); avila_pata_resources[0].start = IXP4XX_EXP_BUS_BASE(1); diff --git a/arch/arm/mach-ixp4xx/dsmg600-setup.c b/arch/arm/mach-ixp4xx/dsmg600-setup.c index b3bd0e137f6d..68ccd669051b 100644 --- a/arch/arm/mach-ixp4xx/dsmg600-setup.c +++ b/arch/arm/mach-ixp4xx/dsmg600-setup.c @@ -25,7 +25,7 @@ #include #include #include -#include +#include #include @@ -68,16 +68,21 @@ static struct platform_device dsmg600_flash = { .resource = &dsmg600_flash_resource, }; -static struct i2c_gpio_platform_data dsmg600_i2c_gpio_data = { - .sda_pin = DSMG600_SDA_PIN, - .scl_pin = DSMG600_SCL_PIN, +static struct gpiod_lookup_table dsmg600_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SDA_PIN, + NULL, 0, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SCL_PIN, + NULL, 1, GPIO_ACTIVE_HIGH), + }, }; static struct platform_device dsmg600_i2c_gpio = { .name = "i2c-gpio", .id = 0, .dev = { - .platform_data = &dsmg600_i2c_gpio_data, + .platform_data = NULL, }, }; @@ -269,6 +274,7 @@ static void __init dsmg600_init(void) dsmg600_flash_resource.end = IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1; + gpiod_add_lookup_table(&dsmg600_i2c_gpiod_table); i2c_register_board_info(0, dsmg600_i2c_board_info, ARRAY_SIZE(dsmg600_i2c_board_info)); diff --git a/arch/arm/mach-ixp4xx/fsg-setup.c b/arch/arm/mach-ixp4xx/fsg-setup.c index 5c4b0c4a1b37..a0350ad15175 100644 --- a/arch/arm/mach-ixp4xx/fsg-setup.c +++ b/arch/arm/mach-ixp4xx/fsg-setup.c @@ -22,7 +22,7 @@ #include #include #include -#include +#include #include #include #include @@ -54,16 +54,21 @@ static struct platform_device fsg_flash = { .resource = &fsg_flash_resource, }; -static struct i2c_gpio_platform_data fsg_i2c_gpio_data = { - .sda_pin = FSG_SDA_PIN, - .scl_pin = FSG_SCL_PIN, +static struct gpiod_lookup_table fsg_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SDA_PIN, + NULL, 0, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SCL_PIN, + NULL, 1, GPIO_ACTIVE_HIGH), + }, }; static struct platform_device fsg_i2c_gpio = { .name = "i2c-gpio", .id = 0, .dev = { - .platform_data = &fsg_i2c_gpio_data, + .platform_data = NULL, }, }; @@ -196,6 +201,7 @@ static void __init fsg_init(void) /* Configure CS2 for operation, 8bit and writable */ *IXP4XX_EXP_CS2 = 0xbfff0002; + gpiod_add_lookup_table(&fsg_i2c_gpiod_table); i2c_register_board_info(0, fsg_i2c_board_info, ARRAY_SIZE(fsg_i2c_board_info)); diff --git a/arch/arm/mach-ixp4xx/goramo_mlr.c b/arch/arm/mach-ixp4xx/goramo_mlr.c index 80bd9d6d04de..f1529aa3f8e2 100644 --- a/arch/arm/mach-ixp4xx/goramo_mlr.c +++ b/arch/arm/mach-ixp4xx/goramo_mlr.c @@ -6,7 +6,6 @@ #include #include #include -#include #include #include #include @@ -78,6 +77,12 @@ static u32 hw_bits = 0xFFFFFFFD; /* assume all hardware present */; static u8 control_value; +/* + * FIXME: this is reimplementing I2C bit-bangining. Move this + * over to using driver/i2c/busses/i2c-gpio.c like all other boards + * and register proper I2C device(s) on the bus for this. (See + * other IXP4xx boards for examples.) + */ static void set_scl(u8 value) { gpio_set_value(GPIO_SCL, !!value); @@ -216,20 +221,6 @@ static struct platform_device device_flash = { .resource = &flash_resource, }; - -/* I^2C interface */ -static struct i2c_gpio_platform_data i2c_data = { - .sda_pin = GPIO_SDA, - .scl_pin = GPIO_SCL, -}; - -static struct platform_device device_i2c = { - .name = "i2c-gpio", - .id = 0, - .dev = { .platform_data = &i2c_data }, -}; - - /* IXP425 2 UART ports */ static struct resource uart_resources[] = { { @@ -411,9 +402,6 @@ static void __init gmlr_init(void) if (hw_bits & CFG_HW_HAS_HSS1) device_tab[devices++] = &device_hss_tab[1]; /* max index 5 */ - if (hw_bits & CFG_HW_HAS_EEPROM) - device_tab[devices++] = &device_i2c; /* max index 6 */ - gpio_request(GPIO_SCL, "SCL/clock"); gpio_request(GPIO_SDA, "SDA/data"); gpio_request(GPIO_STR, "strobe"); diff --git a/arch/arm/mach-ixp4xx/ixdp425-setup.c b/arch/arm/mach-ixp4xx/ixdp425-setup.c index 508c2d7786e2..fd32ccde20c5 100644 --- a/arch/arm/mach-ixp4xx/ixdp425-setup.c +++ b/arch/arm/mach-ixp4xx/ixdp425-setup.c @@ -14,7 +14,7 @@ #include #include #include -#include +#include #include #include #include @@ -122,16 +122,21 @@ static struct platform_device ixdp425_flash_nand = { }; #endif /* CONFIG_MTD_NAND_PLATFORM */ -static struct i2c_gpio_platform_data ixdp425_i2c_gpio_data = { - .sda_pin = IXDP425_SDA_PIN, - .scl_pin = IXDP425_SCL_PIN, +static struct gpiod_lookup_table ixdp425_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", IXDP425_SDA_PIN, + NULL, 0, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", IXDP425_SCL_PIN, + NULL, 1, GPIO_ACTIVE_HIGH), + }, }; static struct platform_device ixdp425_i2c_gpio = { .name = "i2c-gpio", .id = 0, .dev = { - .platform_data = &ixdp425_i2c_gpio_data, + .platform_data = NULL, }, }; @@ -245,6 +250,7 @@ static void __init ixdp425_init(void) ixdp425_uart_data[1].flags = 0; } + gpiod_add_lookup_table(&ixdp425_i2c_gpiod_table); platform_add_devices(ixdp425_devices, ARRAY_SIZE(ixdp425_devices)); } diff --git a/arch/arm/mach-ixp4xx/nas100d-setup.c b/arch/arm/mach-ixp4xx/nas100d-setup.c index 4e0f762bc651..612ec8c63456 100644 --- a/arch/arm/mach-ixp4xx/nas100d-setup.c +++ b/arch/arm/mach-ixp4xx/nas100d-setup.c @@ -27,7 +27,7 @@ #include #include #include -#include +#include #include #include #include @@ -100,16 +100,21 @@ static struct platform_device nas100d_leds = { .dev.platform_data = &nas100d_led_data, }; -static struct i2c_gpio_platform_data nas100d_i2c_gpio_data = { - .sda_pin = NAS100D_SDA_PIN, - .scl_pin = NAS100D_SCL_PIN, +static struct gpiod_lookup_table nas100d_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SDA_PIN, + NULL, 0, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SCL_PIN, + NULL, 1, GPIO_ACTIVE_HIGH), + }, }; static struct platform_device nas100d_i2c_gpio = { .name = "i2c-gpio", .id = 0, .dev = { - .platform_data = &nas100d_i2c_gpio_data, + .platform_data = NULL, }, }; @@ -280,6 +285,7 @@ static void __init nas100d_init(void) nas100d_flash_resource.end = IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1; + gpiod_add_lookup_table(&nas100d_i2c_gpiod_table); i2c_register_board_info(0, nas100d_i2c_board_info, ARRAY_SIZE(nas100d_i2c_board_info)); diff --git a/arch/arm/mach-ixp4xx/nslu2-setup.c b/arch/arm/mach-ixp4xx/nslu2-setup.c index 88c025f52d8d..13afb03b50fa 100644 --- a/arch/arm/mach-ixp4xx/nslu2-setup.c +++ b/arch/arm/mach-ixp4xx/nslu2-setup.c @@ -24,7 +24,7 @@ #include #include #include -#include +#include #include #include #include @@ -68,9 +68,14 @@ static struct platform_device nslu2_flash = { .resource = &nslu2_flash_resource, }; -static struct i2c_gpio_platform_data nslu2_i2c_gpio_data = { - .sda_pin = NSLU2_SDA_PIN, - .scl_pin = NSLU2_SCL_PIN, +static struct gpiod_lookup_table nslu2_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SDA_PIN, + NULL, 0, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SCL_PIN, + NULL, 1, GPIO_ACTIVE_HIGH), + }, }; static struct i2c_board_info __initdata nslu2_i2c_board_info [] = { @@ -115,7 +120,7 @@ static struct platform_device nslu2_i2c_gpio = { .name = "i2c-gpio", .id = 0, .dev = { - .platform_data = &nslu2_i2c_gpio_data, + .platform_data = NULL, }, }; @@ -250,6 +255,7 @@ static void __init nslu2_init(void) nslu2_flash_resource.end = IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1; + gpiod_add_lookup_table(&nslu2_i2c_gpiod_table); i2c_register_board_info(0, nslu2_i2c_board_info, ARRAY_SIZE(nslu2_i2c_board_info)); diff --git a/arch/arm/mach-ks8695/board-acs5k.c b/arch/arm/mach-ks8695/board-acs5k.c index e4d709c8ed32..f034724e01e1 100644 --- a/arch/arm/mach-ks8695/board-acs5k.c +++ b/arch/arm/mach-ks8695/board-acs5k.c @@ -16,7 +16,7 @@ #include #include #include - +#include #include #include #include @@ -38,9 +38,15 @@ #include "generic.h" +static struct gpiod_lookup_table acs5k_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("KS8695", 4, NULL, 0, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("KS8695", 5, NULL, 1, GPIO_ACTIVE_HIGH), + }, +}; + static struct i2c_gpio_platform_data acs5k_i2c_device_platdata = { - .sda_pin = 4, - .scl_pin = 5, .udelay = 10, }; @@ -95,6 +101,7 @@ static struct i2c_board_info acs5k_i2c_devs[] __initdata = { static void acs5k_i2c_init(void) { /* The gpio interface */ + gpiod_add_lookup_table(&acs5k_i2c_gpiod_table); platform_device_register(&acs5k_i2c_device); /* I2C devices */ i2c_register_board_info(0, acs5k_i2c_devs, diff --git a/arch/arm/mach-pxa/palmz72.c b/arch/arm/mach-pxa/palmz72.c index 29630061e700..94f75632c007 100644 --- a/arch/arm/mach-pxa/palmz72.c +++ b/arch/arm/mach-pxa/palmz72.