doc: devicetree: Add bindings documentation for omap-des driver

Add documentation for the generic OMAP DES crypto modul describing the device
tree bindings.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Joel Fernandes <joelf@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/Documentation/devicetree/bindings/crypto/omap-des.txt b/Documentation/devicetree/bindings/crypto/omap-des.txt
new file mode 100644 (file)
index 0000000..e8c63bf
--- /dev/null
+++ b/Documentation/devicetree/bindings/crypto/omap-des.txt
@@ -0,0 +1,30 @@
+OMAP SoC DES crypto Module
+
+Required properties:
+
+- compatible : Should contain "ti,omap4-des"
+- ti,hwmods: Name of the hwmod associated with the DES module
+- reg : Offset and length of the register set for the module
+- interrupts : the interrupt-specifier for the DES module
+- clocks : A phandle to the functional clock node of the DES module
+           corresponding to each entry in clock-names
+- clock-names : Name of the functional clock, should be "fck"
+
+Optional properties:
+- dmas: DMA specifiers for tx and rx dma. See the DMA client binding,
+       Documentation/devicetree/bindings/dma/dma.txt
+       Each entry corresponds to an entry in dma-names
+- dma-names: DMA request names should include "tx" and "rx" if present
+
+Example:
+       /* DRA7xx SoC */
+       des: des@480a5000 {
+               compatible = "ti,omap4-des";
+               ti,hwmods = "des";
+               reg = <0x480a5000 0xa0>;
+               interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>;
+               dmas = <&sdma 117>, <&sdma 116>;
+               dma-names = "tx", "rx";
+               clocks = <&l3_iclk_div>;
+               clock-names = "fck";
+       };