driver: pinctrl: Add support for Renesas RZ/A3M

Add pinctrl support for Renesas RZ/A3M

Signed-off-by: Nhut Nguyen <[email protected]>

Author: nhutnguyenkc

boards/renesas/rza3m_ek/rza3m_ek-pinctrl.dtsi

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/gpio/gpio.h>
+#include <zephyr/dt-bindings/pinctrl/renesas/pinctrl-rza3m.h>
+
+&pinctrl {
+	/omit-if-no-ref/ scif0_pins: scif0 {
+		scif0-pinmux {
+			pinmux = <RZA_PINMUX(PORT_06, 0, 2)>, /* RXD */
+				 <RZA_PINMUX(PORT_06, 1, 2)>; /* TXD */
+			drive-strength = <1>;
+			slew-rate = "fast";
+		};
+	};
+};

include/zephyr/dt-bindings/pinctrl/renesas/pinctrl-rza3m.h

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_INCLUDE_DT_BINDINGS_PINCTRL_RENESAS_PINCTRL_RZA3M_H_
+#define ZEPHYR_INCLUDE_DT_BINDINGS_PINCTRL_RENESAS_PINCTRL_RZA3M_H_
+
+/* Superset list of all possible IO ports. */
+#define PORT_00 0x0F00 /* IO port 0 */
+#define PORT_01 0x1000 /* IO port 1 */
+#define PORT_02 0x1100 /* IO port 2 */
+#define PORT_03 0x1200 /* IO port 3 */
+#define PORT_04 0x1300 /* IO port 4 */
+#define PORT_05 0x1400 /* IO port 5 */
+#define PORT_06 0x1500 /* IO port 6 */
+#define PORT_07 0x1600 /* IO port 7 */
+#define PORT_08 0x1700 /* IO port 8 */
+#define PORT_09 0x1800 /* IO port 9 */
+#define PORT_10 0x1900 /* IO port 10 */
+#define PORT_11 0x1A00 /* IO port 11 */
+#define PORT_12 0x1B00 /* IO port 12 */
+#define PORT_20 0x0000 /* IO port 20 */
+#define PORT_21 0x0100 /* IO port 21 */
+#define PORT_22 0x0300 /* IO port 22 */
+#define PORT_23 0x0400 /* IO port 23 */
+
+/*
+ * Create the value contain port/pin/function information
+ *
+ * port: port number BSP_IO_PORT_00..BSP_IO_PORT_18
+ * pin: pin number
+ * func: pin function
+ */
+#define RZA_PINMUX(port, pin, func) (port | pin | (func << 4))
+
+/* Special purpose port */
+#define BSP_IO_NMI 0xFFFF0001 /* NMI */
+
+#define BSP_IO_TMS_SWDIO 0xFFFF0200 /* TMS_SWDIO */
+
+#define BSP_IO_SD0_CLK 0xFFFF0400 /* SD0_CLK */
+
+#define BSP_IO_QSPI0_SPCLK 0xFFFF0500 /* QSPI0_SPCLK */
+#define BSP_IO_QSPI0_IO0   0xFFFF0501 /* QSPI0_IO0 */
+#define BSP_IO_QSPI0_IO1   0xFFFF0502 /* QSPI0_IO1 */
+#define BSP_IO_QSPI0_SSL   0xFFFF0505 /* QSPI0_SSL */
+
+#define BSP_IO_WDTOVF_PERROUT 0xFFFF0600 /* WDTOVF_PERROUT */
+
+#define BSP_IO_RIIC0_SDA 0xFFFF0700 /* RIIC0_SDA */
+#define BSP_IO_RIIC0_SCL 0xFFFF0701 /* RIIC0_SCL */
+
+/* FILNUM */
+#define RZA_FILNUM_4_STAGE  0
+#define RZA_FILNUM_8_STAGE  1
+#define RZA_FILNUM_12_STAGE 2
+#define RZA_FILNUM_16_STAGE 3
+
+/* FILCLKSEL */
+#define RZA_FILCLKSEL_NOT_DIV   0
+#define RZA_FILCLKSEL_DIV_9000  1
+#define RZA_FILCLKSEL_DIV_18000 2
+#define RZA_FILCLKSEL_DIV_36000 3
+
+#define RZA_FILTER_SET(filnum, filclksel) (((filnum) & 0x3) << 0x2) | (filclksel & 0x3)
+
+#endif /* ZEPHYR_INCLUDE_DT_BINDINGS_PINCTRL_RENESAS_PINCTRL_RZA3M_H_ */

soc/renesas/rz/common/pinctrl_rza.h

@@ -62,6 +62,14 @@ typedef struct pinctrl_soc_pin_t {
 
 #define RZA_FILTER_ON_OFF(node_id) COND_CODE_0(DT_PROP(node_id, renesas_filter), (0), (1))
 
+#if defined(CONFIG_SOC_SERIES_RZA3M)
+#define RZA_GET_PFC(node_id, state_prop, idx)                                                      \
+	(RZA_GET_FUNC(DT_PROP_BY_IDX(node_id, state_prop, idx)) - 1)
+#else
+#define RZA_GET_PFC(node_id, state_prop, idx)                                                      \
+	(RZA_GET_FUNC(DT_PROP_BY_IDX(node_id, state_prop, idx)))
+#endif
+
 /* Process pinmux cfg */
 #define Z_PINCTRL_PINMUX_INIT(node_id, state_prop, idx)                                            \
 	{                                                                                          \
@@ -77,7 +85,7 @@ typedef struct pinctrl_soc_pin_t {
 				.filonoff_reg = RZA_FILTER_ON_OFF(node_id),                        \
 				.filnum_reg = RZA_GET_FILNUM(node_id),                             \
 				.filclksel_reg = RZA_GET_FILCLKSEL(node_id),                       \
-				.pfc_reg = RZA_GET_FUNC(DT_PROP_BY_IDX(node_id, state_prop, idx)), \
+				.pfc_reg = RZA_GET_PFC(node_id, state_prop, idx),                  \
 			},                                                                         \
 	},