[PATCH v6 1/3] Documentation: devicetree: add Freescale RNGC binding

[Martin Kaiser <martin@kaiser.cx>]

From: Steffen Trumtrar <s.trumtrar@pengutronix.de>

Add binding documentation for the Freescale RNGC found on
some i.MX2/3 SoCs.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
---
Changes in v6:
  - be more precise about rngc and rngb
  - get rid of mxc, rename the file to imx-rngc.txt
  - reformat the compatible strings
  - use RNGC instead of RNG
  - clarify that clock is not optional (remove "should contain")

Changes in v5:
  none

Changes in v4:
  none

Changes in v3:
  - add compatible string for imx35
  - remove imx5 from the commit message,
    I couldn't find an i.MX SOC that has RNGC

Changes in v2:
  none

 Documentation/devicetree/bindings/rng/imx-rngc.txt | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rng/imx-rngc.txt

diff --git a/Documentation/devicetree/bindings/rng/imx-rngc.txt b/Documentation/devicetree/bindings/rng/imx-rngc.txt
new file mode 100644
index 0000000..93c7174
--- /dev/null
+++ b/Documentation/devicetree/bindings/rng/imx-rngc.txt
@@ -0,0 +1,21 @@
+Freescale RNGC (Random Number Generator Version C)
+
+The driver also supports version B, which is mostly compatible
+to version C.
+
+Required properties:
+- compatible : should be one of
+               "fsl,imx25-rngb"
+               "fsl,imx35-rngc"
+- reg : offset and length of the register set of this block
+- interrupts : the interrupt number for the RNGC block
+- clocks : the RNGC clk source
+
+Example:
+
+rng@53fb0000 {
+	compatible = "fsl,imx25-rngb";
+	reg = <0x53fb0000 0x4000>;
+	interrupts = <22>;
+	clocks = <&trng_clk>;
+};
-- 
2.1.4