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include @@ -320,9 +321,15 @@ static struct soc_camera_link palmz72_iclink = { .flags = SOCAM_DATAWIDTH_8, }; +static struct gpiod_lookup_table palmz72_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("gpio-pxa", 118, NULL, 0, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("gpio-pxa", 117, NULL, 1, GPIO_ACTIVE_HIGH), + }, +}; + static struct i2c_gpio_platform_data palmz72_i2c_bus_data = { - .sda_pin = 118, - .scl_pin = 117, .udelay = 10, .timeout = 100, }; @@ -369,6 +376,7 @@ static void __init palmz72_camera_init(void) { palmz72_cam_gpio_init(); pxa_set_camera_info(&palmz72_pxacamera_platform_data); + gpiod_add_lookup_table(&palmz72_i2c_gpiod_table); platform_device_register(&palmz72_i2c_bus_device); platform_device_register(&palmz72_camera); } diff --git a/arch/arm/mach-pxa/viper.c b/arch/arm/mach-pxa/viper.c index 8e89d91b206b..a680742bee2b 100644 --- a/arch/arm/mach-pxa/viper.c +++ b/arch/arm/mach-pxa/viper.c @@ -36,6 +36,7 @@ #include #include #include +#include #include #include #include @@ -458,9 +459,17 @@ static struct platform_device smc91x_device = { }; /* i2c */ +static struct gpiod_lookup_table viper_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("gpio-pxa", VIPER_RTC_I2C_SDA_GPIO, + NULL, 0, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("gpio-pxa", VIPER_RTC_I2C_SCL_GPIO, + NULL, 1, GPIO_ACTIVE_HIGH), + }, +}; + static struct i2c_gpio_platform_data i2c_bus_data = { - .sda_pin = VIPER_RTC_I2C_SDA_GPIO, - .scl_pin = VIPER_RTC_I2C_SCL_GPIO, .udelay = 10, .timeout = HZ, }; @@ -779,12 +788,20 @@ static int __init viper_tpm_setup(char *str) __setup("tpm=", viper_tpm_setup); +struct gpiod_lookup_table viper_tpm_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("gpio-pxa", VIPER_TPM_I2C_SDA_GPIO, + NULL, 0, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("gpio-pxa", VIPER_TPM_I2C_SCL_GPIO, + NULL, 1, GPIO_ACTIVE_HIGH), + }, +}; + static void __init viper_tpm_init(void) { struct platform_device *tpm_device; struct i2c_gpio_platform_data i2c_tpm_data = { - .sda_pin = VIPER_TPM_I2C_SDA_GPIO, - .scl_pin = VIPER_TPM_I2C_SCL_GPIO, .udelay = 10, .timeout = HZ, }; @@ -794,6 +811,7 @@ static void __init viper_tpm_init(void) if (!viper_tpm) return; + gpiod_add_lookup_table(&viper_tpm_i2c_gpiod_table); tpm_device = platform_device_alloc("i2c-gpio", 2); if (tpm_device) { if (!platform_device_add_data(tpm_device, @@ -943,6 +961,7 @@ static void __init viper_init(void) smc91x_device.num_resources--; pxa_set_i2c_info(NULL); + gpiod_add_lookup_table(&viper_i2c_gpiod_table); pwm_add_table(viper_pwm_lookup, ARRAY_SIZE(viper_pwm_lookup)); platform_add_devices(viper_devs, ARRAY_SIZE(viper_devs)); diff --git a/arch/arm/mach-sa1100/simpad.c b/arch/arm/mach-sa1100/simpad.c index bb3ca9c763de..c6e7e6d8733a 100644 --- a/arch/arm/mach-sa1100/simpad.c +++ b/arch/arm/mach-sa1100/simpad.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -323,9 +324,15 @@ static struct platform_device simpad_gpio_leds = { /* * i2c */ +static struct gpiod_lookup_table simpad_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("gpio", GPIO_GPIO21, NULL, 0, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("gpio", GPIO_GPIO25, NULL, 1, GPIO_ACTIVE_HIGH), + }, +}; + static struct i2c_gpio_platform_data simpad_i2c_data = { - .sda_pin = GPIO_GPIO21, - .scl_pin = GPIO_GPIO25, .udelay = 10, .timeout = HZ, }; @@ -380,6 +387,7 @@ static int __init simpad_init(void) ARRAY_SIZE(simpad_flash_resources)); sa11x0_register_mcp(&simpad_mcp_data); + gpiod_add_lookup_table(&simpad_i2c_gpiod_table); ret = platform_add_devices(devices, ARRAY_SIZE(devices)); if(ret) printk(KERN_WARNING "simpad: Unable to register mq200 framebuffer device"); diff --git a/arch/blackfin/mach-bf533/boards/blackstamp.c b/arch/blackfin/mach-bf533/boards/blackstamp.c index 0ccf0cf4daaf..d801ca5ca6c4 100644 --- a/arch/blackfin/mach-bf533/boards/blackstamp.c +++ b/arch/blackfin/mach-bf533/boards/blackstamp.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -362,11 +363,17 @@ static struct platform_device bfin_device_gpiokeys = { #if IS_ENABLED(CONFIG_I2C_GPIO) #include +static struct gpiod_lookup_table bfin_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF8, NULL, 0, + GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF9, NULL, 1, + GPIO_ACTIVE_HIGH), + }, +}; + static struct i2c_gpio_platform_data i2c_gpio_data = { - .sda_pin = GPIO_PF8, - .scl_pin = GPIO_PF9, - .sda_is_open_drain = 0, - .scl_is_open_drain = 0, .udelay = 40, }; /* This hasn't actually been used these pins * are (currently) free pins on the expansion connector */ @@ -462,7 +469,9 @@ static int __init blackstamp_init(void) int ret; printk(KERN_INFO "%s(): registering device resources\n", __func__); - +#if IS_ENABLED(CONFIG_I2C_GPIO) + gpiod_add_lookup_table(&bfin_i2c_gpiod_table); +#endif i2c_register_board_info(0, bfin_i2c_board_info, ARRAY_SIZE(bfin_i2c_board_info)); diff --git a/arch/blackfin/mach-bf533/boards/ezkit.c b/arch/blackfin/mach-bf533/boards/ezkit.c index 3625e9eaa8a8..463a72358b0e 100644 --- a/arch/blackfin/mach-bf533/boards/ezkit.c +++ b/arch/blackfin/mach-bf533/boards/ezkit.c @@ -19,6 +19,7 @@ #endif #include #include +#include #include #include #include @@ -390,11 +391,17 @@ static struct platform_device bfin_device_gpiokeys = { #if IS_ENABLED(CONFIG_I2C_GPIO) #include +static struct gpiod_lookup_table bfin_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF1, NULL, 0, + GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF0, NULL, 1, + GPIO_ACTIVE_HIGH), + }, +}; + static struct i2c_gpio_platform_data i2c_gpio_data = { - .sda_pin = GPIO_PF1, - .scl_pin = GPIO_PF0, - .sda_is_open_drain = 0, - .scl_is_open_drain = 0, .udelay = 40, }; @@ -516,6 +523,9 @@ static struct platform_device *ezkit_devices[] __initdata = { static int __init ezkit_init(void) { printk(KERN_INFO "%s(): registering device resources\n", __func__); +#if IS_ENABLED(CONFIG_I2C_GPIO) + gpiod_add_lookup_table(&bfin_i2c_gpiod_table); +#endif platform_add_devices(ezkit_devices, ARRAY_SIZE(ezkit_devices)); spi_register_board_info(bfin_spi_board_info, ARRAY_SIZE(bfin_spi_board_info)); i2c_register_board_info(0, bfin_i2c_board_info, diff --git a/arch/blackfin/mach-bf533/boards/stamp.c b/arch/blackfin/mach-bf533/boards/stamp.c index 23eada79439c..d2479359adb7 100644 --- a/arch/blackfin/mach-bf533/boards/stamp.c +++ b/arch/blackfin/mach-bf533/boards/stamp.