gecko pwm: pwm description to efr32fg1 and brd4250b

Add minimal support for efr32fg1p and the brd4250b board
as an exmaple for the driver description support

Signed-off-by: Sun Amar <sun681@gmail.com>

boards/arm/efr32_radio/efr32_radio_brd4250b.dts

@@ -12,12 +12,33 @@
 	model = "Silicon Labs BRD4250B (Flex Gecko Radio Board)";
 	compatible = "silabs,efr32_radio_brd4250b", "silabs,efr32fg1p";
 
+	pwmleds {
+		compatible = "pwm-leds";
+		status = "okay";
+		pwm_led0: pwm_led0 {
+			pwms = <&pwm0 0 PWM_POLARITY_NORMAL>;
+		};
+	};
+
+	aliases {
+		pwm-led0 = &pwm_led0;
+	};
 };
 
 &cpu0 {
 	clock-frequency = <38400000>;
 };
 
+&timer0 {
+	status = "okay";
+
+	pwm0: pwm {
+		status = "okay";
+		pin-location = <GECKO_LOCATION(28) GECKO_PORT_F GECKO_PIN(4)>;
+		prescaler = <1024>;
+	};
+};
+
 &flash0 {
 	partitions {
 		compatible = "fixed-partitions";

dts/arm/silabs/efr32fg1p.dtsi

@@ -4,6 +4,7 @@
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/i2c/i2c.h>
 #include "gpio_gecko.h"
+#include <dt-bindings/pwm/pwm.h>
 
 / {
 	chosen {
@@ -172,6 +173,21 @@
 			interrupts = <2 0>;
 			status = "disabled";
 		};
+
+		timer0: timer@40018000 {
+			compatible = "silabs,gecko-timers";
+			reg = <0x40018000 0x400>;
+			status = "disabled";
+			label = "TIMER_0";
+
+			pwm {
+				compatible = "silabs,gecko-pwm";
+				status = "disabled";
+				label = "PWM_0";
+				#pwm-cells = <2>;
+			};
+		};
+
 	};
 };
 

soc/arm/silabs_exx32/efr32fg1p/Kconfig.defconfig.efr32fg1p

@@ -22,3 +22,7 @@ config SOC_FLASH_GECKO
 config SPI_GECKO
 	default y
 	depends on SPI
+
+config PWM_GECKO
+	default y
+	depends on PWM