drivers: pwm: Initial support for PWM driver on RA8

Add PWM driver code support for RA8. This support is using
GPT HW

Signed-off-by: Duy Phuong Hoang. Nguyen <[email protected]>

Author: duynguyenxa

boards/renesas/ek_ra8m1/doc/index.rst

@@ -106,6 +106,8 @@ The below features are currently supported on Zephyr OS for EK-RA8M1 board:
 +-----------+------------+----------------------+
 | FLASH     | on-chip    | flash                |
 +-----------+------------+----------------------+
+| PWM       | on-chip    | pwm                  |
++-----------+------------+----------------------+
 
 Other hardware features are currently not supported by the port.
 

boards/renesas/ek_ra8m1/ek_ra8m1-pinctrl.dtsi

@@ -53,4 +53,15 @@
 			<RA_PSEL(RA_PSEL_SPI, 4, 13)>;
 		};
 	};
+
+	pwm7_default: pwm7_default {
+		group1 {
+			/* GTIOC7A */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 6, 3)>;
+		};
+		group2 {
+			/* GTIOC7B */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 6, 2)>;
+		};
+	};
 };

boards/renesas/ek_ra8m1/ek_ra8m1.dts

@@ -167,6 +167,12 @@ mikrobus_serial: &uart3 {};
 
 &spi1 {
 	pinctrl-0 = <&spi1_default>;
+};
+
+&pwm7 {
+	pinctrl-0 = <&pwm7_default>;
+	interrupts = <40 1>, <41 1>;
+	interrupt-names = "gtioca", "overflow";
 	pinctrl-names = "default";
 	status = "okay";
 };

drivers/pwm/CMakeLists.txt

@@ -44,6 +44,7 @@ zephyr_library_sources_ifdef(CONFIG_PWM_NUMAKER		pwm_numaker.c)
 zephyr_library_sources_ifdef(CONFIG_PWM_NXP_FLEXIO	pwm_nxp_flexio.c)
 zephyr_library_sources_ifdef(CONFIG_PWM_NXP_S32_EMIOS pwm_nxp_s32_emios.c)
 zephyr_library_sources_ifdef(CONFIG_PWM_ENE_KB1200	pwm_ene_kb1200.c)
+zephyr_library_sources_ifdef(CONFIG_PWM_RENESAS_RA8	pwm_renesas_ra8.c)
 
 zephyr_library_sources_ifdef(CONFIG_USERSPACE   pwm_handlers.c)
 zephyr_library_sources_ifdef(CONFIG_PWM_CAPTURE pwm_capture.c)

drivers/pwm/Kconfig

@@ -108,4 +108,6 @@ source "drivers/pwm/Kconfig.nxp_flexio"
 
 source "drivers/pwm/Kconfig.ene"
 
+source "drivers/pwm/Kconfig.renesas_ra8"
+
 endif # PWM

drivers/pwm/Kconfig.renesas_ra8

@@ -0,0 +1,10 @@
+# Copyright (c) 2024 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+config PWM_RENESAS_RA8
+	bool "Renesas RA8 PWM driver"
+	default y
+	depends on DT_HAS_RENESAS_RA8_PWM_ENABLED
+	select USE_RA_FSP_GPT
+	help
+	  Enable Renesas RA8 PWM Driver.