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include #include @@ -512,11 +513,17 @@ static struct platform_device bfin_device_gpiokeys = { #if IS_ENABLED(CONFIG_I2C_GPIO) #include +static struct gpiod_lookup_table bfin_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF2, NULL, 0, + GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF3, NULL, 1, + GPIO_ACTIVE_HIGH), + }, +}; + static struct i2c_gpio_platform_data i2c_gpio_data = { - .sda_pin = GPIO_PF2, - .scl_pin = GPIO_PF3, - .sda_is_open_drain = 0, - .scl_is_open_drain = 0, .udelay = 10, }; @@ -848,6 +855,9 @@ static int __init stamp_init(void) printk(KERN_INFO "%s(): registering device resources\n", __func__); +#if IS_ENABLED(CONFIG_I2C_GPIO) + gpiod_add_lookup_table(&bfin_i2c_gpiod_table); +#endif i2c_register_board_info(0, bfin_i2c_board_info, ARRAY_SIZE(bfin_i2c_board_info)); diff --git a/arch/blackfin/mach-bf561/boards/ezkit.c b/arch/blackfin/mach-bf561/boards/ezkit.c index 57d1c43726d9..72f757ebaa84 100644 --- a/arch/blackfin/mach-bf561/boards/ezkit.c +++ b/arch/blackfin/mach-bf561/boards/ezkit.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -379,11 +380,17 @@ static struct platform_device bfin_device_gpiokeys = { #if IS_ENABLED(CONFIG_I2C_GPIO) #include +static struct gpiod_lookup_table bfin_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF1, NULL, 0, + GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF0, NULL, 1, + GPIO_ACTIVE_HIGH), + }, +}; + static struct i2c_gpio_platform_data i2c_gpio_data = { - .sda_pin = GPIO_PF1, - .scl_pin = GPIO_PF0, - .sda_is_open_drain = 0, - .scl_is_open_drain = 0, .udelay = 10, }; @@ -633,6 +640,9 @@ static int __init ezkit_init(void) printk(KERN_INFO "%s(): registering device resources\n", __func__); +#if IS_ENABLED(CONFIG_I2C_GPIO) + gpiod_add_lookup_table(&bfin_i2c_gpiod_table); +#endif ret = platform_add_devices(ezkit_devices, ARRAY_SIZE(ezkit_devices)); if (ret < 0) return ret; diff --git a/arch/mips/alchemy/board-gpr.c b/arch/mips/alchemy/board-gpr.c index 6fb6b3faa158..daebc36e5ecb 100644 --- a/arch/mips/alchemy/board-gpr.c +++ b/arch/mips/alchemy/board-gpr.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #include #include @@ -218,10 +219,23 @@ static struct platform_device gpr_led_devices = { /* * I2C */ +static struct gpiod_lookup_table gpr_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + /* + * This should be on "GPIO2" which has base at 200 so + * the global numbers 209 and 210 should correspond to + * local offsets 9 and 10. + */ + GPIO_LOOKUP_IDX("alchemy-gpio2", 9, NULL, 0, + GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("alchemy-gpio2", 10, NULL, 1, + GPIO_ACTIVE_HIGH), + }, +}; + static struct i2c_gpio_platform_data gpr_i2c_data = { - .sda_pin = 209, .sda_is_open_drain = 1, - .scl_pin = 210, .scl_is_open_drain = 1, .udelay = 2, /* ~100 kHz */ .timeout = HZ, @@ -295,6 +309,7 @@ arch_initcall(gpr_pci_init); static int __init gpr_dev_init(void) { + gpiod_add_lookup_table(&gpr_i2c_gpiod_table); i2c_register_board_info(0, gpr_i2c_info, ARRAY_SIZE(gpr_i2c_info)); return platform_add_devices(gpr_devices, ARRAY_SIZE(gpr_devices)); diff --git a/arch/mips/ath79/mach-pb44.c b/arch/mips/ath79/mach-pb44.c index be78298dffb4..a95409063847 100644 --- a/arch/mips/ath79/mach-pb44.c +++ b/arch/mips/ath79/mach-pb44.c @@ -11,7 +11,7 @@ #include #include #include -#include +#include #include #include "machtypes.h" @@ -33,16 +33,21 @@ #define PB44_KEYS_POLL_INTERVAL 20 /* msecs */ #define PB44_KEYS_DEBOUNCE_INTERVAL (3 * PB44_KEYS_POLL_INTERVAL) -static struct i2c_gpio_platform_data pb44_i2c_gpio_data = { - .sda_pin = PB44_GPIO_I2C_SDA, - .scl_pin = PB44_GPIO_I2C_SCL, +static struct gpiod_lookup_table pb44_i2c_gpiod_table = { + .dev_id = "i2c-gpio", + .table = { + GPIO_LOOKUP_IDX("ath79-gpio", PB44_GPIO_I2C_SDA, + NULL, 0, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("ath79-gpio", PB44_GPIO_I2C_SCL, + NULL, 1, GPIO_ACTIVE_HIGH), + }, }; static struct platform_device pb44_i2c_gpio_device = { .name = "i2c-gpio", .id = 0, .dev = { - .platform_data = &pb44_i2c_gpio_data, + .platform_data = NULL, } }; @@ -103,6 +108,7 @@ static struct ath79_spi_platform_data pb44_spi_data = { static void __init pb44_init(void) { + gpiod_add_lookup_table(&pb44_i2c_gpiod_table); i2c_register_board_info(0, pb44_i2c_board_info, ARRAY_SIZE(pb44_i2c_board_info)); platform_device_register(&pb44_i2c_gpio_device); diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c index 34cfc0ebdcb9..b4664037eded 100644 --- a/drivers/i2c/busses/i2c-gpio.c +++ b/drivers/i2c/busses/i2c-gpio.c @@ -14,11 +14,12 @@ #include #include #include -#include +#include #include -#include struct i2c_gpio_private_data { + struct gpio_desc *sda; + struct gpio_desc *scl; struct i2c_adapter adap; struct i2c_algo_bit_data bit_data; struct i2c_gpio_platform_data pdata; @@ -27,12 +28,18 @@ struct i2c_gpio_private_data { /* Toggle SDA by changing the direction of the pin */ static void i2c_gpio_setsda_dir(void *data, int state) { - struct i2c_gpio_platform_data *pdata = data; - + struct i2c_gpio_private_data *priv = data; + + /* + * This is a way of saying "do not drive + * me actively high" which means emulating open drain. + * The right way to do this is for gpiolib to + * handle this, by the function below. + */ if (state) - gpio_direction_input(pdata->sda_pin); + gpiod_direction_input(priv->sda); else - gpio_direction_output(pdata->sda_pin, 0); + gpiod_direction_output(priv->sda, 0); } /* @@ -42,20 +49,20 @@ static void i2c_gpio_setsda_dir(void *data, int state) */ static void i2c_gpio_setsda_val(void *data, int state) { - struct i2c_gpio_platform_data *pdata = data; + struct i2c_gpio_private_data *priv = data; - gpio_set_value(pdata->sda_pin, state); + gpiod_set_value(priv->sda, state); } /* Toggle SCL by changing the direction of the pin. */ static void i2c_gpio_setscl_dir(void *data, int state) { - struct i2c_gpio_platform_data *pdata = data; + struct i2c_gpio_private_data *priv = data; if (state) - gpio_direction_input(pdata->scl_pin); + gpiod_direction_input(priv->scl); else - gpio_direction_output(pdata->scl_pin, 0); + gpiod_direction_output(priv->scl, 0); } /* @@ -66,44 +73,23 @@ static void i2c_gpio_setscl_dir(void *data, int state) */ static void i2c_gpio_setscl_val(void *data, int state) { - struct i2c_gpio_platform_data *pdata = data; + struct i2c_gpio_private_data *priv = data; - gpio_set_value(pdata->scl_pin, state); + gpiod_set_value(priv->scl, state); } static int i2c_gpio_getsda(void *data) { - struct i2c_gpio_platform_data *pdata = data; + struct i2c_gpio_private_data *priv = data; - return gpio_get_value(pdata->sda_pin); + return gpiod_get_value(priv->sda); } static int i2c_gpio_getscl(void *data) { - struct i2c_gpio_platform_data *pdata = data; + struct i2c_gpio_private_data *priv = data; - return gpio_get_value(pdata->scl_pin); -} - -static int of_i2c_gpio_get_pins(struct device_node *np, - unsigned int *sda_pin, unsigned int *scl_pin) -{ - if (of_gpio_count(np) < 2) - return -ENODEV; - - *sda_pin = of_get_gpio(np, 0); - *scl_pin = of_get_gpio(np, 1); - - if (*sda_pin == -EPROBE_DEFER || *scl_pin == -EPROBE_DEFER) - return -EPROBE_DEFER; - - if (!gpio_is_valid(*sda_pin) || !gpio_is_valid(*scl_pin)) { - pr_err("%s: invalid GPIO pins, sda=%d/scl=%d\n", - np->full_name, *sda_pin, *scl_pin); - return -ENODEV; - } - - return 0; + return gpiod_get_value(priv->scl); } static void of_i2c_gpio_get_props(struct device_node *np, @@ -130,64 +116,65 @@ static int i2c_gpio_probe(struct platform_device *pdev) struct i2c_gpio_platform_data *pdata; struct i2c_algo_bit_data *bit_data; struct i2c_adapter *adap; - unsigned int sda_pin, scl_pin; int ret; - /* First get the GPIO