boards: renesas: Add configurations to support pwm on EK-RA8D1

Add support for PWM driver on EK-RA8D1

Signed-off-by: Quy Tran <[email protected]>

boards/renesas/ek_ra8d1/doc/index.rst

@@ -104,6 +104,8 @@ The below features are currently supported on Zephyr OS for EK-RA8D1 board:
 +--------------+------------+------------------+
 | FLASH        | on-chip    | flash            |
 +--------------+------------+------------------+
+| PWM          | on-chip    | pwm              |
++--------------+------------+------------------+
 
 Other hardware features are currently not supported by the port.
 

boards/renesas/ek_ra8d1/ek_ra8d1-pinctrl.dtsi

@@ -25,4 +25,15 @@
 			<RA_PSEL(RA_PSEL_SPI, 7, 3)>;
 		};
 	};
+
+	pwm7_default: pwm7_default {
+		group1 {
+			/* GTIOC7A */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 10, 7)>;
+		};
+		group2 {
+			/* GTIOC7B */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 10, 6)>;
+		};
+	};
 };

boards/renesas/ek_ra8d1/ek_ra8d1.dts

@@ -124,3 +124,11 @@
 		};
 	};
 };
+
+&pwm7 {
+	pinctrl-0 = <&pwm7_default>;
+	interrupts = <40 1>, <41 1>;
+	interrupt-names = "gtioca", "overflow";
+	pinctrl-names = "default";
+	status = "okay";
+};

tests/drivers/pwm/pwm_loopback/boards/ek_ra8d1.overlay

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2024 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pwm/pwm.h>
+#include <zephyr/dt-bindings/pwm/ra_pwm.h>
+
+/ {
+	pwm_loopback_0 {
+		compatible = "test-pwm-loopback";
+		/* first index must be a 32-Bit timer */
+		pwms = <&pwm7 0 0 PWM_POLARITY_NORMAL>,
+			<&pwm9 0 0 PWM_POLARITY_NORMAL>;
+	};
+};
+
+&pinctrl {
+	pwm9_default: pwm9_default {
+		group1 {
+			/* GTIOC9A */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 4, 11)>;
+		};
+		group2 {
+			/* GTIOC9B */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 4, 10)>;
+		};
+	};
+};
+
+&pwm9 {
+	pinctrl-0 = <&pwm9_default>;
+	pinctrl-names = "default";
+	interrupts = <50 1>, <51 1>;
+	interrupt-names = "gtioca", "overflow";
+	status = "okay";
+};