blob: 13b2b4be9abbeefbcb6448b11544a93c83bbdccf (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
From e1bd8231e59c90e284ddfcd9380792b40f775b1d 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__);
|