pins; if it fails, we'll defer the probe. */ - if (pdev->dev.of_node) { - ret = of_i2c_gpio_get_pins(pdev->dev.of_node, - &sda_pin, &scl_pin); - if (ret) - return ret; - } else { - if (!dev_get_platdata(&pdev->dev)) - return -ENXIO; - pdata = dev_get_platdata(&pdev->dev); - sda_pin = pdata->sda_pin; - scl_pin = pdata->scl_pin; - } + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; - ret = devm_gpio_request(&pdev->dev, sda_pin, "sda"); - if (ret) { + /* First get the GPIO pins; if it fails, we'll defer the probe. */ + priv->sda = devm_gpiod_get_index(&pdev->dev, NULL, 0, GPIOD_OUT_HIGH); + if (IS_ERR(priv->sda)) { + ret = PTR_ERR(priv->sda); + /* FIXME: hack in the old code, is this really necessary? */ if (ret == -EINVAL) - ret = -EPROBE_DEFER; /* Try again later */ + ret = -EPROBE_DEFER; return ret; } - ret = devm_gpio_request(&pdev->dev, scl_pin, "scl"); - if (ret) { + priv->scl = devm_gpiod_get_index(&pdev->dev, NULL, 1, GPIOD_OUT_LOW); + if (IS_ERR(priv->scl)) { + ret = PTR_ERR(priv->scl); + /* FIXME: hack in the old code, is this really necessary? */ if (ret == -EINVAL) - ret = -EPROBE_DEFER; /* Try again later */ + ret = -EPROBE_DEFER; return ret; } - priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); - if (!priv) - return -ENOMEM; adap = &priv->adap; bit_data = &priv->bit_data; pdata = &priv->pdata; if (pdev->dev.of_node) { - pdata->sda_pin = sda_pin; - pdata->scl_pin = scl_pin; of_i2c_gpio_get_props(pdev->dev.of_node, pdata); } else { - memcpy(pdata, dev_get_platdata(&pdev->dev), sizeof(*pdata)); + /* + * If all platform data settings are zero it is OK + * to not provide any platform data from the board. + */ + if (dev_get_platdata(&pdev->dev)) + memcpy(pdata, dev_get_platdata(&pdev->dev), + sizeof(*pdata)); } + /* + * FIXME: this is a hack emulating the open drain emulation + * that gpiolib can already do for us. Make all clients properly + * flag their lines as open drain and get rid of this property + * and the special callback. + */ if (pdata->sda_is_open_drain) { - gpio_direction_output(pdata->sda_pin, 1); + gpiod_direction_output(priv->sda, 1); bit_data->setsda = i2c_gpio_setsda_val; } else { - gpio_direction_input(pdata->sda_pin); + gpiod_direction_input(priv->sda); bit_data->setsda = i2c_gpio_setsda_dir; } if (pdata->scl_is_open_drain || pdata->scl_is_output_only) { - gpio_direction_output(pdata->scl_pin, 1); + gpiod_direction_output(priv->scl, 1); bit_data->setscl = i2c_gpio_setscl_val; } else { - gpio_direction_input(pdata->scl_pin); + gpiod_direction_input(priv->scl); bit_data->setscl = i2c_gpio_setscl_dir; } @@ -207,7 +194,7 @@ static int i2c_gpio_probe(struct platform_device *pdev) else bit_data->timeout = HZ / 10; /* 100 ms */ - bit_data->data = pdata; + bit_data->data = priv; adap->owner = THIS_MODULE; if (pdev->dev.of_node) @@ -227,8 +214,13 @@ static int i2c_gpio_probe(struct platform_device *pdev) platform_set_drvdata(pdev, priv); - dev_info(&pdev->dev, "using pins %u (SDA) and %u (SCL%s)\n", - pdata->sda_pin, pdata->scl_pin, + /* + * FIXME: using global GPIO numbers is not helpful. If/when we + * get accessors to get the actual name of the GPIO line, + * from the descriptor, then provide that instead. + */ + dev_info(&pdev->dev, "using lines %u (SDA) and %u (SCL%s)\n", + desc_to_gpio(priv->sda), desc_to_gpio(priv->scl), pdata->scl_is_output_only ? ", no clock stretching" : ""); diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c index 40534352e574..4d40d013a412 100644 --- a/drivers/mfd/sm501.c +++ b/drivers/mfd/sm501.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -1107,14 +1108,6 @@ static void sm501_gpio_remove(struct sm501_devdata *sm) kfree(gpio->regs_res); } -static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin) -{ - struct sm501_gpio *gpio = &sm->gpio; - int base = (pin < 32) ? gpio->low.gpio.base : gpio->high.gpio.base; - - return (pin % 32) + base; -} - static inline int sm501_gpio_isregistered(struct sm501_devdata *sm) { return sm->gpio.registered; @@ -1129,11 +1122,6 @@ static inline void sm501_gpio_remove(struct sm501_devdata *sm) { } -static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin) -{ - return -1; -} - static inline int sm501_gpio_isregistered(struct sm501_devdata *sm) { return 0; @@ -1145,20 +1133,37 @@ static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm, { struct i2c_gpio_platform_data *icd; struct platform_device *pdev; + struct gpiod_lookup_table *lookup; pdev = sm501_create_subdev(sm, "i2c-gpio", 0, sizeof(struct i2c_gpio_platform_data)); if (!pdev) return -ENOMEM; - icd = dev_get_platdata(&pdev->dev); - - /* We keep the pin_sda and pin_scl fields relative in case the - * same platform data is passed to >1 SM501. - */ + /* Create a gpiod lookup using gpiochip-local offsets */ + lookup = devm_kzalloc(&pdev->dev, + sizeof(*lookup) + 3 * sizeof(struct gpiod_lookup), + GFP_KERNEL); + lookup->dev_id = "i2c-gpio"; + if (iic->pin_sda < 32) + lookup->table[0].chip_label = "SM501-LOW"; + else + lookup->table[0].chip_label = "SM501-HIGH"; + lookup->table[0].chip_hwnum = iic->pin_sda % 32; + lookup->table[0].con_id = NULL; + lookup->table[0].idx = 0; + lookup->table[0].flags = GPIO_ACTIVE_HIGH; + if (iic->pin_scl < 32) + lookup->table[1].chip_label = "SM501-LOW"; + else + lookup->table[1].chip_label = "SM501-HIGH"; + lookup->table[1].chip_hwnum = iic->pin_scl % 32; + lookup->table[1].con_id = NULL; + lookup->table[1].idx = 1; + lookup->table[1].flags = GPIO_ACTIVE_HIGH; + gpiod_add_lookup_table(lookup); - icd->sda_pin = sm501_gpio_pin2nr(sm, iic->pin_sda); - icd->scl_pin = sm501_gpio_pin2nr(sm, iic->pin_scl); + icd = dev_get_platdata(&pdev->dev); icd->timeout = iic->timeout; icd->udelay = iic->udelay; @@ -1170,9 +1175,9 @@ static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm, pdev->id = iic->bus_num; - dev_info(sm->dev, "registering i2c-%d: sda=%d (%d), scl=%d (%d)\n", + dev_info(sm->dev, "registering i2c-%d: sda=%d, scl=%d\n", iic->bus_num, - icd->sda_pin, iic->pin_sda, icd->scl_pin, iic->pin_scl); + iic->pin_sda, iic->pin_scl); return sm501_register_device(sm, pdev); } diff --git a/include/linux/i2c-gpio.h b/include/linux/i2c-gpio.h index c1bcb1f1d73b..352c1426fd4d 100644 --- a/include/linux/i2c-gpio.h +++ b/include/linux/i2c-gpio.h @@ -12,8 +12,6 @@ /** * struct i2c_gpio_platform_data - Platform-dependent data for i2c-gpio - * @sda_pin: GPIO pin ID to use for SDA - * @scl_pin: GPIO pin ID to use for SCL * @udelay: signal toggle delay. SCL frequency is (500 / udelay) kHz * @timeout: clock stretching timeout in jiffies. If the slave keeps * SCL low for longer than this, the transfer will time out. @@ -26,8 +24,6 @@ * @scl_is_output_only: SCL output drivers cannot be turned off. */ struct i2c_gpio_platform_data { - unsigned int sda_pin; - unsigned int scl_pin; int udelay; int timeout; unsigned int sda_is_open_drain:1; From patchwork Sun Sep 17 09:39:02 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 112825 Delivered-To: patch@linaro.org Received: by 10.140.106.117 with SMTP id d108csp2503463qgf; Sun, 17 Sep 2017 02:39:30 -0700 (PDT) X-Received: by 10.159.198.7 with SMTP id f7mr11094218plo.38.1505641170335; Sun, 17 Sep 2017 02:39:30 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1505641170; cv=none; d=google.com; s=arc-20160816; b=CheJpB9MDbACAyCc85Uu20UcsqsRd60OG6cSJV+E9JPp2fu94BGu7udP3HSVixQYqK NIzLv6t8Vaubpqrs1n5HODS8bw7HLMI564v1xy5Ch92mmBSm2SrryP0NOaRgICsMxPl/ /pN5x9pLJnWDeARsat4sUajc3f6JD2FMlaCb2AlWh3KvKWP2Rmh2dqVjFQWo2UxalqeT QaVBPfA/gp8WB32AMoUcasOxwIKEUsv1qh4e9E03u5TDL1O4uhbYD8voOJMqBSVC654c /ndhmN5+PlTrHkzrsrF9I5yS9NVI8m/Qhd+3MtW42ZYj/AtdzhxKHkVo85eomu+yNW0E Btfg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature:arc-authentication-results; bh=sMEO26rO/HVCUOd9MrbeOMiq+/TQB6bwmfsePMgFblE=; b=ZGqdzZftOckXleNf0fV+DrFdaWQUEfJRUqnxNi3VVsU1hdXTH8NP6JwvMB/Pe5JrvH wbObE/GvlzbDtySFcNTd1wiprpMcLdZZ+vr9F/oYJ5F59lEtQ/lSEhyOVU0mGTKldfyn FNH1cLOj06KMBLcXehKVyT7OfV3tDCi/rHLsz64XzbDUK3rj9SFT0MGT33YsSfcnCZXw vkGXwVbE7/W3p6A/NPubjCUVMp+3TROc9JDM2PZdgnV3d2AWns1E1zozTunBwgriUQ2E kjPF7/FThTW/VU1qIpvESLIt06kyCr0Vc+y7eMn2r33fhy3hdupjXD18iHGF9ycPxpQW 6TYA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=SRGZkUh+; spf=pass (google.com: best guess record for domain of linux-i2c-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-i2c-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. 