i2c: Describe Cadence I2C devicetree bindings

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/doc/device-tree-bindings/i2c/i2c-cdns.txt b/doc/device-tree-bindings/i2c/i2c-cdns.txt
new file mode 100644 (file)
index 0000000..202e0b7
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+++ b/doc/device-tree-bindings/i2c/i2c-cdns.txt
@@ -0,0 +1,20 @@
+Cadence I2C controller Device Tree Bindings
+-------------------------------------------
+
+Required properties:
+- compatible           : Should be "cdns,i2c-r1p10" or "xlnx,zynq-spi-r1p10".
+- reg                  : Physical base address and size of I2C registers map.
+- interrupts           : Property with a value describing the interrupt
+                         number.
+- interrupt-parent     : Must be core interrupt controller
+- clocks               : Clock phandles (see clock bindings for details).
+
+Example:
+       i2c0: i2c@e0004000 {
+               compatible = "cdns,i2c-r1p10";
+               reg = <0xe0004000 0x1000>;
+               clocks = <&clkc 38>;
+               interrupts = <0 25 4>;
+               interrupt-parent = <&intc>;
+               status = "disabled";
+       };