boards: arm: 96b_stm32_sensor_mez: Enable on-board PWM

Enable PWM channels exposed on 96b_stm32_sensor_mez board via
Arduino connector.

Signed-off-by: Manivannan Sadhasivam <[email protected]>

Author: Mani-Sadhasivam

boards/arm/96b_stm32_sensor_mez/96b_stm32_sensor_mez.dts

@@ -86,6 +86,30 @@
 	status = "ok";
 };
 
+&timers3 {
+	status = "ok";
+
+	pwm {
+		status = "ok";
+	};
+};
+
+&timers4 {
+	status = "ok";
+
+	pwm {
+		status = "ok";
+	};
+};
+
+&timers9 {
+	status = "ok";
+
+	pwm {
+		status = "ok";
+	};
+};
+
 &usart1 {
 	current-speed = <115200>;
 	pinctrl-0 = <&usart1_pins_b>;

boards/arm/96b_stm32_sensor_mez/Kconfig.defconfig

@@ -43,4 +43,17 @@ config SPI_STM32_INTERRUPT
 
 endif # SPI
 
+if PWM
+
+config PWM_STM32_3
+	default y
+
+config PWM_STM32_4
+	default y
+
+config PWM_STM32_9
+	default y
+
+endif # PWM
+
 endif # BOARD_96B_STM32_SENSOR_MEZ

boards/arm/96b_stm32_sensor_mez/doc/96b_stm32_sensor_mez.rst

@@ -71,6 +71,8 @@ hardware features:
 +-----------+------------+-------------------------------------+
 | I2C       | on-chip    | i2c                                 |
 +-----------+------------+-------------------------------------+
+| PWM       | on-chip    | pwm                                 |
++-----------+------------+-------------------------------------+
 
 The default board configuration can be found in the defconfig file:
 
@@ -135,6 +137,18 @@ the LSM6DS3H sensor. The default SPI mapping is:
 - SPI2_MISO : PB14
 - SPI2_MOSI : PB15
 
+PWM
+---
+96Boards STM32 Sensor Mezzanine board exposes 6 PWM channels on the Arduino
+connector. The default PWM mapping is:
+
+- PWM3_CH1  : PB4  : D9
+- PWM3_CH3  : PC8  : D3
+- PWM4_CH3  : PD14 : D6
+- PWM4_CH4  : PD15 : D5
+- PWM9_CH1  : PE5  : D12
+- PWM9_CH2  : PE6  : D11
+
 Programming and Debugging
 *************************
 

boards/arm/96b_stm32_sensor_mez/pinmux.c

@@ -59,6 +59,18 @@ static const struct pin_config pinconf[] = {
 			STM32_OSPEEDR_VERY_HIGH_SPEED},
 	{STM32_PIN_PC1, STM32F4_PINMUX_FUNC_PC1_I2S2_SD},
 #endif	/* CONFIG_I2S_2 */
+#ifdef CONFIG_PWM_STM32_3
+	{ STM32_PIN_PB4, STM32F4_PINMUX_FUNC_PB4_PWM3_CH1 },
+	{ STM32_PIN_PC8, STM32F4_PINMUX_FUNC_PC8_PWM3_CH3 },
+#endif /* CONFIG_PWM_STM32_3 */
+#ifdef CONFIG_PWM_STM32_4
+	{ STM32_PIN_PD14, STM32F4_PINMUX_FUNC_PD14_PWM4_CH3 },
+	{ STM32_PIN_PD15, STM32F4_PINMUX_FUNC_PD15_PWM4_CH4 },
+#endif /* CONFIG_PWM_STM32_4 */
+#ifdef CONFIG_PWM_STM32_9
+	{ STM32_PIN_PE5, STM32F4_PINMUX_FUNC_PE5_PWM9_CH1 },
+	{ STM32_PIN_PE6, STM32F4_PINMUX_FUNC_PE6_PWM9_CH2 },
+#endif /* CONFIG_PWM_STM32_9 */
 };
 
 static int pinmux_stm32_init(struct device *port)