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[85.224.9.34]) by smtp.gmail.com with ESMTPSA id t84sm974559lfi.21.2017.09.17.02.39.25 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 17 Sep 2017 02:39:25 -0700 (PDT) From: Linus Walleij To: Wolfram Sang , linux-i2c@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-mips@linux-mips.org, adi-buildroot-devel@lists.sourceforge.net, Geert Uytterhoeven , Linus Walleij Subject: [PATCH 3/7] i2c: gpio: Enforce open drain through gpiolib Date: Sun, 17 Sep 2017 11:39:02 +0200 Message-Id: <20170917093906.16325-4-linus.walleij@linaro.org> X-Mailer: git-send-email 2.13.5 In-Reply-To: <20170917093906.16325-1-linus.walleij@linaro.org> References: <20170917093906.16325-1-linus.walleij@linaro.org> Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org The I2C GPIO bitbang driver currently emulates open drain behaviour by implementing what the gpiolib already does: not actively driving the line high, instead setting it to input. This makes no sense. Use the new facility in gpiolib to request the lines enforced into open drain mode, and let the open drain emulation already present in the gpiolib kick in and handle this. As a bonus: if the GPIO driver in the back-end actually supports open drain in hardware using the .set_config() callback, it will be utilized. That's correct: we never used that hardware feature before, instead relying on emulating open drain even if the GPIO controller could actually handle this for us. Users will sometimes get messages like this: gpio-485 (?): enforced open drain please flag it properly in DT/ACPI DSDT/board file gpio-486 (?): enforced open drain please flag it properly in DT/ACPI DSDT/board file i2c-gpio gpio-i2c: using lines 485 (SDA) and 486 (SCL) Which is completely proper: since the line is used as open drain, it should actually be flagged properly with e.g. gpios = <&gpio0 5 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>, <&gpio0 6 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>; Or similar facilities in board file descriptor tables or ACPI DSDT. Signed-off-by: Linus Walleij --- ChangeLog v1->v2: - Fix a minor typo in error path (copy-paste scl was sda) --- drivers/i2c/busses/i2c-gpio.c | 102 ++++++++++++++++-------------------------- 1 file changed, 39 insertions(+), 63 deletions(-) -- 2.13.5 diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c index b4664037eded..97b9c29e9429 100644 --- a/drivers/i2c/busses/i2c-gpio.c +++ b/drivers/i2c/busses/i2c-gpio.c @@ -25,23 +25,6 @@ struct i2c_gpio_private_data { struct i2c_gpio_platform_data pdata; }; -/* Toggle SDA by changing the direction of the pin */ -static void i2c_gpio_setsda_dir(void *data, int state) -{ - struct i2c_gpio_private_data *priv = data; - - /* - * This is a way of saying "do not drive - * me actively high" which means emulating open drain. - * The right way to do this is for gpiolib to - * handle this, by the function below. - */ - if (state) - gpiod_direction_input(priv->sda); - else - gpiod_direction_output(priv->sda, 0); -} - /* * Toggle SDA by changing the output value of the pin. This is only * valid for pins configured as open drain (i.e. setting the value @@ -54,17 +37,6 @@ static void i2c_gpio_setsda_val(void *data, int state) gpiod_set_value(priv->sda, state); } -/* Toggle SCL by changing the direction of the pin. */ -static void i2c_gpio_setscl_dir(void *data, int state) -{ - struct i2c_gpio_private_data *priv = data; - - if (state) - gpiod_direction_input(priv->scl); - else - gpiod_direction_output(priv->scl, 0); -} - /* * Toggle SCL by changing the output value of the pin. This is used * for pins that are configured as open drain and for output-only @@ -116,30 +88,13 @@ static int i2c_gpio_probe(struct platform_device *pdev) struct i2c_gpio_platform_data *pdata; struct i2c_algo_bit_data *bit_data; struct i2c_adapter *adap; + enum gpiod_flags gflags; int ret; priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; - /* First get the GPIO pins; if it fails, we'll defer the probe. */ - priv->sda = devm_gpiod_get_index(&pdev->dev, NULL, 0, GPIOD_OUT_HIGH); - if (IS_ERR(priv->sda)) { - ret = PTR_ERR(priv->sda); - /* FIXME: hack in the old code, is this really necessary? */ - if (ret == -EINVAL) - ret = -EPROBE_DEFER; - return ret; - } - priv->scl = devm_gpiod_get_index(&pdev->dev, NULL, 1, GPIOD_OUT_LOW); - if (IS_ERR(priv->scl)) { - ret = PTR_ERR(priv->scl); - /* FIXME: hack in the old code, is this really necessary? */ - if (ret == -EINVAL) - ret = -EPROBE_DEFER; - return ret; - } - adap = &priv->adap; bit_data = &priv->bit_data; pdata = &priv->pdata; @@ -157,27 +112,48 @@ static int i2c_gpio_probe(struct platform_device *pdev) } /* - * FIXME: this is a hack emulating the open drain emulation - * that gpiolib can already do for us. Make all clients properly - * flag their lines as open drain and get rid of this property - * and the special callback. + * First get the GPIO pins; if it fails, we'll defer the probe. + * If the SDA line is marked from platform data or device tree as + * "open drain" it means something outside of our control is making + * this line being handled as open drain, and we should just handle + * it as any other output. Else we enforce open drain as this is + * required for an I2C bus. */ - if (pdata->sda_is_open_drain) { - gpiod_direction_output(priv->sda, 1); - bit_data->setsda = i2c_gpio_setsda_val; - } else { - gpiod_direction_input(priv->sda); - bit_data->setsda = i2c_gpio_setsda_dir; + if (pdata->sda_is_open_drain) + gflags = GPIOD_OUT_HIGH; + else + gflags = GPIOD_OUT_HIGH_OPEN_DRAIN; + priv->sda = devm_gpiod_get_index(&pdev->dev, NULL, 0, gflags); + if (IS_ERR(priv->sda)) { + ret = PTR_ERR(priv->sda); + /* FIXME: hack in the old code, is this really necessary? */ + if (ret == -EINVAL) + ret = -EPROBE_DEFER; + return ret; } - - if (pdata->scl_is_open_drain || pdata->scl_is_output_only) { - gpiod_direction_output(priv->scl, 1); - bit_data->setscl = i2c_gpio_setscl_val; - } else { - gpiod_direction_input(priv->scl); - bit_data->setscl = i2c_gpio_setscl_dir; + /* + * If the SCL line is marked from platform data or device tree as + * "open drain" it means something outside of our control is making + * this line being handled as open drain, and we should just handle + * it as any other output. Else we enforce open drain as this is + * required for an I2C bus. + */ + if (pdata->scl_is_open_drain) + gflags = GPIOD_OUT_LOW; + else + gflags = GPIOD_OUT_LOW_OPEN_DRAIN; + priv->scl = devm_gpiod_get_index(&pdev->dev, NULL, 1, gflags); + if (IS_ERR(priv->scl)) { + ret = PTR_ERR(priv->scl); + /* FIXME: hack in the old code, is this really necessary? */ + if (ret == -EINVAL) + ret = -EPROBE_DEFER; + return ret; } + bit_data->setsda = i2c_gpio_setsda_val; + bit_data->setscl = i2c_gpio_setscl_val; + if (!pdata->scl_is_output_only) bit_data->getscl = i2c_gpio_getscl; bit_data->getsda = i2c_gpio_getsda; From patchwork Sun Sep 17 09:39:03 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 112826 Delivered-To: patch@linaro.org Received: by 10.140.106.117 with SMTP id d108csp2503491qgf; Sun, 17 Sep 2017 02:39:32 -0700 (PDT) X-Received: by 10.84.211.6 with SMTP id b6mr19828907pli.292.1505641172501; Sun, 17 Sep 2017 02:39:32 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1505641172; cv=none; d=google.com; s=arc-20160816; b=G4O4cFTb0o4oPWoIuczWxkmYswN1zyFQs8s8p1ygg2Fp2Q9ioMQ06bqZXUh/VXgKIk 47PqQdIwdwLcMdzqHG2uLFCi1emCTihOdBbv89TT/qUftrNlVGaJrSLyKwLY3Oe93KH3 SVlPTqj5wg94fR7HAaXTrFm5dFMc6rrCVODwMQkS/mYsCw8VUqfa6GmpEQjOvE4bXubB Uw9t0PIJr5ienZUIDSwASj4Ci1c3AmXNIykW7KxZN9TBShEFgAwPpfB59WhaY1wA0BJX 2qfIoFW7nCGIRlb9ZrtGq2dDMV6r2XFMnzuQSYtWAc8Txm6d0y/3sysvGdKhm2ykDrH2 fCvQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature:arc-authentication-results; bh=z/uASDx3HajKok6qqeFCaNszgtF1owV59jX33hDibig=; b=gA0B4gGQsWYTcsjIBLjbQaGyMHxFMX8Pjx61ncgby3mlTOfgJB4A7kQvMheQQ1KJLU wuITZjVFBgaJVfqkfMyebUuTPUkArLMBU5OT3NPFfi9XhD04v/UUnRcpxC4uYGuZ63fx 5dW9q00lWZkaxMdgJAk6Sor7Y17rASdcq6VWF0/32R4D3rNc0kTdyqrpbzyJLK4pY/XF MlNk0X9UdN+TS4K5dLuqVWnCNPTE0jAEu4Wl/oRNe+z4FIPWnHBb7ld+lXP3KgVmtpOb mXpMEzRbRTghgaOIjQ5APDJ+v5IoONqwiGqhtR41tqJy2BQtuUU7tOmj81DigpVfGrwf PALw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=atFgsTxx; spf=pass (google.com: best guess record for domain of linux-i2c-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-i2c-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. 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[85.224.9.34]) by smtp.gmail.com with ESMTPSA id t84sm974559lfi.21.2017.09.17.02.39.27 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 17 Sep 2017 02:39:28 -0700 (PDT) From: Linus Walleij To: Wolfram Sang , linux-i2c@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-mips@linux-mips.org, adi-buildroot-devel@lists.sourceforge.net, Geert Uytterhoeven , Linus Walleij , Steven Miao , Ralf Baechle Subject: [PATCH 4/7] i2c: gpio: Augment all boardfiles to use open drain Date: Sun, 17 Sep 2017 11:39:03 +0200 Message-Id: <20170917093906.16325-5-linus.walleij@linaro.org> X-Mailer: git-send-email 2.13.5 In-Reply-To: <20170917093906.16325-1-linus.walleij@linaro.org> References: <20170917093906.16325-1-linus.walleij@linaro.org> Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org We now handle the open drain mode internally in the I2C GPIO driver, but we will get warnings from the gpiolib that we override the default mode of the line so it becomes open drain. We can fix all in-kernel users by simply passing the right flag along in the descriptor table, and we already touched all of these files in the series so let's just tidy it up. Cc: Steven Miao Cc: Ralf Baechle Acked-by: Olof Johansson Acked-by: Lee Jones Signed-off-by: Linus Walleij --- ChangeLog v1->v2: - Collected ACKs. Steven (Blackfin): requesting ACK for Wolfram to take this patch. Ralf (MIPS): requesting ACK for Wolfram to take this patch. --- arch/arm/mach-ep93xx/core.c | 6 ++++-- arch/arm/mach-ixp4xx/avila-setup.c | 4 ++-- arch/arm/mach-ixp4xx/dsmg600-setup.c | 4 ++-- arch/arm/mach-ixp4xx/fsg-setup.c | 4 ++-- arch/arm/mach-ixp4xx/ixdp425-setup.c | 4 ++-- arch/arm/mach-ixp4xx/nas100d-setup.c | 4 ++-- arch/arm/mach-ixp4xx/nslu2-setup.c | 4 ++-- arch/arm/mach-ks8695/board-acs5k.c | 6 ++++-- arch/arm/mach-pxa/palmz72.c | 6 ++++-- arch/arm/mach-pxa/viper.c | 8 ++++---- arch/arm/mach-sa1100/simpad.c | 6 ++++-- arch/blackfin/mach-bf533/boards/blackstamp.c | 4 ++-- arch/blackfin/mach-bf533/boards/ezkit.c | 4 ++-- arch/blackfin/mach-bf533/boards/stamp.c | 4 ++-- arch/blackfin/mach-bf561/boards/ezkit.c | 4 ++-- arch/mips/alchemy/board-gpr.c | 4 ++++ arch/mips/ath79/mach-pb44.c | 4 ++-- drivers/mfd/sm501.c | 4 ++-- 18 files changed, 48 insertions(+), 36 deletions(-) -- 2.13.5 Acked-by: Robert Jarzmik Acked-by: Ralf Baechle Acked-by: Ralf Baechle diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c index 6b4754ecaffc..efddea867cbe 100644 --- a/arch/arm/mach-ep93xx/core.c +++ b/arch/arm/mach-ep93xx/core.c @@ -326,8 +326,10 @@ static struct gpiod_lookup_table ep93xx_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { /* Use local offsets on gpiochip/port "G" */ - GPIO_LOOKUP_IDX("G", 1, NULL, 0, GPIO_ACTIVE_HIGH), - GPIO_LOOKUP_IDX("G", 0, NULL, 1, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("G", 1, NULL, 0, + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), + GPIO_LOOKUP_IDX("G", 0, NULL, 1, + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/arm/mach-ixp4xx/avila-setup.c b/arch/arm/mach-ixp4xx/avila-setup.c index 72122b5e7f28..bb6fbfc9b11a 100644 --- a/arch/arm/mach-ixp4xx/avila-setup.c +++ b/arch/arm/mach-ixp4xx/avila-setup.c @@ -53,9 +53,9 @@ static struct gpiod_lookup_table avila_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", AVILA_SDA_PIN, - NULL, 0, GPIO_ACTIVE_HIGH), + NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", AVILA_SCL_PIN, - NULL, 1, GPIO_ACTIVE_HIGH), + NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/arm/mach-ixp4xx/dsmg600-setup.c b/arch/arm/mach-ixp4xx/dsmg600-setup.c index 68ccd669051b..af543dd3da5d 100644 --- a/arch/arm/mach-ixp4xx/dsmg600-setup.c +++ b/arch/arm/mach-ixp4xx/dsmg600-setup.c @@ -72,9 +72,9 @@ static struct gpiod_lookup_table dsmg600_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SDA_PIN, - NULL, 0, GPIO_ACTIVE_HIGH), + NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SCL_PIN, - NULL, 1, GPIO_ACTIVE_HIGH), + NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/arm/mach-ixp4xx/fsg-setup.c b/arch/arm/mach-ixp4xx/fsg-setup.c index a0350ad15175..8afb3f4db376 100644 --- a/arch/arm/mach-ixp4xx/fsg-setup.c +++ b/arch/arm/mach-ixp4xx/fsg-setup.c @@ -58,9 +58,9 @@ static struct gpiod_lookup_table fsg_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SDA_PIN, - NULL, 0, GPIO_ACTIVE_HIGH), + NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SCL_PIN, - NULL, 1, GPIO_ACTIVE_HIGH), + NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/arm/mach-ixp4xx/ixdp425-setup.c b/arch/arm/mach-ixp4xx/ixdp425-setup.c index fd32ccde20c5..483d48bf252e 100644 --- a/arch/arm/mach-ixp4xx/ixdp425-setup.c +++ b/arch/arm/mach-ixp4xx/ixdp425-setup.c @@ -126,9 +126,9 @@ static struct gpiod_lookup_table ixdp425_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", IXDP425_SDA_PIN, - NULL, 0, GPIO_ACTIVE_HIGH), + NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", IXDP425_SCL_PIN, - NULL, 1, GPIO_ACTIVE_HIGH), + NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/arm/mach-ixp4xx/nas100d-setup.c b/arch/arm/mach-ixp4xx/nas100d-setup.c index 612ec8c63456..7e59c59c96a3 100644 --- a/arch/arm/mach-ixp4xx/nas100d-setup.c +++ b/arch/arm/mach-ixp4xx/nas100d-setup.c @@ -104,9 +104,9 @@ static struct gpiod_lookup_table nas100d_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SDA_PIN, - NULL, 0, GPIO_ACTIVE_HIGH), + NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SCL_PIN, - NULL, 1, GPIO_ACTIVE_HIGH), + NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/arm/mach-ixp4xx/nslu2-setup.c b/arch/arm/mach-ixp4xx/nslu2-setup.c index 13afb03b50fa..224717eb8ac2 100644 --- a/arch/arm/mach-ixp4xx/nslu2-setup.c +++ b/arch/arm/mach-ixp4xx/nslu2-setup.c @@ -72,9 +72,9 @@ static struct gpiod_lookup_table nslu2_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SDA_PIN, - NULL, 0, GPIO_ACTIVE_HIGH), + NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SCL_PIN, - NULL, 