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

The GPIO pins connected to the 4 Software Switches ("SOFT_SW", SW12) 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.

While at it, rename the surrounding device node from "gpio-keys" to
"keyboard", to comply with generic node name recommendations.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/45f38a5333feba9bea80efeb5a41a6c3f60deda2.1619785905.git.geert+renesas@glider.be

diff --git a/arch/arm/boot/dts/r8a7794-silk.dts b/arch/arm/boot/dts/r8a7794-silk.dts
index eb89a27..cafa304 100644 (file)
--- a/arch/arm/boot/dts/r8a7794-silk.dts
+++ b/arch/arm/boot/dts/r8a7794-silk.dts
@@ -45,9 +45,12 @@
                reg = <0 0x40000000 0 0x40000000>;
        };
 
-       gpio-keys {
+       keyboard {
                compatible = "gpio-keys";
 
+               pinctrl-0 = <&keyboard_pins>;
+               pinctrl-names = "default";
+
                key-3 {
                        gpios = <&gpio5 10 GPIO_ACTIVE_LOW>;
                        linux,code = <KEY_3>;
@@ -358,6 +361,11 @@
                function = "du1";
        };
 
+       keyboard_pins: keyboard {
+               pins = "GP_3_9", "GP_3_10", "GP_3_11", "GP_3_12";
+               bias-pull-up;
+       };
+
        ssi_pins: sound {
                groups = "ssi0129_ctrl", "ssi0_data", "ssi1_data";
                function = "ssi";