ARM: sun4i: dt: Add DT bindings documentation for SUN4I Security System

This patch adds documentation for Device-Tree bindings for the
Security System cryptographic accelerator driver.

Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/Documentation/devicetree/bindings/crypto/sun4i-ss.txt b/Documentation/devicetree/bindings/crypto/sun4i-ss.txt
new file mode 100644 (file)
index 0000000..1e02d17
--- /dev/null
+++ b/Documentation/devicetree/bindings/crypto/sun4i-ss.txt
@@ -0,0 +1,19 @@
+* Allwinner Security System found on A20 SoC
+
+Required properties:
+- compatible : Should be "allwinner,sun4i-a10-crypto".
+- reg: Should contain the Security System register location and length.
+- interrupts: Should contain the IRQ line for the Security System.
+- clocks : List of clock specifiers, corresponding to ahb and ss.
+- clock-names : Name of the functional clock, should be
+       * "ahb" : AHB gating clock
+       * "mod" : SS controller clock
+
+Example:
+       crypto: crypto-engine@01c15000 {
+               compatible = "allwinner,sun4i-a10-crypto";
+               reg = <0x01c15000 0x1000>;
+               interrupts = <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>;
+               clocks = <&ahb_gates 5>, <&ss_clk>;
+               clock-names = "ahb", "mod";
+       };