ARM: dts: imx7-mba7: Mark gpio-buttons as wakeup-source

I2C expander is capable of generating an IRQ during powersave, so the
attached buttons can be used for waking up the system.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/boot/dts/nxp/imx/imx7-mba7.dtsi b/arch/arm/boot/dts/nxp/imx/imx7-mba7.dtsi
index 2aef830cf1f2347a427c77bf7e6dc4f25537614d..bc5d2e4f0eb1abfe6272ea558ca911d10348d853 100644 (file)
--- a/arch/arm/boot/dts/nxp/imx/imx7-mba7.dtsi
+++ b/arch/arm/boot/dts/nxp/imx/imx7-mba7.dtsi
@@ -32,11 +32,18 @@
        gpio_buttons: gpio-keys {
                compatible = "gpio-keys";
 
+               /*
+                * NOTE: These buttons are attached to a GPIO-expander.
+                * Enabling wakeup-source, enables wakeup on all inputs.
+                * If PE_GPIO[3..6] are used as inputs, they cause a
+                * wakeup as well.
+                */
                button-0 {
                        /* #SWITCH_A */
                        label = "S11";
                        linux,code = <KEY_1>;
                        gpios = <&pca9555 13 GPIO_ACTIVE_LOW>;
+                       wakeup-source;
                };
 
                button-1 {
@@ -44,6 +51,7 @@
                        label = "S12";
                        linux,code = <KEY_2>;
                        gpios = <&pca9555 14 GPIO_ACTIVE_LOW>;
+                       wakeup-source;
                };
 
                button-2 {
@@ -51,6 +59,7 @@
                        label = "S13";
                        linux,code = <KEY_3>;
                        gpios = <&pca9555 15 GPIO_ACTIVE_LOW>;
+                       wakeup-source;
                };
        };