Add dts file for PWM

red/misc/sun7i-a20-pwm.dts

@@ -0,0 +1,36 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "allwinner,sun7i-a20";
+	description = "Enable PWM controller";
+
+	fragment@0 {
+		target = <&pio>;
+		__overlay__ {
+			pwm0_pin: pwm0-pin {
+				pins = "PB2";
+				function = "pwm";
+			};
+		};
+	};
+
+        fragment@1 {
+                target = <&pio>;
+                __overlay__ {
+                        pwm1_pin: pwm1-pin {
+                                pins = "PI3";
+                                function = "pwm";
+                        };
+                };
+        };
+
+	fragment@2 {
+		target = <&pwm>;
+		__overlay__ {
+			pinctrl-names = "default";
+			pinctrl-0 = <&pwm0_pin>, <&pwm1_pin>;
+			status = "okay";
+		};
+	};
+};