openwrtv3/target/linux/brcm2708/patches-4.4/0080-gpio-poweroff-Allow-it-to-work-on-Raspberry-Pi.patch
Álvaro Fernández Rojas 525b311bf8 brcm2708: update linux 4.4 patches to latest version
As usual these patches were extracted from the raspberry pi repo:
https://github.com/raspberrypi/linux/tree/rpi-4.4.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
2016-04-24 13:03:39 +02:00

35 lines
1.4 KiB
Diff

From 328a04523323650c59fef1657143e87513c79751 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Thu, 25 Jun 2015 12:16:11 +0100
Subject: [PATCH 080/304] 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__);