| From 4c957b11a439d372c26d5f90ef81ec52d1839a0c Mon Sep 17 00:00:00 2001 |
| From: Nick Bulleid <nedbulleid@fastmail.com> |
| 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 <nedbulleid@fastmail.com> |
| |
| Added export feature to gpio-poweroff documentation |
| |
| Signed-off-by: Nick Bulleid <nedbulleid@fastmail.com> |
| --- |
| .../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; |
| } |
| |