dt-bindings: hwrng: Add Mediatek hardware random generator bindings

Document the devicetree bindings for Mediatek random number
generator which could be found on MT7623 SoC or other similar
Mediatek SoCs.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/Documentation/devicetree/bindings/rng/mtk-rng.txt b/Documentation/devicetree/bindings/rng/mtk-rng.txt
new file mode 100644 (file)
index 0000000..a6d62a2
--- /dev/null
+++ b/Documentation/devicetree/bindings/rng/mtk-rng.txt
@@ -0,0 +1,18 @@
+Device-Tree bindings for Mediatek random number generator
+found in Mediatek SoC family
+
+Required properties:
+- compatible       : Should be "mediatek,mt7623-rng"
+- clocks           : list of clock specifiers, corresponding to
+                     entries in clock-names property;
+- clock-names      : Should contain "rng" entries;
+- reg              : Specifies base physical address and size of the registers
+
+Example:
+
+rng: rng@1020f000 {
+       compatible = "mediatek,mt7623-rng";
+       reg = <0 0x1020f000 0 0x1000>;
+       clocks = <&infracfg CLK_INFRA_TRNG>;
+       clock-names = "rng";
+};