riscv: dts: spacemit: add gpio support for K1 SoC

Populate the GPIO node in the device tree for SpacemiT K1 SoC.
Each of 32 pins will act as one bank and map pins to pinctrl controller.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Yixun Lan <[email protected]>

Author: dlan17

arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi

@@ -7,6 +7,9 @@
 
 #define K1_PADCONF(pin, func) (((pin) << 16) | (func))
 
+/* Map GPIO pin to each bank's <index, offset> */
+#define K1_GPIO(x)	(x / 32) (x % 32)
+
 &pinctrl {
 	uart0_2_cfg: uart0-2-cfg {
 		uart0-2-pins {

arch/riscv/boot/dts/spacemit/k1.dtsi

@@ -465,6 +465,24 @@
 			status = "disabled";
 		};
 
+		gpio: gpio@d4019000 {
+			compatible = "spacemit,k1-gpio";
+			reg = <0x0 0xd4019000 0x0 0x100>;
+			clocks = <&syscon_apbc CLK_GPIO>,
+				 <&syscon_apbc CLK_GPIO_BUS>;
+			clock-names = "core", "bus";
+			gpio-controller;
+			#gpio-cells = <3>;
+			interrupts = <58>;
+			interrupt-parent = <&plic>;
+			interrupt-controller;
+			#interrupt-cells = <3>;
+			gpio-ranges = <&pinctrl 0 0 0 32>,
+				      <&pinctrl 1 0 32 32>,
+				      <&pinctrl 2 0 64 32>,
+				      <&pinctrl 3 0 96 32>;
+		};
+
 		pinctrl: pinctrl@d401e000 {
 			compatible = "spacemit,k1-pinctrl";
 			reg = <0x0 0xd401e000 0x0 0x400>;