Document the binding used by the MediaTek ARMv8 SoCs random
number generator with TrustZone enabled.

Signed-off-by: Neal Liu <neal....@mediatek.com>
---
 Documentation/devicetree/bindings/rng/mtk-rng.txt |   13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/rng/mtk-rng.txt 
b/Documentation/devicetree/bindings/rng/mtk-rng.txt
index 2bc89f1..1fb9b1d 100644
--- a/Documentation/devicetree/bindings/rng/mtk-rng.txt
+++ b/Documentation/devicetree/bindings/rng/mtk-rng.txt
@@ -3,9 +3,12 @@ found in MediaTek SoC family
 
 Required properties:
 - compatible       : Should be
-                       "mediatek,mt7622-rng",  "mediatek,mt7623-rng" : for 
MT7622
-                       "mediatek,mt7629-rng",  "mediatek,mt7623-rng" : for 
MT7629
-                       "mediatek,mt7623-rng" : for MT7623
+                       "mediatek,mt7622-rng", "mediatek,mt7623-rng" for MT7622
+                       "mediatek,mt7629-rng", "mediatek,mt7623-rng" for MT7629
+                       "mediatek,mt7623-rng" for MT7623
+                       "mediatek,mtk-sec-rng" for MediaTek ARMv8 SoCs
+
+Optional properties:
 - clocks           : list of clock specifiers, corresponding to
                      entries in clock-names property;
 - clock-names      : Should contain "rng" entries;
@@ -19,3 +22,7 @@ rng: rng@1020f000 {
        clocks = <&infracfg CLK_INFRA_TRNG>;
        clock-names = "rng";
 };
+
+hwrng: hwrng {
+       compatible = "mediatek,mtk-sec-rng";
+};
-- 
1.7.9.5

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