| Message ID | 5822b56a4e65e27183f8bf712d5889b11f90111e.1515118527.git.baolin.wang@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | power: reset: Add Spreadtrum SC27xx PMIC power off support | expand |
Hi Sebastian, On 15 January 2018 at 15:58, Baolin Wang <baolin.wang@linaro.org> wrote: > On Spreadtrum platform, we need power off system through external SC27xx > series PMICs including the SC2720, SC2721, SC2723, SC2730 and SC2731 chips. > Thus this patch adds SC27xx series PMICs power-off support. > > Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Do you have any comments for this patch? Thanks. > --- > drivers/power/reset/Kconfig | 9 +++++ > drivers/power/reset/Makefile | 1 + > drivers/power/reset/sc27xx-poweroff.c | 65 +++++++++++++++++++++++++++++++++ > 3 files changed, 75 insertions(+) > create mode 100644 drivers/power/reset/sc27xx-poweroff.c > > diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig > index ca0de1a..611ae56 100644 > --- a/drivers/power/reset/Kconfig > +++ b/drivers/power/reset/Kconfig > @@ -227,5 +227,14 @@ config SYSCON_REBOOT_MODE > register, then the bootloader can read it to take different > action according to the mode. > > +config POWER_RESET_SC27XX > + tristate "Spreadtrum SC27xx PMIC power-off driver" > + depends on MFD_SC27XX_PMIC || COMPILE_TEST > + help > + This driver supports powering off a system through > + Spreadtrum SC27xx series PMICs. The SC27xx series > + PMICs includes the SC2720, SC2721, SC2723, SC2730 > + and SC2731 chips. > + > endif > > diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile > index aeb65ed..225d645 100644 > --- a/drivers/power/reset/Makefile > +++ b/drivers/power/reset/Makefile > @@ -27,3 +27,4 @@ obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o > obj-$(CONFIG_POWER_RESET_ZX) += zx-reboot.o > obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o > obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o > +obj-$(CONFIG_POWER_RESET_SC27XX) += sc27xx-poweroff.o > diff --git a/drivers/power/reset/sc27xx-poweroff.c b/drivers/power/reset/sc27xx-poweroff.c > new file mode 100644 > index 0000000..8e4b6a0 > --- /dev/null > +++ b/drivers/power/reset/sc27xx-poweroff.c > @@ -0,0 +1,65 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2017 Spreadtrum Communications Inc. > + * Copyright (c) 2017 Linaro Ltd. > + */ > + > +#include <linux/cpu.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/pm.h> > +#include <linux/regmap.h> > +#include <linux/syscore_ops.h> > + > +#define SC27XX_PWR_PD_HW 0xc2c > +#define SC27XX_PWR_OFF_EN BIT(0) > + > +static struct regmap *regmap; > + > +/* > + * On Spreadtrum platform, we need power off system through external SC27xx > + * series PMICs, and it is one similar SPI bus mapped by regmap to access PMIC, > + * which is not fast io access. > + * > + * So before stopping other cores, we need release other cores' resource by > + * taking cpus down to avoid racing regmap or spi mutex lock when poweroff > + * system through PMIC. > + */ > +void sc27xx_poweroff_shutdown(void) > +{ > + int cpu = smp_processor_id(); > + > + freeze_secondary_cpus(cpu); > +} > + > +static struct syscore_ops poweroff_syscore_ops = { > + .shutdown = sc27xx_poweroff_shutdown, > +}; > + > +static void sc27xx_poweroff_do_poweroff(void) > +{ > + regmap_write(regmap, SC27XX_PWR_PD_HW, SC27XX_PWR_OFF_EN); > +} > + > +static int sc27xx_poweroff_probe(struct platform_device *pdev) > +{ > + regmap = dev_get_regmap(pdev->dev.parent, NULL); > + if (!regmap) > + return -ENODEV; > + > + pm_power_off = sc27xx_poweroff_do_poweroff; > + register_syscore_ops(&poweroff_syscore_ops); > + return 0; > +} > + > +static struct platform_driver sc27xx_poweroff_driver = { > + .probe = sc27xx_poweroff_probe, > + .driver = { > + .name = "sc27xx-poweroff", > + }, > +}; > +module_platform_driver(sc27xx_poweroff_driver); > + > +MODULE_DESCRIPTION("Spreadtrum SC27xx PMIC Poweroff Driver"); > +MODULE_LICENSE("GPL v2"); > -- > 1.7.9.5 > -- Baolin.wang Best Regards
