Describe the pin controller for Loongson 2K0300 SoC. As default settings
for the existing UARTs, pinctrls are added and multiplexed to pins taken
corresponding UART as main functionaility.

Signed-off-by: Yao Zi <ziyao@disroot.org>
---
 arch/loongarch/boot/dts/loongson-2k0300.dtsi | 39 ++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/arch/loongarch/boot/dts/loongson-2k0300.dtsi b/arch/loongarch/boot/dts/loongson-2k0300.dtsi
index d909a4eca312..a8ad8bd43f5d 100644
--- a/arch/loongarch/boot/dts/loongson-2k0300.dtsi
+++ b/arch/loongarch/boot/dts/loongson-2k0300.dtsi
@@ -9,6 +9,8 @@
 #include <dt-bindings/clock/loongson,ls2k0300-clk.h>
 #include <dt-bindings/interrupt-controller/irq.h>
 
+#define PINMUX(pin, func)	(((pin) << 8) | func)
+
 / {
 	compatible = "loongson,ls2k0300";
 	#address-cells = <2>;
@@ -55,6 +57,35 @@ clk: clock-controller@16000400 {
 			#clock-cells = <1>;
 		};
 
+		pinctrl: pinctrl@16000490 {
+			compatible = "loongson,ls2k0300-pinctrl";
+			reg = <0x0 0x16000490 0x0 0x20>,
+			      <0x0 0x16000110 0x0 0x4>;
+			reg-names = "mux", "drive";
+
+			func-uart {
+				uart0_pins: uart0-pins {
+					pinmux = <PINMUX(40, 0x3)>,
+						 <PINMUX(41, 0x3)>;
+				};
+
+				uart1_pins: uart1-pins {
+					pinmux = <PINMUX(42, 0x3)>,
+						 <PINMUX(43, 0x3)>;
+				};
+
+				uart2_pins: uart2-pins {
+					pinmux = <PINMUX(44, 0x3)>,
+						 <PINMUX(45, 0x3)>;
+				};
+
+				uart3_pins: uart3-pins {
+					pinmux = <PINMUX(46, 0x3)>,
+						 <PINMUX(47, 0x3)>;
+				};
+			};
+		};
+
 		liointc0: interrupt-controller@16001400 {
 			compatible = "loongson,liointc-2.0";
 			reg = <0x0 0x16001400 0x0 0x40>,
@@ -100,6 +131,8 @@ uart0: serial@16100000 {
 			interrupt-parent = <&liointc0>;
 			interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
 			no-loopback-test;
+			pinctrl-names = "default";
+			pinctrl-0 = <&uart0_pins>;
 			status = "disabled";
 		};
 
@@ -109,6 +142,8 @@ uart1: serial@16100400 {
 			interrupt-parent = <&liointc0>;
 			interrupts = <1 IRQ_TYPE_LEVEL_HIGH>;
 			no-loopback-test;
+			pinctrl-names = "default";
+			pinctrl-0 = <&uart1_pins>;
 			status = "disabled";
 		};
 
@@ -118,6 +153,8 @@ uart2: serial@16100800 {
 			interrupt-parent = <&liointc0>;
 			interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
 			no-loopback-test;
+			pinctrl-names = "default";
+			pinctrl-0 = <&uart2_pins>;
 			status = "disabled";
 		};
 
@@ -127,6 +164,8 @@ uart3: serial@16100c00 {
 			interrupt-parent = <&liointc0>;
 			interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
 			no-loopback-test;
+			pinctrl-names = "default";
+			pinctrl-0 = <&uart3_pins>;
 			status = "disabled";
 		};
 
-- 
2.50.1