Add DT bindings documentation for the rk3288 crypto drivers.

Signed-off-by: Zain Wang <zain.w...@rock-chips.com>
---
 .../devicetree/bindings/crypto/rk-crypto.txt       | 31 ++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/crypto/rk-crypto.txt

diff --git a/Documentation/devicetree/bindings/crypto/rk-crypto.txt 
b/Documentation/devicetree/bindings/crypto/rk-crypto.txt
new file mode 100644
index 0000000..1e50768
--- /dev/null
+++ b/Documentation/devicetree/bindings/crypto/rk-crypto.txt
@@ -0,0 +1,31 @@
+Rockchip Electronics And Security Accelerator
+
+Required properties:
+- compatible: should be "rockchip,crypto"
+- reg: base physical address of the engine and length of memory mapped
+       region.
+- interrupts: interrupt number
+- clocks: clock specifiers
+- clock-names: "aclk_crypto" used to clock data
+                          "hclk_crypto" used to clock data
+                          "srst_crypto" used to clock crypto accelerator
+                          "apb_pclk"    used to clock dma
+-status: Enable
+
+Examples:
+
+       crypto: cypto-controller@ff8a0000 {
+               compatible = "rockchip,crypto";
+               reg = <0xff8a0000 0x4000>;
+               interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
+               clocks = <&cru ACLK_CRYPTO>,
+                        <&cru HCLK_CRYPTO>,
+                        <&cru SRST_CRYPTO>,
+                        <&cru ACLK_DMAC1>;
+
+               clock-names = "aclk_crypto",
+                             "hclk_crypto",
+                             "srst_crypto",
+                                 "apb_pclk";
+               status = "okay";
+       };
-- 
1.9.1


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