ARM: dts: koelsch: Configure pull-up for SOFT_SW GPIO keys

The GPIO pins connected to the 4 Software Switches ("SOFT_SW", SW2) do
not have external pull-up resistors, but rely on internal pull-ups being
enabled.  Fortunately this is satisfied by the initial state of these
pins.

Make this explicit by enabling bias-pull-up, to remove the dependency on
initial state and/or boot loader configuration.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20210303132941.3938516-1-geert+renesas@glider.be

diff --git a/arch/arm/boot/dts/r8a7791-koelsch.dts b/arch/arm/boot/dts/r8a7791-koelsch.dts
index e4dbf464c960fb958f8f7e61bb3ebe437cc92579..61e881bbbf6ee5aa7d512252fb4985abbf5cdb83 100644 (file)
--- a/arch/arm/boot/dts/r8a7791-koelsch.dts
+++ b/arch/arm/boot/dts/r8a7791-koelsch.dts
@@ -81,6 +81,9 @@
        keyboard {
                compatible = "gpio-keys";
 
+               pinctrl-0 = <&sw2_pins>;
+               pinctrl-names = "default";
+
                key-1 {
                        gpios = <&gpio5 0 GPIO_ACTIVE_LOW>;
                        linux,code = <KEY_1>;
@@ -618,6 +621,11 @@
                groups = "audio_clk_a";
                function = "audio_clk";
        };
+
+       sw2_pins: sw2 {
+               pins = "GP_5_0", "GP_5_1", "GP_5_2", "GP_5_3";
+               bias-pull-up;
+       };
 };
 
 &ether {