ARM: dts: ast2600: Add PWM to device tree

Add the PWM node and enable it for AST2600 EVB

Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
diff --git a/arch/arm/dts/ast2600.dtsi b/arch/arm/dts/ast2600.dtsi
index ce006a3..6407430 100644
--- a/arch/arm/dts/ast2600.dtsi
+++ b/arch/arm/dts/ast2600.dtsi
@@ -113,6 +113,21 @@
 			reg = < 0x1e600000 0x100>;
 		};
 
+		pwm_tach: pwm_tach@1e610000 {
+			compatible = "aspeed,ast2600-pwm-tach", "simple-mfd", "syscon";
+			reg = <0x1e610000 0x100>;
+			clocks = <&scu ASPEED_CLK_AHB>;
+			resets = <&rst ASPEED_RESET_PWM>;
+
+			pwm: pwm {
+				compatible = "aspeed,ast2600-pwm";
+				#pwm-cells = <3>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+				status = "disabled";
+			};
+		};
+
 		fmc: flash-controller@1e620000 {
 			reg = < 0x1e620000 0xc4
 				0x20000000 0x10000000 >;