nano_matter: add PWM support

Author: silabs-bozont

variants/arduino_nano_matter_mgm240sd22vna/arduino_nano_matter_mgm240sd22vna.conf

@@ -8,3 +8,4 @@ CONFIG_BT_HCI_TX_STACK_SIZE=4096
 
 CONFIG_FPU=y
 CONFIG_I2C=y
+CONFIG_PWM=y

variants/arduino_nano_matter_mgm240sd22vna/arduino_nano_matter_mgm240sd22vna.overlay

@@ -43,6 +43,18 @@
 				<&gpioc 4 0>, /* 26 Serial Tx */
 				<&gpioc 5 0>; /* 27 Serial Rx */
 
+		builtin-led-gpios = <&gpioc 1 GPIO_ACTIVE_LOW>, /* 22 LED R */
+							<&gpioc 2 GPIO_ACTIVE_LOW>, /* 23 LED G */
+							<&gpioc 3 GPIO_ACTIVE_LOW>; /* 24 LED B */
+
+		pwm-pin-gpios =	<&gpiob 0 0>, /* A0 */
+						<&gpiob 2 0>, /* A1 */
+						<&gpiob 5 0>; /* A2 */
+
+		pwms = <&timer0_pwm 0 255 PWM_POLARITY_INVERTED>,
+				<&timer0_pwm 1 255 PWM_POLARITY_INVERTED>,
+				<&timer0_pwm 2 255 PWM_POLARITY_INVERTED>;
+
 		builtin-led-gpios = <&gpioc 1 0>;
 		serials = <&usart0>;
 		i2cs = <&i2c0>;
@@ -55,3 +67,23 @@
 	clock-frequency = <I2C_BITRATE_STANDARD>;
 	status = "okay";
 };
+
+&timer0 {
+	status = "okay";
+
+	timer0_pwm: pwm {
+		pinctrl-0 = <&timer0_default>;
+		pinctrl-names = "default";
+		status = "okay";
+	};
+};
+
+&pinctrl {
+	timer0_default: timer0_default {
+		group0 {
+			pins = <TIMER0_CC0_PB0>, <TIMER0_CC1_PB2>, <TIMER0_CC2_PB5>;
+			drive-push-pull;
+			output-high;
+		};
+	};
+};

variants/arduino_nano_matter_mgm240sd22vna/variant.h

@@ -6,3 +6,10 @@
 #define SS      10
 #define SDA     4
 #define SCL     5
+
+#define LED_BUILTIN_1 23
+#define LED_BUILTIN_2 24
+#define LED_BUILTIN_ACTIVE (LOW)
+#define LED_BUILTIN_INACTIVE (!LED_BUILTIN_ACTIVE)
+
+#define BTN_BUILTIN 25