boards: bflb: update ai_wb2_12f for PWM

Adds PWM nodes and samples

Signed-off-by: Camille BAUD <mail@massdriver.space>

boards/aithinker/ai_wb2_12f_kit/ai_wb2_12f_kit-pinctrl.dtsi

@@ -23,4 +23,13 @@
 			input-schmitt-enable;
 		};
 	};
+
+	blue_pwm_pinctrl: blue_pwm_pinctrl {
+		group1 {
+			pinmux = <GPIO3_PWM_CH3>;
+			bias-pull-up;
+			input-schmitt-enable;
+			drive-strength = <1>;
+		};
+	};
 };

boards/aithinker/ai_wb2_12f_kit/ai_wb2_12f_kit.dts

@@ -14,6 +14,7 @@
 
 	aliases {
 		led0 = &blue_led;
+		pwm-led0 = &blue_pwm_led;
 		sw0 = &button_0;
 	};
 
@@ -36,6 +37,26 @@
 		};
 	};
 
+	pwmleds: pwmleds {
+		compatible = "pwm-leds";
+		status = "disabled";
+
+		blue_pwm_led: led_pwm_0 {
+			pwms = <&pwm0 3 PWM_MSEC(1) PWM_POLARITY_NORMAL>;
+			label = "Blue - LED0 PWM";
+		};
+
+		green_pwm_led: led_pwm_1 {
+			pwms = <&pwm0 2 PWM_MSEC(1) PWM_POLARITY_NORMAL>;
+			label = "Green - LED1 PWM";
+		};
+
+		red_pwm_led: led_pwm_2 {
+			pwms = <&pwm0 4 PWM_MSEC(1) PWM_POLARITY_NORMAL>;
+			label = "Red - LED2 PWM";
+		};
+	};
+
 	buttons {
 		compatible = "gpio-keys";
 

boards/aithinker/ai_wb2_12f_kit/ai_wb2_12f_kit.yaml

@@ -22,4 +22,5 @@ supported:
   - spi
   - flash
   - input
+  - pwm
 vendor: bflb

samples/basic/blinky_pwm/boards/ai_wb2_12f_kit.overlay

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2025 MASSDRIVER EI (massdriver.space)
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	leds {
+		status = "disabled";
+	};
+};
+
+&pwmleds {
+	status = "okay";
+};
+
+&pwm0 {
+	status = "okay";
+	pinctrl-0 = <&blue_pwm_pinctrl>;
+	pinctrl-names = "default";
+};

samples/basic/fade_led/boards/ai_wb2_12f_kit.overlay

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2025 MASSDRIVER EI (massdriver.space)
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	leds {
+		status = "disabled";
+	};
+};
+
+&pwmleds {
+	status = "okay";
+};
+
+&pwm0 {
+	status = "okay";
+	pinctrl-0 = <&blue_pwm_pinctrl>;
+	pinctrl-names = "default";
+};