boards: arm: stm32l562e_dk: Enabling PWM support in device tree

This commit enables PWM support for stm32l562e_dk platform in
device tree.

Signed-off-by: Sidhdharth Yadav <sidhdharth.yadav@hcl.com>

boards/arm/stm32l562e_dk/doc/index.rst

@@ -170,6 +170,8 @@ The Zephyr stm32l562e_dk board configuration supports the following hardware fea
 +-----------+------------+-------------------------------------+
 | RNG       | on-chip    | True Random Number Generator        |
 +-----------+------------+-------------------------------------+
+| PWM       | on-chip    | PWM                                 |
++-----------+------------+-------------------------------------+
 
 Other hardware features are not yet supported on this Zephyr port.
 
@@ -193,6 +195,7 @@ Default Zephyr Peripheral Mapping:
 - SPI_1 SCK/MISO/MOSI : PG2/PG3/PG4 (BT SPI bus)
 - USER_PB : PC13
 - LD10 : PG12
+- PWM_2_CH1 : PA0
 
 System Clock
 ------------

boards/arm/stm32l562e_dk/stm32l562e_dk.dts

@@ -38,3 +38,9 @@
 &lptim1 {
 	status = "okay";
 };
+
+&timers2 {
+	pwm {
+		st,prescaler = <10000>;
+	};
+};

boards/arm/stm32l562e_dk/stm32l562e_dk.yaml

@@ -10,5 +10,6 @@ supported:
   - i2c
   - lsm6dso
   - lptim
+  - pwm
 ram: 192
 flash: 512

boards/arm/stm32l562e_dk/stm32l562e_dk_common.dtsi

@@ -115,3 +115,12 @@
 		label = "SPBTLE-RF";
 	};
 };
+
+&timers2 {
+	status = "okay";
+
+	pwm2: pwm {
+		status = "okay";
+		pinctrl-0 = <&tim2_ch1_pa0>;
+	};
+};