boards: nucleo_wba55cg: Add timer3 and pwmleds configuration

Added timer3 and pwmleds configuration to the nucleo_wba55cg board DTS
file. This includes setting the prescaler, enabling the pwm3 node with the
appropriate pin control settings, and configuring the pwmleds node with
green_pwm_led.

Signed-off-by: Lubos Koudelka <[email protected]>

Author: lkoudelka

boards/st/nucleo_wba55cg/nucleo_wba55cg.dts

@@ -43,6 +43,14 @@
 		};
 	};
 
+	pwmleds: pwmleds {
+		compatible = "pwm-leds";
+
+		green_pwm_led: green_pwm_led {
+			pwms = <&pwm3 2 PWM_MSEC(20) PWM_POLARITY_NORMAL>;
+		};
+	};
+
 	gpio_keys {
 		compatible = "gpio-keys";
 		user_button_1: button_0 {
@@ -66,6 +74,7 @@
 		led0 = &blue_led_1;
 		led1 = &green_led_2;
 		led2 = &red_led_3;
+		pwm-led0 = &green_pwm_led;
 		sw0 = &user_button_1;
 		sw1 = &user_button_2;
 		sw2 = &user_button_3;
@@ -166,6 +175,17 @@
 	status = "okay";
 };
 
+&timers3 {
+	st,prescaler = <10000>;
+	status = "okay";
+
+	pwm3: pwm {
+		status = "okay";
+		pinctrl-0 = <&tim3_ch2_pa9>;
+		pinctrl-names = "default";
+	};
+};
+
 stm32_lp_tick_source: &lptim1 {
 	clocks = <&rcc STM32_CLOCK_BUS_APB7 0x00000800>,
 		 <&rcc STM32_SRC_LSE LPTIM1_SEL(3)>;