dm: Move CONFIG_I2C_COMPAT to Kconfig

Make this option available in Kconfig and clean up the board that uses it.
Note there is also an entry in exynos5-common.h but this affects multiple
boards and should be dropped as part of the Samsung I2C migration to
driver model.

Signed-off-by: Simon Glass <sjg@chromium.org>

configs/odroid_defconfig

@@ -3,3 +3,5 @@ CONFIG_ARCH_EXYNOS=y
 CONFIG_TARGET_ODROID=y
 CONFIG_OF_CONTROL=y
 CONFIG_DEFAULT_DEVICE_TREE="exynos4412-odroid"
+CONFIG_DM_I2C=y
+CONFIG_DM_I2C_COMPAT=y

drivers/i2c/Kconfig

@@ -13,6 +13,15 @@ config DM_I2C
 	  enabled together (it is not possible to use driver model
 	  for one and not the other).
 
+config DM_I2C_COMPAT
+	bool "Enable I2C compatibility layer"
+	depends on DM
+	help
+	  Enable old-style I2C functions for compatibility with existing code.
+	  This option can be enabled as a temporary measure to avoid needing
+	  to convert all code for a board in a single commit. It should not
+	  be enabled for any board in an official release.
+
 config SYS_I2C_UNIPHIER
 	bool "UniPhier I2C driver"
 	depends on ARCH_UNIPHIER && DM_I2C

include/configs/exynos5-common.h

@@ -126,6 +126,8 @@
 #define SPI_FLASH_UBOOT_POS	(CONFIG_SEC_FW_SIZE + CONFIG_BL1_SIZE)
 
 /* I2C */
+
+/* TODO(sjg@chromium.org): Move these two options to Kconfig */
 #define CONFIG_DM_I2C
 #define CONFIG_DM_I2C_COMPAT
 #define CONFIG_CMD_I2C

include/configs/odroid.h

@@ -177,8 +177,6 @@
 
 /* I2C */
 #define CONFIG_CMD_I2C
-#define CONFIG_DM_I2C
-#define CONFIG_DM_I2C_COMPAT
 #define CONFIG_SYS_I2C_S3C24X0
 #define CONFIG_SYS_I2C_S3C24X0_SPEED	100000
 #define CONFIG_SYS_I2C_S3C24X0_SLAVE	0