drivers: i2c: add Renesas R-Car driver

This patch add support for I2C on the Renesas R-Car.

This I2C hardware block can be found on various Renesas R-Car
SoC series.

It allows to perfom read and write on I2C buses in an
interrupt based way on R-Car Gen3 H3ULCB board.

Signed-off-by: Aymeric Aillet <[email protected]>

Author: aaillet

CODEOWNERS

@@ -235,6 +235,7 @@
 /drivers/i2c/slave/*eeprom*               @henrikbrixandersen
 /drivers/i2c/Kconfig.test                 @mbolivar-nordic
 /drivers/i2c/i2c_test.c                   @mbolivar-nordic
+/drivers/i2c/*rcar*                       @aaillet
 /drivers/i2s/*litex*                      @mateusz-holenko @kgugala @pgielda
 /drivers/ieee802154/                      @rlubos @tbursztyka
 /drivers/ieee802154/ieee802154_rf2xx*     @tbursztyka @nandojve

drivers/i2c/CMakeLists.txt

@@ -32,6 +32,7 @@ zephyr_library_sources_ifdef(CONFIG_I2C_LITEX		i2c_litex.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_NPCX		i2c_npcx_controller.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_NPCX		i2c_npcx_port.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_DW		i2c_dw.c)
+zephyr_library_sources_ifdef(CONFIG_I2C_RCAR		i2c_rcar.c)
 
 zephyr_library_sources_ifdef(CONFIG_I2C_STM32_V1
 	i2c_ll_stm32_v1.c

drivers/i2c/Kconfig

@@ -41,6 +41,7 @@ source "drivers/i2c/Kconfig.litex"
 source "drivers/i2c/Kconfig.lpc11u6x"
 source "drivers/i2c/Kconfig.npcx"
 source "drivers/i2c/Kconfig.test"
+source "drivers/i2c/Kconfig.rcar"
 
 config I2C_INIT_PRIORITY
 	int "Init priority"

drivers/i2c/Kconfig.rcar

@@ -0,0 +1,10 @@
+# Reneas R-Car Gen3 I2C configuration options
+
+# Copyright (c) 2021 IoT.bzh
+# SPDX-License-Identifier: Apache-2.0
+
+config I2C_RCAR
+	bool "Renesas R-Car I2C Driver"
+	depends on SOC_FAMILY_RCAR
+	help
+	  Enable Renesas R-Car I2C Driver.