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Add ability to export gpio used by gpio-poweroff

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Signed-off-by: Nick Bulleid <nedbulleid@fastmail.com>

Added export feature to gpio-poweroff documentation

Signed-off-by: Nick Bulleid <nedbulleid@fastmail.com>
This commit is contained in:
Nick Bulleid
2018-05-10 21:57:02 +01:00
committed by popcornmix
parent 001bc46225
commit 02980ce46d
2 changed files with 10 additions and 0 deletions
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1
Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt
View File

@@ -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:

9
drivers/power/reset/gpio-poweroff.c
View File

@@ -51,6 +51,7 @@ static int gpio_poweroff_probe(struct platform_device *pdev)
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 platform_device *pdev)
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 platform_device *pdev)
if (pm_power_off == &gpio_poweroff_do_poweroff)
pm_power_off = NULL;
gpiod_unexport(reset_gpio);
return 0;
}