tegra: i2c: Add I2C driver

Add basic i2c driver for Tegra2 with 8- and 16-bit address support.
The driver requires CONFIG_OF_CONTROL to obtain its configuration
from the device tree.

(Simon Glass: sjg@chromium.org modified for upstream)

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Heiko Schocher <hs@denx.de>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/include/fdtdec.h b/include/fdtdec.h
index 1e198f8..171c628 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -58,6 +58,8 @@
 enum fdt_compat_id {
 	COMPAT_UNKNOWN,
 	COMPAT_NVIDIA_TEGRA20_USB,	/* Tegra2 USB port */
+	COMPAT_NVIDIA_TEGRA20_I2C,	/* Tegra2 i2c */
+	COMPAT_NVIDIA_TEGRA20_DVC,	/* Tegra2 dvc (really just i2c) */
 
 	COMPAT_COUNT,
 };