bf28fb50bf
As usual, this patches were taken (and rebased) from https://github.com/raspberrypi/linux/commits/rpi-4.1.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> SVN-Revision: 47258
108 lines
3.8 KiB
Diff
108 lines
3.8 KiB
Diff
From 1e890a091e0fbd61101fac37c8570c414deda17f Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
|
Date: Thu, 25 Jun 2015 12:16:11 +0100
|
|
Subject: [PATCH 087/203] 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__);
|