1, GPIO_ACTIVE_HIGH), + NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/arm/mach-ks8695/board-acs5k.c b/arch/arm/mach-ks8695/board-acs5k.c index f034724e01e1..937eb1d47e7b 100644 --- a/arch/arm/mach-ks8695/board-acs5k.c +++ b/arch/arm/mach-ks8695/board-acs5k.c @@ -41,8 +41,10 @@ static struct gpiod_lookup_table acs5k_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { - GPIO_LOOKUP_IDX("KS8695", 4, NULL, 0, GPIO_ACTIVE_HIGH), - GPIO_LOOKUP_IDX("KS8695", 5, NULL, 1, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("KS8695", 4, NULL, 0, + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), + GPIO_LOOKUP_IDX("KS8695", 5, NULL, 1, + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/arm/mach-pxa/palmz72.c b/arch/arm/mach-pxa/palmz72.c index 94f75632c007..5877e547cecd 100644 --- a/arch/arm/mach-pxa/palmz72.c +++ b/arch/arm/mach-pxa/palmz72.c @@ -324,8 +324,10 @@ static struct soc_camera_link palmz72_iclink = { static struct gpiod_lookup_table palmz72_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { - GPIO_LOOKUP_IDX("gpio-pxa", 118, NULL, 0, GPIO_ACTIVE_HIGH), - GPIO_LOOKUP_IDX("gpio-pxa", 117, NULL, 1, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("gpio-pxa", 118, NULL, 0, + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), + GPIO_LOOKUP_IDX("gpio-pxa", 117, NULL, 1, + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/arm/mach-pxa/viper.c b/arch/arm/mach-pxa/viper.c index a680742bee2b..4185e7ff073f 100644 --- a/arch/arm/mach-pxa/viper.c +++ b/arch/arm/mach-pxa/viper.c @@ -463,9 +463,9 @@ static struct gpiod_lookup_table viper_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { GPIO_LOOKUP_IDX("gpio-pxa", VIPER_RTC_I2C_SDA_GPIO, - NULL, 0, GPIO_ACTIVE_HIGH), + NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), GPIO_LOOKUP_IDX("gpio-pxa", VIPER_RTC_I2C_SCL_GPIO, - NULL, 1, GPIO_ACTIVE_HIGH), + NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; @@ -792,9 +792,9 @@ struct gpiod_lookup_table viper_tpm_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { GPIO_LOOKUP_IDX("gpio-pxa", VIPER_TPM_I2C_SDA_GPIO, - NULL, 0, GPIO_ACTIVE_HIGH), + NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), GPIO_LOOKUP_IDX("gpio-pxa", VIPER_TPM_I2C_SCL_GPIO, - NULL, 1, GPIO_ACTIVE_HIGH), + NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/arm/mach-sa1100/simpad.c b/arch/arm/mach-sa1100/simpad.c index c6e7e6d8733a..91526024964b 100644 --- a/arch/arm/mach-sa1100/simpad.c +++ b/arch/arm/mach-sa1100/simpad.c @@ -327,8 +327,10 @@ static struct platform_device simpad_gpio_leds = { static struct gpiod_lookup_table simpad_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { - GPIO_LOOKUP_IDX("gpio", GPIO_GPIO21, NULL, 0, GPIO_ACTIVE_HIGH), - GPIO_LOOKUP_IDX("gpio", GPIO_GPIO25, NULL, 1, GPIO_ACTIVE_HIGH), + GPIO_LOOKUP_IDX("gpio", GPIO_GPIO21, NULL, 0, + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), + GPIO_LOOKUP_IDX("gpio", GPIO_GPIO25, NULL, 1, + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/blackfin/mach-bf533/boards/blackstamp.c b/arch/blackfin/mach-bf533/boards/blackstamp.c index d801ca5ca6c4..fab69c736515 100644 --- a/arch/blackfin/mach-bf533/boards/blackstamp.c +++ b/arch/blackfin/mach-bf533/boards/blackstamp.c @@ -367,9 +367,9 @@ static struct gpiod_lookup_table bfin_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF8, NULL, 0, - GPIO_ACTIVE_HIGH), + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF9, NULL, 1, - GPIO_ACTIVE_HIGH), + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/blackfin/mach-bf533/boards/ezkit.c b/arch/blackfin/mach-bf533/boards/ezkit.c index 463a72358b0e..d64d270e9e62 100644 --- a/arch/blackfin/mach-bf533/boards/ezkit.c +++ b/arch/blackfin/mach-bf533/boards/ezkit.c @@ -395,9 +395,9 @@ static struct gpiod_lookup_table bfin_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF1, NULL, 0, - GPIO_ACTIVE_HIGH), + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF0, NULL, 1, - GPIO_ACTIVE_HIGH), + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/blackfin/mach-bf533/boards/stamp.c b/arch/blackfin/mach-bf533/boards/stamp.c index d2479359adb7..27cbf2fa2c62 100644 --- a/arch/blackfin/mach-bf533/boards/stamp.c +++ b/arch/blackfin/mach-bf533/boards/stamp.c @@ -517,9 +517,9 @@ static struct gpiod_lookup_table bfin_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF2, NULL, 0, - GPIO_ACTIVE_HIGH), + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF3, NULL, 1, - GPIO_ACTIVE_HIGH), + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/blackfin/mach-bf561/boards/ezkit.c b/arch/blackfin/mach-bf561/boards/ezkit.c index 72f757ebaa84..acc5363f60c6 100644 --- a/arch/blackfin/mach-bf561/boards/ezkit.c +++ b/arch/blackfin/mach-bf561/boards/ezkit.c @@ -384,9 +384,9 @@ static struct gpiod_lookup_table bfin_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF1, NULL, 0, - GPIO_ACTIVE_HIGH), + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF0, NULL, 1, - GPIO_ACTIVE_HIGH), + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/arch/mips/alchemy/board-gpr.c b/arch/mips/alchemy/board-gpr.c index daebc36e5ecb..328d697e72b4 100644 --- a/arch/mips/alchemy/board-gpr.c +++ b/arch/mips/alchemy/board-gpr.c @@ -235,6 +235,10 @@ static struct gpiod_lookup_table gpr_i2c_gpiod_table = { }; static struct i2c_gpio_platform_data gpr_i2c_data = { + /* + * The open drain mode is hardwired somewhere or an electrical + * property of the alchemy GPIO controller. + */ .sda_is_open_drain = 1, .scl_is_open_drain = 1, .udelay = 2, /* ~100 kHz */ diff --git a/arch/mips/ath79/mach-pb44.c b/arch/mips/ath79/mach-pb44.c index a95409063847..6b2c6f3baefa 100644 --- a/arch/mips/ath79/mach-pb44.c +++ b/arch/mips/ath79/mach-pb44.c @@ -37,9 +37,9 @@ static struct gpiod_lookup_table pb44_i2c_gpiod_table = { .dev_id = "i2c-gpio", .table = { GPIO_LOOKUP_IDX("ath79-gpio", PB44_GPIO_I2C_SDA, - NULL, 0, GPIO_ACTIVE_HIGH), + NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), GPIO_LOOKUP_IDX("ath79-gpio", PB44_GPIO_I2C_SCL, - NULL, 1, GPIO_ACTIVE_HIGH), + NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), }, }; diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c index 4d40d013a412..ad774161a22d 100644 --- a/drivers/mfd/sm501.c +++ b/drivers/mfd/sm501.c @@ -1152,7 +1152,7 @@ static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm, lookup->table[0].chip_hwnum = iic->pin_sda % 32; lookup->table[0].con_id = NULL; lookup->table[0].idx = 0; - lookup->table[0].flags = GPIO_ACTIVE_HIGH; + lookup->table[0].flags = GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN; if (iic->pin_scl < 32) lookup->table[1].chip_label = "SM501-LOW"; else @@ -1160,7 +1160,7 @@ static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm, lookup->table[1].chip_hwnum = iic->pin_scl % 32; lookup->table[1].con_id = NULL; lookup->table[1].idx = 1; - lookup->table[1].flags = GPIO_ACTIVE_HIGH; + lookup->table[1].flags = GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN; gpiod_add_lookup_table(lookup); icd = dev_get_platdata(&pdev->dev); From patchwork Sun Sep 17 09:39:04 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 112827 Delivered-To: patch@linaro.org Received: by 10.140.106.117 with SMTP id d108csp2503510qgf; 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[85.224.9.34]) by smtp.gmail.com with ESMTPSA id t84sm974559lfi.21.2017.09.17.02.39.29 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 17 Sep 2017 02:39:30 -0700 (PDT) From: Linus Walleij To: Wolfram Sang , linux-i2c@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-mips@linux-mips.org, adi-buildroot-devel@lists.sourceforge.net, Geert Uytterhoeven , Linus Walleij