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