mips: ocelot: DT: Enable use of serial gpio

This enables the use of the MSCC serial GPIO driver on the MSCC
VCoreIII 'ocelot' SOC, and add gpio-leds nodes to the pcb123 and
pcb120 DT.

Signed-off-by: Lars Povlsen <lars.povlsen@microsemi.com>

arch/mips/dts/mscc,ocelot.dtsi

@@ -37,6 +37,12 @@
 		clock-frequency = <500000000>;
 	};
 
+	sys_clk: sys-clk {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <250000000>;
+	};
+
 	ahb_clk: ahb-clk {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
@@ -118,6 +124,11 @@
 			#gpio-cells = <2>;
 			gpio-ranges = <&gpio 0 0 22>;
 
+			sgpio_pins: sgpio-pins {
+				pins = "GPIO_0", "GPIO_1", "GPIO_2", "GPIO_3";
+				function = "sg0";
+			};
+
 			uart_pins: uart-pins {
 				pins = "GPIO_6", "GPIO_7";
 				function = "uart";
@@ -148,5 +159,17 @@
 				function = "si";
 			};
 		};
+
+		sgpio: gpio@10700f8 {
+			compatible = "mscc,ocelot-sgpio";
+			status = "disabled";
+			clocks = <&sys_clk>;
+			pinctrl-0 = <&sgpio_pins>;
+			pinctrl-names = "default";
+			reg = <0x10700f8 0x100>;
+			gpio-controller;
+			#gpio-cells = <2>;
+			gpio-ranges = <&sgpio 0 0 64>;
+		};
 	};
 };

arch/mips/dts/ocelot_pcb120.dts

@@ -9,4 +9,80 @@
 / {
 	model = "Ocelot PCB120 Reference Board";
 	compatible = "mscc,ocelot-pcb120", "mscc,ocelot";
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		poe_green {
+			label = "pcb120:green:poe";
+			gpios = <&sgpio 44 1>; /* p12.1 */
+			default-state = "off";
+		};
+
+		poe_red {
+			label = "pcb120:red:poe";
+			gpios = <&sgpio 12 1>; /* p12.0 */
+			default-state = "off";
+		};
+
+		alarm_green {
+			label = "pcb120:green:alarm";
+			gpios = <&sgpio 45 1>; /* p13.1 */
+			default-state = "off";
+		};
+
+		alarm_red {
+			label = "pcb120:red:alarm";
+			gpios = <&sgpio 13 1>; /* p13.0 */
+			default-state = "off";
+		};
+
+		dc_a_green {
+			label = "pcb120:green:dc_a";
+			gpios = <&sgpio 46 1>; /* p14.1 */
+			default-state = "off";
+		};
+
+		dc_a_red {
+			label = "pcb120:red:dc_a";
+			gpios = <&sgpio 14 1>; /* p14.0 */
+			default-state = "off";
+		};
+
+		dc_b_green {
+			label = "pcb120:green:dc_b";
+			gpios = <&sgpio 47 1>; /* p15.1 */
+			default-state = "off";
+		};
+
+		dc_b_red {
+			label = "pcb120:red:dc_b";
+			gpios = <&sgpio 15 1>; /* p15.0 */
+			default-state = "off";
+		};
+
+		status_green {
+			label = "pcb120:green:status";
+			gpios = <&sgpio 48 1>; /* p16.1 */
+			default-state = "on";
+		};
+
+		status_red {
+			label = "pcb120:red:alarm";
+			gpios = <&sgpio 16 1>; /* p16.0 */
+			default-state = "off";
+		};
+
+	};
+
 };
+
+&sgpio {
+	status = "okay";
+	mscc,sgpio-ports = <0x000FFFFF>;
+};
+

arch/mips/dts/ocelot_pcb123.dts

@@ -9,4 +9,29 @@
 / {
 	model = "Ocelot PCB123 Reference Board";
 	compatible = "mscc,ocelot-pcb123", "mscc,ocelot";
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		status_green {
+			label = "pcb123:green:status";
+			gpios = <&sgpio 43 1>; /* p11.1 */
+			default-state = "on";
+		};
+
+		status_red {
+			label = "pcb123:red:status";
+			gpios = <&sgpio 11 1>; /* p11.0 */
+			default-state = "off";
+		};
+	};
+};
+
+&sgpio {
+	status = "okay";
+	mscc,sgpio-ports = <0x00FFFFFF>;
 };