arm64: dts: mediatek: mt6795: Add pinctrl controller node

Add a node for the pinctrl controller found on MT6795 but without
configuration for any pin, as that's expected to be done in the
machine-specific devicetrees.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220609112303.117928-10-angelogioacchino.delregno@collabora.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt6795.dtsi

@@ -13,6 +13,7 @@
 
 #include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/pinctrl/mt6795-pinfunc.h>
 
 / {
 	compatible = "mediatek,mt6795";
@@ -198,6 +199,19 @@ soc {
 		compatible = "simple-bus";
 		ranges;
 
+		pio: pinctrl@10005000 {
+			compatible = "mediatek,mt6795-pinctrl";
+			reg = <0 0x10005000 0 0x1000>, <0 0x1000b000 0 0x1000>;
+			reg-names = "base", "eint";
+			interrupts = <GIC_SPI 153 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 154 IRQ_TYPE_LEVEL_HIGH>;
+			gpio-controller;
+			#gpio-cells = <2>;
+			gpio-ranges = <&pio 0 0 196>;
+			interrupt-controller;
+			#interrupt-cells = <2>;
+		};
+
 		watchdog: watchdog@10007000 {
 			compatible = "mediatek,mt6795-wdt";
 			reg = <0 0x10007000 0 0x100>;