From a8d5d1b7fbc78132f5def4b8af4f221df83df04e Mon Sep 17 00:00:00 2001 From: Nick Bulleid Date: Thu, 10 May 2018 21:57:02 +0100 Subject: [PATCH] Add ability to export gpio used by gpio-poweroff Signed-off-by: Nick Bulleid Added export feature to gpio-poweroff documentation Signed-off-by: Nick Bulleid --- .../devicetree/bindings/power/reset/gpio-poweroff.txt | 1 + drivers/power/reset/gpio-poweroff.c | 9 +++++++++ 2 files changed, 10 insertions(+) --- a/Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt +++ b/Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt @@ -31,6 +31,7 @@ Optional properties: - inactive-delay-ms: Delay (default 100) to wait after driving gpio inactive - timeout-ms: Time to wait before asserting a WARN_ON(1). If nothing is specified, 3000 ms is used. +- export : Export the GPIO line to the sysfs system Examples: --- a/drivers/power/reset/gpio-poweroff.c +++ b/drivers/power/reset/gpio-poweroff.c @@ -51,6 +51,7 @@ static int gpio_poweroff_probe(struct pl bool input = false; enum gpiod_flags flags; bool force = false; + bool export = false; /* If a pm_power_off function has already been added, leave it alone */ force = of_property_read_bool(pdev->dev.of_node, "force"); @@ -76,6 +77,12 @@ static int gpio_poweroff_probe(struct pl if (IS_ERR(reset_gpio)) return PTR_ERR(reset_gpio); + export = of_property_read_bool(pdev->dev.of_node, "export"); + if (export) { + gpiod_export(reset_gpio, false); + gpiod_export_link(&pdev->dev, "poweroff-gpio", reset_gpio); + } + pm_power_off = &gpio_poweroff_do_poweroff; return 0; } @@ -85,6 +92,8 @@ static int gpio_poweroff_remove(struct p if (pm_power_off == &gpio_poweroff_do_poweroff) pm_power_off = NULL; + gpiod_unexport(reset_gpio); + return 0; }