driver: pwm: create ambiq pwm driver

Restructured counter and timer.
CTimer/Timer is now parent to pwm and counter.
Created PWM driver and tied to pwm and pwm-led

Signed-off-by: Richard Wheatley <richard.wheatley@ambiq.com>

Author: RichardSWheatley

boards/ambiq/apollo3_evb/apollo3_evb-pinctrl.dtsi

@@ -140,4 +140,10 @@
 				 <BLEIF_IRQ_P41>;
 		};
 	};
+
+	pwm2_default: pwm2_default{
+		group1 {
+			pinmux = <GPIO_P30>;
+		};
+	};
 };

boards/ambiq/apollo3_evb/apollo3_evb.dts

@@ -30,6 +30,7 @@
 		sw1 = &button1;
 		bootloader-led0 = &led0;
 		mcuboot-led0 = &led0;
+		pwm-led0 = &pwm_led0;
 	};
 
 	leds {
@@ -74,6 +75,15 @@
 			zephyr,code = <INPUT_KEY_2>;
 		};
 	};
+
+	pwmleds: pwmleds {
+		compatible = "pwm-leds";
+		status = "disabled";
+		pwm_led0: pwm_led_0 {
+			pwms = <&pwm2 0 PWM_MSEC(20) PWM_POLARITY_NORMAL>;
+			label = "PWM_LED";
+		};
+	};
 };
 
 &flash0 {
@@ -159,8 +169,21 @@
 	};
 };
 
-&counter0 {
-	status = "disabled";
+&timer0 {
+	counter0: counter {
+		status = "disabled";
+	};
+};
+
+&timer2 {
+	pwm2: pwm {
+		timer-segment = "SEGMENT_B";
+		clock-select = "CLK_SELECT_HFRC_187_5KHZ";
+		pwm-type = "PWM_REPEAT";
+		pinctrl-0 = <&pwm2_default>;
+		pinctrl-names = "default";
+		status = "disabled";
+	};
 };
 
 &rtc0 {

boards/ambiq/apollo3p_evb/apollo3p_evb-pinctrl.dtsi

@@ -179,4 +179,10 @@
 				 <BLEIF_IRQ_P41>;
 		};
 	};
+
+	pwm2_default: pwm2_default{
+		group1 {
+			pinmux = <GPIO_P30>;
+		};
+	};
 };

boards/ambiq/apollo3p_evb/apollo3p_evb.dts

@@ -26,6 +26,7 @@
 		led2 = &led2;
 		sw0 = &button0;
 		sw1 = &button1;
+		pwm-led0 = &pwm_led0;
 	};
 
 	leds {
@@ -70,6 +71,15 @@
 			zephyr,code = <INPUT_KEY_2>;
 		};
 	};
+
+	pwmleds: pwmleds {
+		compatible = "pwm-leds";
+		status = "disabled";
+		pwm_led0: pwm_led_0 {
+			pwms = <&pwm2 0 PWM_MSEC(20) PWM_POLARITY_NORMAL>;
+			label = "PWM_LED";
+		};
+	};
 };
 
 &flash0 {
@@ -137,8 +147,21 @@
 	};
 };
 
-&counter0 {
-	status = "disabled";
+&timer0 {
+	counter0: counter {
+		status = "disabled";
+	};
+};
+
+&timer2 {
+	pwm2: pwm {
+		timer-segment = "SEGMENT_B";
+		clock-select = "CLK_SELECT_HFRC_187_5KHZ";
+		pwm-type = "PWM_REPEAT";
+		pinctrl-0 = <&pwm2_default>;
+		pinctrl-names = "default";
+		status = "disabled";
+	};
 };
 
 &rtc0 {

boards/ambiq/apollo4p_blue_kxr_evb/apollo4p_blue_kxr_evb-pinctrl.dtsi

@@ -170,4 +170,11 @@
 			drive-strength = "0.1";
 		};
 	};
+	pwm2_default: pwm2_default{
+		group1 {
+			pinmux = <CT30_P30>;
+			drive-open-drain;
+			drive-strength = "0.5";
+		};
+	};
 };

boards/ambiq/apollo4p_blue_kxr_evb/apollo4p_blue_kxr_evb.dts

@@ -26,6 +26,7 @@
 		led2 = &led2;
 		sw0 = &button0;
 		sw1 = &button1;
+		pwm-led0 = &pwm_led0;
 	};
 
 	leds {
@@ -60,6 +61,15 @@
 			status = "okay";
 		};
 	};
+
+	pwmleds: pwmleds {
+		compatible = "pwm-leds";
+		status = "disabled";
+		pwm_led0: pwm_led_0 {
+			pwms = <&pwm2 0 PWM_MSEC(20) PWM_POLARITY_NORMAL>;
+			label = "PWM_LED";
+		};
+	};
 };
 
 &uart0 {
@@ -75,8 +85,19 @@
 	status = "okay";
 };
 
-&counter0 {
-	status = "disabled";
+&timer0 {
+	counter0: counter {
+		status = "disabled";
+	};
+};
+
+&timer2 {
+	pwm2: pwm {
+		clock-select = "CLK_SELECT_HFRC_DIV64";
+		pinctrl-0 = <&pwm2_default>;
+		pinctrl-names = "default";
+		status = "disabled";
+	};
 };
 
 &rtc0 {

boards/ambiq/apollo4p_evb/apollo4p_evb-pinctrl.dtsi

@@ -192,4 +192,11 @@
 				 ambiq,pull-up-ohms = <12000>;
 		};
 	};
+	pwm2_default: pwm2_default{
+		group1 {
+			pinmux = <CT30_P30>;
+			drive-open-drain;
+			drive-strength = "0.5";
+		};
+	};
 };

boards/ambiq/apollo4p_evb/apollo4p_evb.dts

@@ -25,6 +25,7 @@
 		led2 = &led2;
 		sw0 = &button0;
 		sw1 = &button1;
+		pwm-led0 = &pwm_led0;
 	};
 
 	leds {
@@ -59,6 +60,14 @@
 			status = "okay";
 		};
 	};
+	pwmleds: pwmleds {
+		compatible = "pwm-leds";
+		status = "disabled";
+		pwm_led0: pwm_led_0 {
+			pwms = <&pwm2 0 PWM_MSEC(20) PWM_POLARITY_NORMAL>;
+			label = "PWM_LED";
+		};
+	};
 };
 
 &uart0 {
@@ -80,8 +89,19 @@
 	status = "disabled";
 };
 
-&counter0 {
-	status = "disabled";
+&timer0 {
+	counter0: counter {
+		status = "disabled";
+	};
+};
+
+&timer2 {
+	pwm2: pwm {
+		clock-select = "CLK_SELECT_HFRC_DIV64";
+		pinctrl-0 = <&pwm2_default>;
+		pinctrl-names = "default";
+		status = "disabled";
+	};
 };
 
 &rtc0 {