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index ca0de1a..611ae56 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -227,5 +227,14 @@ config SYSCON_REBOOT_MODE register, then the bootloader can read it to take different action according to the mode. +config POWER_RESET_SC27XX + tristate "Spreadtrum SC27xx PMIC power-off driver" + depends on MFD_SC27XX_PMIC || COMPILE_TEST + help + This driver supports powering off a system through + Spreadtrum SC27xx series PMICs. The SC27xx series + PMICs includes the SC2720, SC2721, SC2723, SC2730 + and SC2731 chips. + endif diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index aeb65ed..225d645 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -27,3 +27,4 @@ obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o obj-$(CONFIG_POWER_RESET_ZX) += zx-reboot.o obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o +obj-$(CONFIG_POWER_RESET_SC27XX) += sc27xx-poweroff.o diff --git a/drivers/power/reset/sc27xx-poweroff.c b/drivers/power/reset/sc27xx-poweroff.c new file mode 100644 index 0000000..8e4b6a0 --- /dev/null +++ b/drivers/power/reset/sc27xx-poweroff.c @@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2017 Spreadtrum Communications Inc. + * Copyright (c) 2017 Linaro Ltd. + */ + +#include <linux/cpu.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/regmap.h> +#include <linux/syscore_ops.h> + +#define SC27XX_PWR_PD_HW 0xc2c +#define SC27XX_PWR_OFF_EN BIT(0) + +static struct regmap *regmap; + +/* + * On Spreadtrum platform, we need power off system through external SC27xx + * series PMICs, and it is one similar SPI bus mapped by regmap to access PMIC, + * which is not fast io access. + * + * So before stopping other cores, we need release other cores' resource by + * taking cpus down to avoid racing regmap or spi mutex lock when poweroff + * system through PMIC. + */ +void sc27xx_poweroff_shutdown(void) +{ + int cpu = smp_processor_id(); + + freeze_secondary_cpus(cpu); +} + +static struct syscore_ops poweroff_syscore_ops = { + .shutdown = sc27xx_poweroff_shutdown, +}; + +static void sc27xx_poweroff_do_poweroff(void) +{ + regmap_write(regmap, SC27XX_PWR_PD_HW, SC27XX_PWR_OFF_EN); +} + +static int sc27xx_poweroff_probe(struct platform_device *pdev) +{ + regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!regmap) + return -ENODEV; + + pm_power_off = sc27xx_poweroff_do_poweroff; + register_syscore_ops(&poweroff_syscore_ops); + return 0; +} + +static struct platform_driver sc27xx_poweroff_driver = { + .probe = sc27xx_poweroff_probe, + .driver = { + .name = "sc27xx-poweroff", + }, +}; +module_platform_driver(sc27xx_poweroff_driver); + +MODULE_DESCRIPTION("Spreadtrum SC27xx PMIC Poweroff Driver"); +MODULE_LICENSE("GPL v2");
On Spreadtrum platform, we need power off system through external SC27xx series PMICs including the SC2720, SC2721, SC2723, SC2730 and SC2731 chips. Thus this patch adds SC27xx series PMICs power-off support. Signed-off-by: Baolin Wang <baolin.wang@linaro.org> --- drivers/power/reset/Kconfig | 9 +++++ drivers/power/reset/Makefile | 1 + drivers/power/reset/sc27xx-poweroff.c | 65 +++++++++++++++++++++++++++++++++ 3 files changed, 75 insertions(+) create mode 100644 drivers/power/reset/sc27xx-poweroff.c -- 1.7.9.5