ARM: dts: blanche: Configure pull-up for SOFT_SW and SW25 GPIO keys

The GPIO pins connected to the 4 Software Switches (SW2) and the second
Tact Switch (SW25) 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.

Note that the GPIO pin connected to the first Tact Switch (SW24) does
have an external pull-up resistor.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/011e4c461767f2dd690b655b3dd501eb554184c1.1619785905.git.geert+renesas@glider.be

diff --git a/arch/arm/boot/dts/r8a7792-blanche.dts b/arch/arm/boot/dts/r8a7792-blanche.dts
index c100ae9..62aa9f6 100644 (file)
--- a/arch/arm/boot/dts/r8a7792-blanche.dts
+++ b/arch/arm/boot/dts/r8a7792-blanche.dts
@@ -112,6 +112,9 @@
        keyboard {
                compatible = "gpio-keys";
 
+               pinctrl-0 = <&keyboard_pins>;
+               pinctrl-names = "default";
+
                key-1 {
                        linux,code = <KEY_1>;
                        label = "SW2-1";
@@ -235,6 +238,11 @@
                function = "du1";
        };
 
+       keyboard_pins: keyboard {
+               pins = "GP_3_10", "GP_3_11", "GP_3_12", "GP_3_15", "GP_11_02";
+               bias-pull-up;
+       };
+
        pmic_irq_pins: pmicirq {
                groups = "intc_irq2";
                function = "intc";