boards: arm: ucans32k1sic: enable FlexTimer/PWM support

Enable FlexTimer (FTM) as a PWM controller for this board. Use the RGB
LED controlled by FTM0 as PWM-LEDs for the samples and tests.

Signed-off-by: Manuel Argüelles <[email protected]>

Author: manuargue

boards/arm/ucans32k1sic/doc/index.rst

@@ -49,6 +49,7 @@ GPIO          on-chip     gpio
 LPUART        on-chip     serial
 LPI2C         on-chip     i2c
 LPSPI         on-chip     spi
+FTM           on-chip     pwm
 ============  ==========  ================================
 
 The default configuration can be found in the Kconfig file
@@ -67,15 +68,30 @@ children nodes with the desired pinmux configuration to the singleton node
 LEDs
 ----
 
-The UCANS32K1SIC board has one user RGB LED:
-
-=======================  ==============  =====
-Devicetree node          Label           Pin
-=======================  ==============  =====
-led0 / led1_red          LED1_RGB_RED    PTD15
-led1 / led1_green        LED1_RGB_GREEN  PTD16
-led2 / led1_blue         LED1_RGB_BLUE   PTD0
-=======================  ==============  =====
+The UCANS32K1SIC board has one user RGB LED that can be used either as a GPIO
+LED or as a PWM LED.
+
+.. table:: RGB LED as GPIO LED
+   :widths: auto
+
+   ===============  ================  ===============  =====
+   Devicetree node  Devicetree alias  Label            Pin
+   ===============  ================  ===============  =====
+   led1_red         led0              LED1_RGB_RED     PTD15
+   led1_green       led1              LED1_RGB_GREEN   PTD16
+   led1_blue        led2              LED1_RGB_BLUE    PTD0
+   ===============  ================  ===============  =====
+
+.. table:: RGB LED as PWM LED
+   :widths: auto
+
+   ===============  ========================  ==================  ================
+   Devicetree node  Devicetree alias          Label               Pin
+   ===============  ========================  ==================  ================
+   led1_red_pwm     pwm-led0 / red-pwm-led    LED1_RGB_RED_PWM    PTD15 / FTM0_CH0
+   led1_green_pwm   pwm-led1 / green-pwm-led  LED1_RGB_GREEN_PWM  PTD16 / FTM0_CH1
+   led1_blue_pwm    pwm-led2 / blue-pwm-led   LED1_RGB_BLUE_PWM   PTD0 / FTM0_CH2
+   ===============  ========================  ==================  ================
 
 The user can control the LEDs in any way. An output of ``0`` illuminates the LED.
 

boards/arm/ucans32k1sic/ucans32k1sic-pinctrl.dtsi

@@ -37,4 +37,27 @@
 			drive-strength = "low";
 		};
 	};
+
+	ftm0_default: ftm0_default {
+		group0 {
+			pinmux = <FTM0_CH0_PTD15>,
+				<FTM0_CH1_PTD16>,
+				<FTM0_CH2_PTD0>;
+			drive-strength = "low";
+		};
+	};
+
+	ftm1_default: ftm1_default {
+		group0 {
+			pinmux = <FTM1_CH1_PTA1>;
+			drive-strength = "low";
+		};
+	};
+
+	ftm2_default: ftm2_default {
+		group0 {
+			pinmux = <FTM2_CH1_PTA0>;
+			drive-strength = "low";
+		};
+	};
 };

boards/arm/ucans32k1sic/ucans32k1sic.dts

@@ -7,6 +7,7 @@
 /dts-v1/;
 #include <zephyr/dt-bindings/gpio/gpio.h>
 #include <zephyr/dt-bindings/input/input-event-codes.h>
+#include <zephyr/dt-bindings/pwm/pwm.h>
 #include <arm/nxp/nxp_s32k146.dtsi>
 #include "ucans32k1sic-pinctrl.dtsi"
 
@@ -26,6 +27,13 @@
 		led0 = &led1_red;
 		led1 = &led1_green;
 		led2 = &led1_blue;
+		pwm-led0 = &led1_red_pwm;
+		pwm-led1 = &led1_green_pwm;
+		pwm-led2 = &led1_blue_pwm;
+		red-pwm-led = &led1_red_pwm;
+		green-pwm-led = &led1_green_pwm;
+		blue-pwm-led = &led1_blue_pwm;
+		pwm-0 = &ftm0;
 		sw0 = &button_3;
 		i2c-0 = &lpi2c0;
 	};
@@ -47,6 +55,23 @@
 		};
 	};
 
+	pwmleds {
+		compatible = "pwm-leds";
+
+		led1_red_pwm: led_pwm_0 {
+			pwms = <&ftm0 0 PWM_MSEC(20) PWM_POLARITY_INVERTED>;
+			label = "LED1_RGB_RED_PWM";
+		};
+		led1_green_pwm: led_pwm_1 {
+			pwms = <&ftm0 1 PWM_MSEC(20) PWM_POLARITY_INVERTED>;
+			label = "LED1_RGB_GREEN_PWM";
+		};
+		led1_blue_pwm: led_pwm_2 {
+			pwms = <&ftm0 2 PWM_MSEC(20) PWM_POLARITY_INVERTED>;
+			label = "LED1_RGB_BLUE_PWM";
+		};
+	};
+
 	gpio_keys {
 		compatible = "gpio-keys";
 
@@ -104,3 +129,28 @@
 	pinctrl-names = "default";
 	status = "okay";
 };
+
+&ftm0 {
+	compatible = "nxp,kinetis-ftm-pwm";
+	pinctrl-0 = <&ftm0_default>;
+	pinctrl-names = "default";
+	prescaler = <128>;
+	#pwm-cells = <3>;
+	status = "okay";
+};
+
+&ftm1 {
+	compatible = "nxp,kinetis-ftm-pwm";
+	pinctrl-0 = <&ftm1_default>;
+	pinctrl-names = "default";
+	#pwm-cells = <3>;
+	status = "okay";
+};
+
+&ftm2 {
+	compatible = "nxp,kinetis-ftm-pwm";
+	pinctrl-0 = <&ftm2_default>;
+	pinctrl-names = "default";
+	#pwm-cells = <3>;
+	status = "okay";
+};

boards/arm/ucans32k1sic/ucans32k1sic.yaml

@@ -17,3 +17,4 @@ supported:
   - pinctrl
   - i2c
   - spi
+  - pwm