drivers: i2c: introduce GD32 I2C driver

Add an interrupt driven i2c driver for gd32 i2c peripheral.

The transmit and reception method refer from GD32 SoCs user manual.
Particularly, reception method choose the solution B.

There have some wait for state ready logic in the driver. It cause by
i2c device internal state change slower than i2c driver.

Signed-off-by: HaiLong Yang <[email protected]>

Author: cameled

drivers/i2c/CMakeLists.txt

@@ -36,6 +36,7 @@ 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_TCA954X		i2c_tca954x.c)
 zephyr_library_sources_ifdef(CONFIG_I2C_XEC_V2		i2c_mchp_xec_v2.c)
+zephyr_library_sources_ifdef(CONFIG_I2C_GD32		i2c_gd32.c)
 
 zephyr_library_sources_ifdef(CONFIG_I2C_STM32_V1
 	i2c_ll_stm32_v1.c

drivers/i2c/Kconfig

@@ -50,6 +50,7 @@ source "drivers/i2c/Kconfig.npcx"
 source "drivers/i2c/Kconfig.test"
 source "drivers/i2c/Kconfig.rcar"
 source "drivers/i2c/Kconfig.tca954x"
+source "drivers/i2c/Kconfig.gd32"
 
 config I2C_INIT_PRIORITY
 	int "Init priority"

drivers/i2c/Kconfig.gd32

@@ -0,0 +1,11 @@
+# Copyright (c) 2021 BrainCo Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+DT_COMPAT_GD32_I2C := gd,gd32-i2c
+
+config I2C_GD32
+	bool "GigaDevice GD32 I2C driver"
+	depends on (SOC_FAMILY_GD32 || SOC_SERIES_GD32VF103)
+	default $(dt_compat_enabled,$(DT_COMPAT_GD32_I2C))
+	help
+	  Enables GigaDevice GD32 I2C driver