dts: nrf: PWM device node added to nRF52 devices with yaml binding

1. PWM device node added with alias to all
   nRF52x DTSI files. 1 instance for
   nRF52810, 3 instances for nRF52832, and
   4 instance for nRF52840.
2. Added yaml binding for Nordic PWM node.

Signed-off-by: Gaute Gamnes <gaute.gamnes@nordicsemi.no>

dts/arm/nordic/nrf52810.dtsi

@@ -43,6 +43,7 @@
 		gpio-0 = &gpio0;
 		gpiote-0 = &gpiote;
 		wdt-0 = &wdt;
+		pwm-0 = &pwm0;
 		qdec-0 = &qdec;
 	};
 
@@ -92,6 +93,14 @@
 			label = "I2C_0";
 		};
 
+		pwm0: pwm@4001C000 {
+			compatible = "nordic,nrf-pwm";
+			reg = <0x4001C000 0x1000>;
+			interrupts = <28 1>;
+			status = "disabled";
+			label = "PWM_0";
+		};
+
 		qdec: qdec@40012000 {
 			compatible = "nordic,nrf-qdec";
 			reg = <0x40012000 0x1000>;

dts/arm/nordic/nrf52832.dtsi

@@ -47,6 +47,9 @@
 		gpio-0 = &gpio0;
 		gpiote-0 = &gpiote;
 		wdt-0 = &wdt;
+		pwm-0 = &pwm0;
+		pwm-1 = &pwm1;
+		pwm-2 = &pwm2;
 		qdec-0 = &qdec;
 	};
 
@@ -108,6 +111,30 @@
 			label = "I2C_1";
 		};
 
+		pwm0: pwm@4001C000 {
+			compatible = "nordic,nrf-pwm";
+			reg = <0x4001C000 0x1000>;
+			interrupts = <28 1>;
+			status = "disabled";
+			label = "PWM_0";
+		};
+
+		pwm1: pwm@40021000 {
+			compatible = "nordic,nrf-pwm";
+			reg = <0x40021000 0x1000>;
+			interrupts = <33 1>;
+			status = "disabled";
+			label = "PWM_1";
+		};
+
+		pwm2: pwm@40022000 {
+			compatible = "nordic,nrf-pwm";
+			reg = <0x40022000 0x1000>;
+			interrupts = <34 1>;
+			status = "disabled";
+			label = "PWM_2";
+		};
+
 		qdec: qdec@40012000 {
 			compatible = "nordic,nrf-qdec";
 			reg = <0x40012000 0x1000>;

dts/arm/nordic/nrf52840.dtsi

@@ -53,6 +53,10 @@
 		usbd-0 = &usbd;
 		cc310 = &cryptocell;
 		arm-cryptocell-310 = &cryptocell310;
+		pwm-0 = &pwm0;
+		pwm-1 = &pwm1;
+		pwm-2 = &pwm2;
+		pwm-3 = &pwm3;
 		qdec-0 = &qdec;
 	};
 
@@ -132,6 +136,38 @@
 			label = "I2C_1";
 		};
 
+		pwm0: pwm@4001C000 {
+			compatible = "nordic,nrf-pwm";
+			reg = <0x4001C000 0x1000>;
+			interrupts = <28 1>;
+			status = "disabled";
+			label = "PWM_0";
+		};
+
+		pwm1: pwm@40021000 {
+			compatible = "nordic,nrf-pwm";
+			reg = <0x40021000 0x1000>;
+			interrupts = <33 1>;
+			status = "disabled";
+			label = "PWM_1";
+		};
+
+		pwm2: pwm@40022000 {
+			compatible = "nordic,nrf-pwm";
+			reg = <0x40022000 0x1000>;
+			interrupts = <34 1>;
+			status = "disabled";
+			label = "PWM_2";
+		};
+
+		pwm3: pwm@4002D000 {
+			compatible = "nordic,nrf-pwm";
+			reg = <0x4002D000 0x1000>;
+			interrupts = <45 1>;
+			status = "disabled";
+			label = "PWM_3";
+		};
+
 		qdec: qdec@40012000 {
 			compatible = "nordic,nrf-qdec";
 			reg = <0x40012000 0x1000>;

dts/bindings/pwm/nordic,nrf-pwm.yaml

@@ -0,0 +1,71 @@
+---
+title: nRF PWM
+version: 0.1
+
+description: >
+    This binding gives a base representation of the nRF PWM
+
+properties:
+    compatible:
+      constraint: "nordic,nrf-pwm"
+
+    reg:
+      type: array
+      description: mmio register space
+      generation: define
+      category: required
+
+    label:
+      type: string
+      category: required
+      description: Human readable string describing the device (used by Zephyr for API name)
+      generation: define
+
+    ch0-pin:
+      type: int
+      description: Channel 0 pin
+      category: optional
+      generation: define
+
+    ch0-inverted:
+      type: boolean
+      description: Channel 0 inverted
+      category: optional
+      generation: define
+
+    ch1-pin:
+      type: int
+      description: Channel 1 pin
+      category: optional
+      generation: define
+
+    ch1-inverted:
+      type: boolean
+      description: Channel 1 inverted
+      category: optional
+      generation: define
+
+    ch2-pin:
+      type: int
+      description: Channel 2 pin
+      category: optional
+      generation: define
+
+    ch2-inverted:
+      type: boolean
+      description: Channel 2 inverted
+      category: optional
+      generation: define
+
+    ch3-pin:
+      type: int
+      description: Channel 3 pin
+      category: optional
+      generation: define
+
+    ch3-inverted:
+      type: boolean
+      description: Channel 3 inverted
+      category: optional
+      generation: define
+...