drivers: i2c: rts5912 i2c dirver

base on DesignWare I2C driver to implement RTS5912 I2C driver.

1. support customize bus recovery function.
2. fix isr timing issue by enable tx empty control.
3. support stuck at low handle by enable bus clear feature.
4. support custom stuck at low timeout set from dts
5. disable block mode in rts5912 i2c.
6. support I2C_ALLOW_NO_STOP_TRANSACTIONS

Signed-off-by: Titan Chen <[email protected]>

Author: Titan-Realtek

drivers/i2c/CMakeLists.txt

@@ -57,6 +57,7 @@ zephyr_library_sources_ifdef(CONFIG_I2C_RCAR		i2c_rcar.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_RENESAS_RA_IIC	i2c_renesas_ra_iic.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_RENESAS_RA_SCI_B	i2c_renesas_ra_sci_b.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_RENESAS_RZ_RIIC i2c_renesas_rz_riic.c)
+zephyr_library_sources_ifdef(CONFIG_I2C_RTS5912		i2c_realtek_rts5912.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_RV32M1_LPI2C	i2c_rv32m1_lpi2c.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_SAM0		i2c_sam0.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_SAM_TWI		i2c_sam_twi.c)

drivers/i2c/Kconfig

@@ -61,7 +61,7 @@ config I2C_ALLOW_NO_STOP_TRANSACTIONS
 	depends on !I2C_STM32
 	depends on !I2C_GD32
 	depends on !I2C_ESP32
-	depends on !I2C_DW
+	depends on (!I2C_DW || I2C_RTS5912)
 	select DEPRECATED
 	help
 	  Allow I2C transactions with no STOP on the last message. This is
@@ -146,6 +146,7 @@ source "drivers/i2c/Kconfig.omap"
 source "drivers/i2c/Kconfig.rcar"
 source "drivers/i2c/Kconfig.renesas_ra"
 source "drivers/i2c/Kconfig.renesas_rz"
+source "drivers/i2c/Kconfig.rts5912"
 source "drivers/i2c/Kconfig.sam0"
 source "drivers/i2c/Kconfig.sam_twihs"
 source "drivers/i2c/Kconfig.sbcon"

drivers/i2c/Kconfig.dw

@@ -12,11 +12,12 @@ menuconfig I2C_DW
 config I2C_DW_CLOCK_SPEED
 	int "Set the clock speed for I2C"
 	depends on I2C_DW
+	default 110 if I2C_RTS5912
 	default 32
 
 config I2C_DW_LPSS_DMA
 	bool "Use I2C integrated DMA for asynchronous transfer"
-	depends on I2C_DW
+	depends on (I2C_DW && !I2C_RTS5912)
 	select DMA
 	select DMA_INTEL_LPSS
 	help

drivers/i2c/Kconfig.rts5912

@@ -0,0 +1,24 @@
+# Copyright (c) 2025 Realtek, SIBG-SD7
+# SPDX-License-Identifier: Apache-2.0
+
+config I2C_DW_EXTENDED_SUPPORT
+	bool "Extended DW features"
+	help
+	  This option enables support for the SCL/SDA timeout registers and some
+	  additional features of the DW I2C controller.
+
+menuconfig I2C_RTS5912
+	bool "Realtek RTS5912 I2C support"
+	default y
+	depends on DT_HAS_REALTEK_RTS5912_I2C_ENABLED
+	select I2C_ALLOW_NO_STOP_TRANSACTIONS
+	select I2C_DW_EXTENDED_SUPPORT
+	help
+	  Enable the Realtek RTS5912 I2C driver
+
+config I2C_RTS5912_INIT_PRIORITY
+	int "RTS5912 Init priority"
+	depends on I2C_RTS5912
+	default 51
+	help
+	  I2C device driver initialization priority.