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- From 1ad569f9f83546073951ea911702cf3cb18affe3 Mon Sep 17 00:00:00 2001
- From: Phil Elwell <phil@raspberrypi.org>
- Date: Thu, 25 Jun 2015 12:16:11 +0100
- Subject: [PATCH] gpio-poweroff: Allow it to work on Raspberry Pi
- The Raspberry Pi firmware manages the power-down and reboot
- process. To do this it installs a pm_power_off handler, causing
- the gpio-poweroff module to abort the probe function.
- This patch introduces a "force" DT property that overrides that
- behaviour, and also adds a DT overlay to enable and control it.
- Note that running in an active-low configuration (DT parameter
- "active_low") requires a custom dt-blob.bin and probably won't
- allow a reboot without switching off, so an external inversion
- of the trigger signal may be preferable.
- ---
- drivers/power/reset/gpio-poweroff.c | 4 +++-
- 1 file changed, 3 insertions(+), 1 deletion(-)
- --- a/drivers/power/reset/gpio-poweroff.c
- +++ b/drivers/power/reset/gpio-poweroff.c
- @@ -49,9 +49,11 @@ static int gpio_poweroff_probe(struct pl
- {
- bool input = false;
- enum gpiod_flags flags;
- + bool force = false;
-
- /* If a pm_power_off function has already been added, leave it alone */
- - if (pm_power_off != NULL) {
- + force = of_property_read_bool(pdev->dev.of_node, "force");
- + if (!force && (pm_power_off != NULL)) {
- dev_err(&pdev->dev,
- "%s: pm_power_off function already registered",
- __func__);
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