Add GPIO poweroff driver, which is based on the Linux driver and uses the same DT binding.
Signed-off-by: Sebastian Reichel sebastian.reichel@collabora.com --- drivers/sysreset/Kconfig | 6 +++ drivers/sysreset/Makefile | 1 + drivers/sysreset/poweroff_gpio.c | 84 ++++++++++++++++++++++++++++++++ 3 files changed, 91 insertions(+) create mode 100644 drivers/sysreset/poweroff_gpio.c
diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig index 6ebc90e1d33b..82af8db47f65 100644 --- a/drivers/sysreset/Kconfig +++ b/drivers/sysreset/Kconfig @@ -43,6 +43,12 @@ config SYSRESET_CMD_POWEROFF
endif
+config POWEROFF_GPIO + bool "Enable support for GPIO poweroff driver" + select DM_GPIO + help + Poweroff support via GPIO pin connected reset logic. + config SYSRESET_GPIO bool "Enable support for GPIO reset driver" select DM_GPIO diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile index df2293b8489d..90a9b26abef4 100644 --- a/drivers/sysreset/Makefile +++ b/drivers/sysreset/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_ARCH_ASPEED) += sysreset_ast.o obj-$(CONFIG_ARCH_ROCKCHIP) += sysreset_rockchip.o obj-$(CONFIG_ARCH_STI) += sysreset_sti.o obj-$(CONFIG_SANDBOX) += sysreset_sandbox.o +obj-$(CONFIG_POWEROFF_GPIO) += poweroff_gpio.o obj-$(CONFIG_SYSRESET_GPIO) += sysreset_gpio.o obj-$(CONFIG_SYSRESET_MPC83XX) += sysreset_mpc83xx.o obj-$(CONFIG_SYSRESET_MICROBLAZE) += sysreset_microblaze.o diff --git a/drivers/sysreset/poweroff_gpio.c b/drivers/sysreset/poweroff_gpio.c new file mode 100644 index 000000000000..0eb2426d7574 --- /dev/null +++ b/drivers/sysreset/poweroff_gpio.c @@ -0,0 +1,84 @@ +// 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 jm@lentin.co.uk + * Andrew Lunn andrew@lunn.ch + * + * Copyright (C) 2012 Jamie Lentin + */ + +#include <common.h> +#include <asm/gpio.h> +#include <dm.h> +#include <errno.h> +#include <linux/delay.h> +#include <log.h> +#include <sysreset.h> + +struct poweroff_gpio_info { + struct gpio_desc gpio; + u32 active_delay; + u32 inactive_delay; + u32 timeout; +}; + +static int poweroff_gpio_request(struct udevice *dev, enum sysreset_t type) +{ + struct poweroff_gpio_info *priv = dev_get_priv(dev); + + if (type != SYSRESET_POWER_OFF) + return -ENOSYS; + + debug("GPIO poweroff\n"); + + /* 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; + + flags = dev_read_bool(dev, "input") ? GPIOD_IS_IN : GPIOD_IS_OUT; + priv->active_delay = dev_read_u32_default(dev, "active-delay-ms", 100); + priv->inactive_delay = dev_read_u32_default(dev, "inactive-delay-ms", 100); + priv->timeout = dev_read_u32_default(dev, "timeout-ms", 3000); + + return gpio_request_by_name(dev, "gpios", 0, &priv->gpio, flags); +} + +static struct sysreset_ops poweroff_gpio_ops = { + .request = poweroff_gpio_request, +}; + +static const struct udevice_id poweroff_gpio_ids[] = { + { .compatible = "gpio-poweroff", }, + {}, +}; + +U_BOOT_DRIVER(poweroff_gpio) = { + .name = "poweroff-gpio", + .id = UCLASS_SYSRESET, + .ops = &poweroff_gpio_ops, + .probe = poweroff_gpio_probe, + .priv_auto_alloc_size = sizeof(struct poweroff_gpio_info), + .of_match = poweroff_gpio_ids, +};