2017-03-04 18:37:50 +00:00
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From 7e8bb86739df17e38a0ebe6e17b7a9056ab421e9 Mon Sep 17 00:00:00 2001
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2017-02-07 20:07:54 +00:00
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Thu, 25 Jun 2015 12:16:11 +0100
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Subject: [PATCH] gpio-poweroff: Allow it to work on Raspberry Pi
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The Raspberry Pi firmware manages the power-down and reboot
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process. To do this it installs a pm_power_off handler, causing
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the gpio-poweroff module to abort the probe function.
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This patch introduces a "force" DT property that overrides that
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behaviour, and also adds a DT overlay to enable and control it.
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Note that running in an active-low configuration (DT parameter
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"active_low") requires a custom dt-blob.bin and probably won't
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allow a reboot without switching off, so an external inversion
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of the trigger signal may be preferable.
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---
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drivers/power/reset/gpio-poweroff.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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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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@@ -49,9 +49,11 @@ static int gpio_poweroff_probe(struct pl
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{
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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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/* If a pm_power_off function has already been added, leave it alone */
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- if (pm_power_off != NULL) {
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+ force = of_property_read_bool(pdev->dev.of_node, "force");
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+ if (!force && (pm_power_off != NULL)) {
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dev_err(&pdev->dev,
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"%s: pm_power_off function already registered",
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__func__);
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