driver: i3c: initial i3c driver basic support for RA family

This commit introduces basic support for I3C master mode.

Signed-off-by: Ta Minh Nhat <nhat-minh.ta.yn@bp.renesas.com>

drivers/i3c/CMakeLists.txt

@@ -51,6 +51,11 @@ zephyr_library_sources_ifdef(
   i3c_stm32.c
 )
 
+zephyr_library_sources_ifdef(
+  CONFIG_I3C_RENESAS_RA
+  i3c_renesas_ra.c
+)
+
 zephyr_library_sources_ifdef(
   CONFIG_I3C_DW
   i3c_dw.c

drivers/i3c/Kconfig

@@ -214,5 +214,6 @@ rsource "Kconfig.dw"
 rsource "Kconfig.test"
 rsource "Kconfig.stm32"
 rsource "Kconfig.it51xxx"
+rsource "Kconfig.renesas"
 
 endif # I3C

drivers/i3c/Kconfig.renesas

@@ -0,0 +1,11 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+config I3C_RENESAS_RA
+	bool "Renesas RA I3C driver support"
+	default y
+	depends on DT_HAS_RENESAS_RA_I3C_ENABLED
+	select USE_RA_FSP_I3C
+	select PINCTRL
+	help
+	  Enable support for I3C on Renesas RA microcontrollers.

dts/bindings/i3c/renesas,ra-i3c.yaml

@@ -0,0 +1,56 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+description: Renesas RA I3C controller
+
+compatible: "renesas,ra-i3c"
+
+include: [i3c-controller.yaml, pinctrl-device.yaml]
+
+properties:
+  channel:
+    type: int
+    required: true
+
+  reg:
+    required: true
+
+  clocks:
+    required: true
+
+  clock-names:
+    required: true
+    enum:
+      - "pclk"
+      - "tclk"
+    description: |
+      Clocks must be given corresponding names so that the shim driver can recognize them.
+      "pclk": peripheral clock source
+      "tclk": transfer clock source
+
+  interrupts:
+    required: true
+
+  interrupt-names:
+    required: true
+    enum:
+      - "resp"
+      - "rx"
+      - "tx"
+      - "rcv"
+      - "ibi"
+      - "eei"
+    description: |
+      Interrupts must be given corresponding names so that the shim driver can recognize them.
+      "resp": Command response interrupt
+      "rx": Rx data buffer full interrupt
+      "tx": Tx data buffer empty interrupt
+      "rcv": Receive status buffer full interrupt
+      "ibi": IBI data interrupt
+      "eei": Error, timeout and HDR exit interrupt
+
+  pinctrl-0:
+    required: true
+
+  pinctrl-names:
+    required: true

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

@@ -32,6 +32,7 @@
 #define RA_PSEL_SCI_9        0x5
 #define RA_PSEL_SPI          0x6
 #define RA_PSEL_I2C          0x7
+#define RA_PSEL_I3C          0x7
 #define RA_PSEL_CLKOUT_RTC   0x9
 #define RA_PSEL_ACMPHS_VCOUT 0x9
 #define RA_PSEL_CAC_ADC      0xa

modules/Kconfig.renesas

@@ -25,6 +25,11 @@ config USE_RA_FSP_SPI
 	help
 	  Enable RA FSP SPI driver
 
+config USE_RA_FSP_I3C
+	bool
+	help
+	  Enable RA FSP I3C driver
+
 config USE_RA_FSP_DTC
 	bool
 	help