MXS: Implement DMA support into mxs-i2c

This patch implements DMA support into mxs-i2c. DMA transfers are now enabled
via DT. The DMA operation is enabled by default.

Signed-off-by: Marek Vasut <marex@denx.de>
Tested-by: Fabio Estevam <fabio.estevam@freescale.com>

[wsa: rebased to 3.6-rc7]

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/i2c/i2c-mxs.txt b/Documentation/devicetree/bindings/i2c/i2c-mxs.txt
index 30ac3a0557f7..7a3fe9e5f4cb 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-mxs.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-mxs.txt
@@ -6,6 +6,7 @@ Required properties:
 - interrupts: Should contain ERROR and DMA interrupts
 - clock-frequency: Desired I2C bus clock frequency in Hz.
                    Only 100000Hz and 400000Hz modes are supported.
+- fsl,i2c-dma-channel: APBX DMA channel for the I2C
 
 Examples:
 
@@ -16,4 +17,5 @@ i2c0: i2c@80058000 {
         reg = <0x80058000 2000>;
         interrupts = <111 68>;
         clock-frequency = <100000>;
+        fsl,i2c-dma-channel = <6>;
 };