openwrt/target/linux/brcm2708/patches-4.19/950-0130-Add-ability-to-export-gpio-used-by-gpio-poweroff.patch

From 3e25c39320a501e57a5e232f6e98740357bd5bc6 Mon Sep 17 00:00:00 2001
From: Nick Bulleid <nedbulleid@fastmail.com>
Date: Thu, 10 May 2018 21:57:02 +0100
Subject: [PATCH 130/725] 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
@@ -29,6 +29,7 @@ Optional properties:
   inactive state.
 - 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
@@ -52,6 +52,7 @@ 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");
@@ -74,6 +75,12 @@ 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;
 }
@@ -83,6 +90,8 @@ 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;
 }