dm: i2c: Add driver for Cadence I2C IP

This is a possible drop in replacement for drivers/i2c/zynq-i2c.c

Since this is cadence IP it has been renamed to cdns-i2c,
to make sense with the compatible string.

Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index 46b83e7..9324c6c 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -58,6 +58,13 @@
 	  bindings are supported.
 	  Binding info: doc/device-tree-bindings/i2c/i2c-gpio.txt
 
+config SYS_I2C_CADENCE
+	tristate "Cadence I2C Controller"
+	depends on DM_I2C && (ARCH_ZYNQ || ARM64)
+	help
+	  Say yes here to select Cadence I2C Host Controller. This controller is
+	  e.g. used by Xilinx Zynq.
+
 config SYS_I2C_INTEL
 	bool "Intel I2C/SMBUS driver"
 	depends on DM_I2C