109 lines
3.8 KiB
Diff
109 lines
3.8 KiB
Diff
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From 842fe412d512dabb76d169395086b6337150015a Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Thu, 25 Jun 2015 12:16:11 +0100
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Subject: [PATCH 087/121] gpio-poweroff: Allow it to work on Raspberry Pi
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The Raspberry Pi firmware manages the power-down and reboot
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process. To do this it installs a pm_power_off handler, causing
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the gpio-poweroff module to abort the probe function.
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This patch introduces a "force" DT property that overrides that
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behaviour, and also adds a DT overlay to enable and control it.
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Note that running in an active-low configuration (DT parameter
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"active_low") requires a custom dt-blob.bin and probably won't
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allow a reboot without switching off, so an external inversion
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of the trigger signal may be preferable.
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 13 +++++++++
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.../boot/dts/overlays/gpio-poweroff-overlay.dts | 34 ++++++++++++++++++++++
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drivers/power/reset/gpio-poweroff.c | 4 ++-
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4 files changed, 51 insertions(+), 1 deletion(-)
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create mode 100644 arch/arm/boot/dts/overlays/gpio-poweroff-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -16,6 +16,7 @@ dtb-$(RPI_DT_OVERLAYS) += ads7846-overla
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dtb-$(RPI_DT_OVERLAYS) += bmp085_i2c-sensor-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += dht11-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += enc28j60-overlay.dtb
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+dtb-$(RPI_DT_OVERLAYS) += gpio-poweroff-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += hifiberry-amp-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += hifiberry-dac-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += hifiberry-dacplus-overlay.dtb
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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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@@ -192,6 +192,19 @@ Params: int_pin GPIO us
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speed SPI bus speed (default 12000000)
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+Name: gpio-poweroff
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+Info: Drives a GPIO high or low on reboot
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+Load: gpio-poweroff,<param>=<val>
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+Params: gpiopin GPIO for signalling (default 26)
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+
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+ active_low Set if the power control device requires a
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+ high->low transition to trigger a power-down.
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+ Note that this will require the support of a
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+ custom dt-blob.bin to prevent a power-down
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+ during the boot process, and that a reboot
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+ will also cause the pin to go low.
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+
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+
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Name: hifiberry-amp
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Info: Configures the HifiBerry Amp and Amp+ audio cards
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Load: dtoverlay=hifiberry-amp
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/gpio-poweroff-overlay.dts
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@@ -0,0 +1,34 @@
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+// Definitions for gpio-poweroff module
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2708";
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+
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+ fragment@0 {
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+ target-path = "/";
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+ __overlay__ {
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+ power_ctrl: power_ctrl {
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+ compatible = "gpio-poweroff";
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+ gpios = <&gpio 26 0>;
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+ force;
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+ };
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ power_ctrl_pins: power_ctrl_pins {
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+ brcm,pins = <26>;
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+ brcm,function = <1>; // out
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+ };
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+ };
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+ };
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+
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+ __overrides__ {
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+ gpiopin = <&power_ctrl>,"gpios:4",
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+ <&power_ctrl_pins>,"brcm,pins:0";
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+ active_low = <&power_ctrl>,"gpios:8";
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+ };
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+};
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--- a/drivers/power/reset/gpio-poweroff.c
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+++ b/drivers/power/reset/gpio-poweroff.c
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@@ -48,9 +48,11 @@ static void gpio_poweroff_do_poweroff(vo
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static int gpio_poweroff_probe(struct platform_device *pdev)
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{
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bool input = false;
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+ bool force = false;
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/* If a pm_power_off function has already been added, leave it alone */
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- if (pm_power_off != NULL) {
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+ force = of_property_read_bool(pdev->dev.of_node, "force");
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+ if (!force && (pm_power_off != NULL)) {
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dev_err(&pdev->dev,
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"%s: pm_power_off function already registered",
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__func__);
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