Subject: [PATCH 5/7] i2c: gpio: Local vars in probe Date: Sun, 17 Sep 2017 11:39:04 +0200 Message-Id: <20170917093906.16325-6-linus.walleij@linaro.org> X-Mailer: git-send-email 2.13.5 In-Reply-To: <20170917093906.16325-1-linus.walleij@linaro.org> References: <20170917093906.16325-1-linus.walleij@linaro.org> Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org By creating local variables for *dev and *np, the code become much easier to read, in my opinion. Signed-off-by: Linus Walleij --- I put this at the end of the series because compared to the rest of the patches it is completely unimportant. --- drivers/i2c/busses/i2c-gpio.c | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) -- 2.13.5 diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c index 97b9c29e9429..beb5ce523684 100644 --- a/drivers/i2c/busses/i2c-gpio.c +++ b/drivers/i2c/busses/i2c-gpio.c @@ -88,10 +88,12 @@ static int i2c_gpio_probe(struct platform_device *pdev) struct i2c_gpio_platform_data *pdata; struct i2c_algo_bit_data *bit_data; struct i2c_adapter *adap; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; enum gpiod_flags gflags; int ret; - priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; @@ -99,15 +101,15 @@ static int i2c_gpio_probe(struct platform_device *pdev) bit_data = &priv->bit_data; pdata = &priv->pdata; - if (pdev->dev.of_node) { - of_i2c_gpio_get_props(pdev->dev.of_node, pdata); + if (np) { + of_i2c_gpio_get_props(np, pdata); } else { /* * If all platform data settings are zero it is OK * to not provide any platform data from the board. */ - if (dev_get_platdata(&pdev->dev)) - memcpy(pdata, dev_get_platdata(&pdev->dev), + if (dev_get_platdata(dev)) + memcpy(pdata, dev_get_platdata(dev), sizeof(*pdata)); } @@ -123,7 +125,7 @@ static int i2c_gpio_probe(struct platform_device *pdev) gflags = GPIOD_OUT_HIGH; else gflags = GPIOD_OUT_HIGH_OPEN_DRAIN; - priv->sda = devm_gpiod_get_index(&pdev->dev, NULL, 0, gflags); + priv->sda = devm_gpiod_get_index(dev, NULL, 0, gflags); if (IS_ERR(priv->sda)) { ret = PTR_ERR(priv->sda); /* FIXME: hack in the old code, is this really necessary? */ @@ -142,7 +144,7 @@ static int i2c_gpio_probe(struct platform_device *pdev) gflags = GPIOD_OUT_LOW; else gflags = GPIOD_OUT_LOW_OPEN_DRAIN; - priv->scl = devm_gpiod_get_index(&pdev->dev, NULL, 1, gflags); + priv->scl = devm_gpiod_get_index(dev, NULL, 1, gflags); if (IS_ERR(priv->scl)) { ret = PTR_ERR(priv->scl); /* FIXME: hack in the old code, is this really necessary? */ @@ -173,15 +175,15 @@ static int i2c_gpio_probe(struct platform_device *pdev) bit_data->data = priv; adap->owner = THIS_MODULE; - if (pdev->dev.of_node) - strlcpy(adap->name, dev_name(&pdev->dev), sizeof(adap->name)); + if (np) + strlcpy(adap->name, dev_name(dev), sizeof(adap->name)); else snprintf(adap->name, sizeof(adap->name), "i2c-gpio%d", pdev->id); adap->algo_data = bit_data; adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; - adap->dev.parent = &pdev->dev; - adap->dev.of_node = pdev->dev.of_node; + adap->dev.parent = dev; + adap->dev.of_node = np; adap->nr = pdev->id; ret = i2c_bit_add_numbered_bus(adap); @@ -195,7 +197,7 @@ static int i2c_gpio_probe(struct platform_device *pdev) * get accessors to get the actual name of the GPIO line, * from the descriptor, then provide that instead. */ - dev_info(&pdev->dev, "using lines %u (SDA) and %u (SCL%s)\n", + dev_info(dev, "using lines %u (SDA) and %u (SCL%s)\n", desc_to_gpio(priv->sda), desc_to_gpio(priv->scl), pdata->scl_is_output_only ? 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[85.224.9.34]) by smtp.gmail.com with ESMTPSA id t84sm974559lfi.21.2017.09.17.02.40.15 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 17 Sep 2017 02:40:15 -0700 (PDT) From: Linus Walleij To: Wolfram Sang , linux-i2c@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-mips@linux-mips.org, adi-buildroot-devel@lists.sourceforge.net, Geert Uytterhoeven , Linus Walleij Subject: [PATCH 7/7] i2c: gpio: Add support for named gpios in DT Date: Sun, 17 Sep 2017 11:39:06 +0200 Message-Id: <20170917093906.16325-8-linus.walleij@linaro.org> X-Mailer: git-send-email 2.13.5 In-Reply-To: <20170917093906.16325-1-linus.walleij@linaro.org> References: <20170917093906.16325-1-linus.walleij@linaro.org> Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org This adds support for using the "sda" and "scl" GPIOs in device tree instead of anonymously using index 0 and 1 of the "gpios" property. We add a helper function to retrieve the GPIO descriptors and some explicit error handling since the probe may have to be deferred. At least this happened to me when moving to using named "sda" and "scl" lines (all of a sudden this started to probe before the GPIO driver) so we need to gracefully defer probe when we ge -ENOENT in the error pointer. Suggested-by: Geert Uytterhoeven Signed-off-by: Linus Walleij --- This is pretty much a rewrite of Geerts patch on top of my own changes to support descriptors. --- drivers/i2c/busses/i2c-gpio.c | 59 +++++++++++++++++++++++++++++++------------ 1 file changed, 43 insertions(+), 16 deletions(-) -- 2.13.5 diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c index beb5ce523684..2738b851f470 100644 --- a/drivers/i2c/busses/i2c-gpio.c +++ b/drivers/i2c/busses/i2c-gpio.c @@ -82,6 +82,42 @@ static void of_i2c_gpio_get_props(struct device_node *np, of_property_read_bool(np, "i2c-gpio,scl-output-only"); } +static struct gpio_desc *i2c_gpio_get_desc(struct device *dev, + const char *con_id, + unsigned int index, + enum gpiod_flags gflags) +{ + struct gpio_desc *retdesc; + int ret; + + retdesc = devm_gpiod_get(dev, con_id, gflags); + if (!IS_ERR(retdesc)) { + dev_dbg(dev, "got GPIO from name %s\n", con_id); + return retdesc; + } + + retdesc = devm_gpiod_get_index(dev, NULL, index, gflags); + if (!IS_ERR(retdesc)) { + dev_dbg(dev, "got GPIO from index %u\n", index); + return retdesc; + } + + ret = PTR_ERR(retdesc); + + /* FIXME: hack in the old code, is this really necessary? */ + if (ret == -EINVAL) + retdesc = ERR_PTR(-EPROBE_DEFER); + + /* This happens if the GPIO driver is not yet probed, let's defer */ + if (ret == -ENOENT) + retdesc = ERR_PTR(-EPROBE_DEFER); + + if (ret != -EPROBE_DEFER) + dev_err(dev, "error trying to get descriptor: %ld\n", ret); + + return retdesc; +} + static int i2c_gpio_probe(struct platform_device *pdev) { struct i2c_gpio_private_data *priv; @@ -125,14 +161,10 @@ static int i2c_gpio_probe(struct platform_device *pdev) gflags = GPIOD_OUT_HIGH; else gflags = GPIOD_OUT_HIGH_OPEN_DRAIN; - priv->sda = devm_gpiod_get_index(dev, NULL, 0, gflags); - if (IS_ERR(priv->sda)) { - ret = PTR_ERR(priv->sda); - /* FIXME: hack in the old code, is this really necessary? */ - if (ret == -EINVAL) - ret = -EPROBE_DEFER; - return ret; - } + priv->sda = i2c_gpio_get_desc(dev, "sda", 0, gflags); + if (IS_ERR(priv->sda)) + return PTR_ERR(priv->sda); + /* * If the SCL line is marked from platform data or device tree as * "open drain" it means something outside of our control is making @@ -144,14 +176,9 @@ static int i2c_gpio_probe(struct platform_device *pdev) gflags = GPIOD_OUT_LOW; else gflags = GPIOD_OUT_LOW_OPEN_DRAIN; - priv->scl = devm_gpiod_get_index(dev, NULL, 1, gflags); - if (IS_ERR(priv->scl)) { - ret = PTR_ERR(priv->scl); - /* FIXME: hack in the old code, is this really necessary? */ - if (ret == -EINVAL) - ret = -EPROBE_DEFER; - return ret; - } + priv->scl = i2c_gpio_get_desc(dev, "scl", 1, gflags); + if (IS_ERR(priv->scl)) + return PTR_ERR(priv->scl); bit_data->setsda = i2c_gpio_setsda_val; bit_data->setscl = i2c_gpio_setscl_val;