mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-28 17:48:58 +00:00
31 lines
1.3 KiB
Diff
31 lines
1.3 KiB
Diff
|
From 81fe79da00f4130ef329d22d6b9433f1ff7f2b6f Mon Sep 17 00:00:00 2001
|
||
|
|
From: Phil Elwell <phil@raspberrypi.com>
|
||
|
|
Date: Mon, 26 Apr 2021 09:58:14 +0100
|
||
|
|
Subject: [PATCH] overlays: README - improve the gpio-poweroff guide
|
||
|
|
|
||
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
|
||
|
|
---
|
||
|
|
arch/arm/boot/dts/overlays/README | 11 +++++++++--
|
||
|
|
1 file changed, 9 insertions(+), 2 deletions(-)
|
||
|
|
|
||
|
|
--- a/arch/arm/boot/dts/overlays/README
|
||
|
|
+++ b/arch/arm/boot/dts/overlays/README
|
||
|
|
@@ -987,8 +987,15 @@ Params: <None>
|
||
|
|
|
||
|
|
|
||
|
|
Name: gpio-poweroff
|
||
|
|
-Info: Drives a GPIO high or low on poweroff (including halt). Enabling this
|
||
|
|
- overlay will prevent the ability to boot by driving GPIO3 low.
|
||
|
|
+Info: Drives a GPIO high or low on poweroff (including halt). Using this
|
||
|
|
+ overlay interferes with the normal power-down sequence, preventing the
|
||
|
|
+ kernel from resetting the SoC (a necessary step in a normal power-off
|
||
|
|
+ or reboot). This also disables the ability to triger a boot by driving
|
||
|
|
+ GPIO3 low.
|
||
|
|
+
|
||
|
|
+ Users of this overlay are required to provide an external mechanism to
|
||
|
|
+ switch off the power supply when signalled - failure to do so results
|
||
|
|
+ in a kernel BUG, increased power consumption and undefined behaviour.
|
||
|
|
Load: dtoverlay=gpio-poweroff,<param>=<val>
|
||
|
|
Params: gpiopin GPIO for signalling (default 26)
|
||
|
|
|