From ae5bd19ff96560fb75a75c7d2374bed60bbd9669 Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Thu, 11 Nov 2021 10:24:02 +0000 Subject: [PATCH] overlays: Additional parameters for gpio-poweroff The gpio-poweroff driver supports active-delay-ms and inactive-delay-ms properties. Add parameters to set these parameters - active_delay_ms and inactive_delay_ms. See: https://forums.raspberrypi.com/viewtopic.php?t=323508 Signed-off-by: Phil Elwell --- arch/arm/boot/dts/overlays/README | 7 +++++++ arch/arm/boot/dts/overlays/gpio-poweroff-overlay.dts | 2 ++ 2 files changed, 9 insertions(+) --- a/arch/arm/boot/dts/overlays/README +++ b/arch/arm/boot/dts/overlays/README @@ -1155,6 +1155,11 @@ Info: Drives a GPIO high or low on pow or reboot). This also disables the ability to trigger a boot by driving GPIO3 low. + The GPIO starts in an inactive state. At poweroff time it is driven + active for 100ms, then inactive for 100ms, then active again. It is + safe to remove the power at any point after the initial activation of + the GPIO. + 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. @@ -1170,6 +1175,8 @@ Params: gpiopin GPIO for input Set if the gpio pin should be configured as an input. export Set to export the configured pin to sysfs + active_delay_ms Initial GPIO active period (default 100) + inactive_delay_ms Subsequent GPIO inactive period (default 100) timeout_ms Specify (in ms) how long the kernel waits for power-down before issuing a WARN (default 3000). --- a/arch/arm/boot/dts/overlays/gpio-poweroff-overlay.dts +++ b/arch/arm/boot/dts/overlays/gpio-poweroff-overlay.dts @@ -33,5 +33,7 @@ input = <&power_ctrl>,"input?"; export = <&power_ctrl>,"export?"; timeout_ms = <&power_ctrl>,"timeout-ms:0"; + active_delay_ms = <&power_ctrl>,"active-delay-ms:0"; + inactive_delay_ms = <&power_ctrl>,"inactive-delay-ms:0"; }; };