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From a8d5d1b7fbc78132f5def4b8af4f221df83df04e 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;
}
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