boards: st: nucleo_g431kb: add pwm

Add support for pwm to run the bliky_pwm sample.

Signed-off-by: Klaus Nagel <[email protected]>

boards/st/nucleo_g431kb/doc/index.rst

@@ -51,6 +51,8 @@ The Zephyr nucleo_g431kb board configuration supports the following hardware fea
 +-----------+------------+-------------------------------------+
 | GPIO      | on-chip    | gpio                                |
 +-----------+------------+-------------------------------------+
+| PWM       | on-chip    | pwm                                 |
++-----------+------------+-------------------------------------+
 
 Other hardware features are not yet supported on this Zephyr port.
 
@@ -74,6 +76,7 @@ Default Zephyr Peripheral Mapping:
 - LPUART_1_TX : PA2
 - LPUART_1_RX : PA3
 - LD2 : PB8
+- PWM_4_CH_3 : PB8
 
 System Clock
 ------------
@@ -136,7 +139,7 @@ You should see the following message on the console:
 
 .. code-block:: console
 
-   $ Hello World! arm
+   $ Hello World! nucleo_g431kb/stm32g431xx
 
 
 Debugging

boards/st/nucleo_g431kb/nucleo_g431kb.dts

@@ -28,8 +28,18 @@
 
 	};
 
+	pwmleds {
+		compatible = "pwm-leds";
+
+		green_pwm_led: green_pwm_led {
+			pwms = <&pwm4 3 PWM_MSEC(20) PWM_POLARITY_NORMAL>;
+		};
+	};
+
+
 	aliases {
 		led0 = &green_led;
+		pwm-led0 = &green_pwm_led;
 		watchdog0 = &iwdg;
 	};
 };
@@ -69,6 +79,18 @@
 	status = "okay";
 };
 
+&timers4 {
+	st,prescaler = <10000>;
+	status = "okay";
+
+	pwm4: pwm {
+		status = "okay";
+		pinctrl-0 = <&tim4_ch3_pb8>;
+		pinctrl-names = "default";
+	};
+};
+
+
 &flash0 {
 
 	partitions {