From patchwork Wed Jul 1 17:26:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Reichel X-Patchwork-Id: 240644 List-Id: U-Boot discussion From: sebastian.reichel at collabora.com (Sebastian Reichel) Date: Wed, 1 Jul 2020 19:26:21 +0200 Subject: [PATCH 08/12] poweroff: Add poweroff-gpio driver In-Reply-To: <20200701172625.121978-1-sebastian.reichel@collabora.com> References: <20200701172625.121978-1-sebastian.reichel@collabora.com> Message-ID: <20200701172625.121978-9-sebastian.reichel@collabora.com> Add GPIO poweroff driver, which is based on the Linux driver and uses the same DT binding. Signed-off-by: Sebastian Reichel --- drivers/power/Kconfig | 8 ++++ drivers/power/Makefile | 1 + drivers/power/poweroff-gpio.c | 87 +++++++++++++++++++++++++++++++++++ 3 files changed, 96 insertions(+) create mode 100644 drivers/power/poweroff-gpio.c diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 5a76e23b5fb0..d1eaa0895ddd 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -382,4 +382,12 @@ config POWEROFF provide access to board-specific implementations. Using device tree for configuration is recommended. +config POWEROFF_GPIO + bool "GPIO power-off driver" + depends on POWEROFF + help + This driver supports turning off your board via a GPIO line. + If your board needs a GPIO high/low to power down, say Y and + create a binding in your devicetree. + endmenu diff --git a/drivers/power/Makefile b/drivers/power/Makefile index 924e99114ccd..34a2c2c48195 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -23,3 +23,4 @@ obj-$(CONFIG_POWER_SPI) += power_spi.o obj-$(CONFIG_POWER_MT6323) += mt6323.o obj-$(CONFIG_POWEROFF) += poweroff-uclass.o +obj-$(CONFIG_POWEROFF_GPIO) += poweroff-gpio.o diff --git a/drivers/power/poweroff-gpio.c b/drivers/power/poweroff-gpio.c new file mode 100644 index 000000000000..cf2bdab9e551 --- /dev/null +++ b/drivers/power/poweroff-gpio.c @@ -0,0 +1,87 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Toggles a GPIO pin to power down a device + * + * Created using the Linux driver as reference, which + * has been written by: + * + * Jamie Lentin + * Andrew Lunn + * + * Copyright (C) 2012 Jamie Lentin + */ + +#include +#include +#include +#include +#include +#include + +struct poweroff_gpio_info { + struct gpio_desc gpio; + u32 active_delay; + u32 inactive_delay; + u32 timeout; +}; + +static int poweroff_gpio_do_poweroff(struct udevice *dev) +{ + struct poweroff_gpio_info *priv = dev_get_priv(dev); + + /* drive it active, also inactive->active edge */ + dm_gpio_set_value(&priv->gpio, 1); + mdelay(priv->active_delay); + + /* drive inactive, also active->inactive edge */ + dm_gpio_set_value(&priv->gpio, 0); + mdelay(priv->inactive_delay); + + /* drive it active, also inactive->active edge */ + dm_gpio_set_value(&priv->gpio, 1); + + /* give it some time */ + mdelay(priv->timeout); + + return -ETIMEDOUT; +} + +static int poweroff_gpio_probe(struct udevice *dev) +{ + struct poweroff_gpio_info *priv = dev_get_priv(dev); + int flags; + + if (dev_read_bool(dev, "input")) + flags = GPIOD_IS_IN; + else + flags = GPIOD_IS_OUT; + + priv->active_delay = 100; + dev_read_u32(dev, "active-delay-ms", &priv->active_delay); + + priv->inactive_delay = 100; + dev_read_u32(dev, "inactive-delay-ms", &priv->inactive_delay); + + priv->timeout = 3000; + dev_read_u32(dev, "timeout-ms", &priv->timeout); + + return gpio_request_by_name(dev, "gpios", 0, &priv->gpio, flags); +} + +static const struct poweroff_ops poweroff_gpio_ops = { + .poweroff = poweroff_gpio_do_poweroff, +}; + +static const struct udevice_id poweroff_gpio_ids[] = { + { .compatible = "gpio-poweroff", }, + {}, +}; + +U_BOOT_DRIVER(poweroff_gpio) = { + .name = "poweroff-gpio", + .id = UCLASS_POWEROFF, + .ops = &poweroff_gpio_ops, + .probe = poweroff_gpio_probe, + .priv_auto_alloc_size = sizeof(struct poweroff_gpio_info), + .of_match = poweroff_gpio_ids, +};