ARM: dts: imx6qdl-udoo: add support for powering off

UDOO board has a possibility to disable most of imx6 SoC power supplies via
"EN_5V" signal, which is connected to "NANDF_D4" pad.

This reduces current consumption after shutdown from ~350 mA to ~40 mA and
prevents a SoC watchdog from starting it again on its own after the
watchdog timeout expires (previously it was not possible to shut down the
SoC permanently if its watchdog was ever enabled since it was still ticking
after the shutdown).

Unfortunately, this does not extinguish the "Power" LED (as it is powered
from an always-on voltage regulator).

To power the SoC up again press the power button (SW2, the one with a long
shaft).

Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/boot/dts/imx6qdl-udoo.dtsi b/arch/arm/boot/dts/imx6qdl-udoo.dtsi
index 839282c55701550c813d90f8cbe34880a334973c..4161b7d4323a30da02076c791d5201d3cc19dc2c 100644 (file)
--- a/arch/arm/boot/dts/imx6qdl-udoo.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-udoo.dtsi
@@ -28,6 +28,13 @@ backlight: backlight {
                status = "disabled";
        };
 
+       gpio-poweroff {
+               compatible = "gpio-poweroff";
+               gpios = <&gpio2 4 0>;
+               pinctrl-0 = <&pinctrl_power_off>;
+               pinctrl-names = "default";
+       };
+
        memory {
                reg = <0x10000000 0x40000000>;
        };
@@ -172,6 +179,12 @@ MX6QDL_PAD_GPIO_4__GPIO1_IO04              0x70
                        >;
                };
 
+               pinctrl_power_off: poweroffgrp {
+                       fsl,pins = <
+                               MX6QDL_PAD_NANDF_D4__GPIO2_IO04         0x30
+                       >;
+               };
+
                pinctrl_touchscreenp7: touchscreenp7grp {
                        fsl,pins = <
                                MX6QDL_PAD_SD2_DAT0__GPIO1_IO15         0x70