From 84cd61bdf5fe5ecf70ad88e60e07879cbde2d4a6 Mon Sep 17 00:00:00 2001 From: Phil Elwell 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 @@ -51,9 +51,11 @@ 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__);