diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.1/0087-gpio-poweroff-Allow-it-to-work-on-Raspberry-Pi.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.1/0087-gpio-poweroff-Allow-it-to-work-on-Raspberry-Pi.patch | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.1/0087-gpio-poweroff-Allow-it-to-work-on-Raspberry-Pi.patch b/target/linux/brcm2708/patches-4.1/0087-gpio-poweroff-Allow-it-to-work-on-Raspberry-Pi.patch new file mode 100644 index 0000000..9d65e34 --- /dev/null +++ b/target/linux/brcm2708/patches-4.1/0087-gpio-poweroff-Allow-it-to-work-on-Raspberry-Pi.patch @@ -0,0 +1,108 @@ +From 842fe412d512dabb76d169395086b6337150015a Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.org> +Date: Thu, 25 Jun 2015 12:16:11 +0100 +Subject: [PATCH 087/121] gpio-poweroff: Allow it to work on Raspberry Pi + +The Raspberry Pi firmware manages the power-down and reboot +process. To do this it installs a pm_power_off handler, causing +the gpio-poweroff module to abort the probe function. + +This patch introduces a "force" DT property that overrides that +behaviour, and also adds a DT overlay to enable and control it. + +Note that running in an active-low configuration (DT parameter +"active_low") requires a custom dt-blob.bin and probably won't +allow a reboot without switching off, so an external inversion +of the trigger signal may be preferable. +--- + arch/arm/boot/dts/overlays/Makefile | 1 + + arch/arm/boot/dts/overlays/README | 13 +++++++++ + .../boot/dts/overlays/gpio-poweroff-overlay.dts | 34 ++++++++++++++++++++++ + drivers/power/reset/gpio-poweroff.c | 4 ++- + 4 files changed, 51 insertions(+), 1 deletion(-) + create mode 100644 arch/arm/boot/dts/overlays/gpio-poweroff-overlay.dts + +--- a/arch/arm/boot/dts/overlays/Makefile ++++ b/arch/arm/boot/dts/overlays/Makefile +@@ -16,6 +16,7 @@ dtb-$(RPI_DT_OVERLAYS) += ads7846-overla + dtb-$(RPI_DT_OVERLAYS) += bmp085_i2c-sensor-overlay.dtb + dtb-$(RPI_DT_OVERLAYS) += dht11-overlay.dtb + dtb-$(RPI_DT_OVERLAYS) += enc28j60-overlay.dtb ++dtb-$(RPI_DT_OVERLAYS) += gpio-poweroff-overlay.dtb + dtb-$(RPI_DT_OVERLAYS) += hifiberry-amp-overlay.dtb + dtb-$(RPI_DT_OVERLAYS) += hifiberry-dac-overlay.dtb + dtb-$(RPI_DT_OVERLAYS) += hifiberry-dacplus-overlay.dtb +--- a/arch/arm/boot/dts/overlays/README ++++ b/arch/arm/boot/dts/overlays/README +@@ -192,6 +192,19 @@ Params: int_pin GPIO us + speed SPI bus speed (default 12000000) + + ++Name: gpio-poweroff ++Info: Drives a GPIO high or low on reboot ++Load: gpio-poweroff,<param>=<val> ++Params: gpiopin GPIO for signalling (default 26) ++ ++ active_low Set if the power control device requires a ++ high->low transition to trigger a power-down. ++ Note that this will require the support of a ++ custom dt-blob.bin to prevent a power-down ++ during the boot process, and that a reboot ++ will also cause the pin to go low. ++ ++ + Name: hifiberry-amp + Info: Configures the HifiBerry Amp and Amp+ audio cards + Load: dtoverlay=hifiberry-amp +--- /dev/null ++++ b/arch/arm/boot/dts/overlays/gpio-poweroff-overlay.dts +@@ -0,0 +1,34 @@ ++// Definitions for gpio-poweroff module ++/dts-v1/; ++/plugin/; ++ ++/ { ++ compatible = "brcm,bcm2708"; ++ ++ fragment@0 { ++ target-path = "/"; ++ __overlay__ { ++ power_ctrl: power_ctrl { ++ compatible = "gpio-poweroff"; ++ gpios = <&gpio 26 0>; ++ force; ++ }; ++ }; ++ }; ++ ++ fragment@1 { ++ target = <&gpio>; ++ __overlay__ { ++ power_ctrl_pins: power_ctrl_pins { ++ brcm,pins = <26>; ++ brcm,function = <1>; // out ++ }; ++ }; ++ }; ++ ++ __overrides__ { ++ gpiopin = <&power_ctrl>,"gpios:4", ++ <&power_ctrl_pins>,"brcm,pins:0"; ++ active_low = <&power_ctrl>,"gpios:8"; ++ }; ++}; +--- a/drivers/power/reset/gpio-poweroff.c ++++ b/drivers/power/reset/gpio-poweroff.c +@@ -48,9 +48,11 @@ static void gpio_poweroff_do_poweroff(vo + static int gpio_poweroff_probe(struct platform_device *pdev) + { + bool input = false; ++ bool force = false; + + /* If a pm_power_off function has already been added, leave it alone */ +- if (pm_power_off != NULL) { ++ force = of_property_read_bool(pdev->dev.of_node, "force"); ++ if (!force && (pm_power_off != NULL)) { + dev_err(&pdev->dev, + "%s: pm_power_off function already registered", + __func__); |