Hi Antony,
On Fri, Nov 08, 2019 at 02:56:45PM +0300, Antony Pavlov wrote:
> Signed-off-by: Antony Pavlov <antonynpavlov@xxxxxxxxx>
> ---
> drivers/reset/Kconfig | 7 +++
> drivers/reset/Makefile | 1 +
> drivers/reset/gpio-poweroff.c | 86 +++++++++++++++++++++++++++++++++++
> 3 files changed, 94 insertions(+)
>
> diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
> index 048f2081f8..21b61e036f 100644
> --- a/drivers/reset/Kconfig
> +++ b/drivers/reset/Kconfig
> @@ -26,4 +26,11 @@ config RESET_STM32
> help
> This enables the reset controller driver for STM32MP and STM32 MCUs.
>
> +config RESET_GPIO_POWEROFF
> + bool "GPIO power-off driver"
> + 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.
> +
> endif
> diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
> index 8460c4b154..efd9c951f3 100644
> --- a/drivers/reset/Makefile
> +++ b/drivers/reset/Makefile
> @@ -2,3 +2,4 @@ obj-$(CONFIG_RESET_CONTROLLER) += core.o
> obj-$(CONFIG_ARCH_SOCFPGA) += reset-socfpga.o
> obj-$(CONFIG_RESET_IMX7) += reset-imx7.o
> obj-$(CONFIG_RESET_STM32) += reset-stm32.o
> +obj-$(CONFIG_RESET_GPIO_POWEROFF) += gpio-poweroff.o
> diff --git a/drivers/reset/gpio-poweroff.c b/drivers/reset/gpio-poweroff.c
> new file mode 100644
> index 0000000000..89f9ff69c5
> --- /dev/null
> +++ b/drivers/reset/gpio-poweroff.c
> @@ -0,0 +1,86 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Toggles a GPIO pin to power down a device
> + *
> + * Copyright (C) 2019 Antony Pavlov <antonynpavlov@xxxxxxxxx>
> + *
> + * Based on linux/drivers/power/reset/gpio-poweroff.c
> + *
> + * Jamie Lentin <jm@xxxxxxxxxxxx>
> + * Andrew Lunn <andrew@xxxxxxx>
> + *
> + * Copyright (C) 2012 Jamie Lentin
> + */
> +
> +#include <common.h>
> +#include <errno.h>
> +#include <init.h>
> +#include <gpio.h>
> +#include <of_gpio.h>
> +#include <poweroff.h>
> +
> +/*
> + * Hold configuration here.
> + * Cannot be more than one instance of the driver.
> + */
> +static int reset_gpio;
> +
> +static void gpio_poweroff_do_poweroff(struct poweroff_handler *handler)
> +{
> + shutdown_barebox();
> +
> + /* drive it active, also inactive->active edge */
> + gpio_direction_output(reset_gpio, 1);
> + mdelay(100);
> + /* drive inactive, also active->inactive edge */
> + gpio_set_value(reset_gpio, 0);
> + mdelay(100);
> +
> + /* drive it active, also inactive->active edge */
> + gpio_set_value(reset_gpio, 1);
> +
> + /* give it some time */
> + mdelay(3000);
> +
> + WARN_ON(1);
> + unreachable();
> +}
> +
> +static int __init gpio_poweroff_probe(struct device_d *dev)
> +{
> + int ret, reset_gpio;
> + enum of_gpio_flags flags;
> +
> + if (!IS_ENABLED(CONFIG_OFDEVICE) || !IS_ENABLED(CONFIG_OF_GPIO))
> + return -ENODEV;
You could use depends on in Kconfig. No need to compile in a driver
which doesn't work.
> +
> + reset_gpio = of_get_named_gpio_flags(dev->device_node, "gpios", 0, &flags);
As flags are unused, use of_get_named_gpio()?
> + if (reset_gpio < 0) {
> + if (reset_gpio != -EPROBE_DEFER)
> + dev_err(dev, "failed to get gpio for %s: %d\n",
> + dev->device_node, reset_gpio);
> + return reset_gpio;
> + }
> +
> + ret = gpio_request(reset_gpio, "gpio_poweroff");
> + if (ret) {
> + pr_err("gpio_poweroff: (%d) can not be requested\n", reset_gpio);
dev_err please.
Sascha
--
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