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58 lines
1.8 KiB
Diff
58 lines
1.8 KiB
Diff
From 3e060982d93902bcca8503df4e33d6cd1e41e21b Mon Sep 17 00:00:00 2001
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From: Nick Bulleid <nedbulleid@fastmail.com>
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Date: Thu, 10 May 2018 21:57:02 +0100
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Subject: [PATCH] Add ability to export gpio used by gpio-poweroff
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Signed-off-by: Nick Bulleid <nedbulleid@fastmail.com>
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Added export feature to gpio-poweroff documentation
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Signed-off-by: Nick Bulleid <nedbulleid@fastmail.com>
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---
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.../devicetree/bindings/power/reset/gpio-poweroff.txt | 1 +
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drivers/power/reset/gpio-poweroff.c | 9 +++++++++
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2 files changed, 10 insertions(+)
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--- a/Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt
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+++ b/Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt
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@@ -29,6 +29,7 @@ Optional properties:
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inactive state.
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- timeout-ms: Time to wait before asserting a WARN_ON(1). If nothing is
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specified, 3000 ms is used.
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+- export : Export the GPIO line to the sysfs system
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Examples:
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--- a/drivers/power/reset/gpio-poweroff.c
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+++ b/drivers/power/reset/gpio-poweroff.c
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@@ -52,6 +52,7 @@ static int gpio_poweroff_probe(struct pl
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bool input = false;
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enum gpiod_flags flags;
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bool force = false;
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+ bool export = false;
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/* If a pm_power_off function has already been added, leave it alone */
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force = of_property_read_bool(pdev->dev.of_node, "force");
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@@ -74,6 +75,12 @@ static int gpio_poweroff_probe(struct pl
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if (IS_ERR(reset_gpio))
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return PTR_ERR(reset_gpio);
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+ export = of_property_read_bool(pdev->dev.of_node, "export");
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+ if (export) {
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+ gpiod_export(reset_gpio, false);
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+ gpiod_export_link(&pdev->dev, "poweroff-gpio", reset_gpio);
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+ }
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+
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pm_power_off = &gpio_poweroff_do_poweroff;
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return 0;
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}
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@@ -83,6 +90,8 @@ static int gpio_poweroff_remove(struct p
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if (pm_power_off == &gpio_poweroff_do_poweroff)
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pm_power_off = NULL;
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+ gpiod_unexport(reset_gpio);
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+
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return 0;
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}
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