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/lib/fdtdec.c b/lib/fdtdec.c
index 2149bd7..bdec1a0 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -38,6 +38,8 @@
 static const char * const compat_names[COMPAT_COUNT] = {
 	COMPAT(UNKNOWN, "<none>"),
 	COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"),
+	COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"),
+	COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"),
 };
 
 const char *fdtdec_get_compatible(enum fdt_compat_id id)