diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.10/950-0589-overlays-README-improve-the-gpio-poweroff-guide.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.10/950-0589-overlays-README-improve-the-gpio-poweroff-guide.patch | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.10/950-0589-overlays-README-improve-the-gpio-poweroff-guide.patch b/target/linux/bcm27xx/patches-5.10/950-0589-overlays-README-improve-the-gpio-poweroff-guide.patch new file mode 100644 index 0000000000..bf0be953ce --- /dev/null +++ b/target/linux/bcm27xx/patches-5.10/950-0589-overlays-README-improve-the-gpio-poweroff-guide.patch @@ -0,0 +1,30 @@ +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) + |