ARM: dts: AM33XX: Add SHAM data and documentation

Add the generic AM33XX SHAM module's device tree data and
enable it for the am335x-evm, am335x-evmsk, and am335x-bone
platforms.  Also add Documentation file describing the data
for the SHAM module.

Cc: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Joel Fernandes <joelf@ti.com>
[joelf@ti.com: Dropped interrupt-parent property, documentation fixups]
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Benoit Cousson <bcousson@baylibre.com>

Documentation/devicetree/bindings/crypto/omap-sham.txt

+OMAP SoC SHA crypto Module
+
+Required properties:
+
+- compatible : Should contain entries for this and backward compatible
+  SHAM versions:
+  - "ti,omap2-sham" for OMAP2 & OMAP3.
+  - "ti,omap4-sham" for OMAP4 and AM33XX.
+  Note that these two versions are incompatible.
+- ti,hwmods: Name of the hwmod associated with the SHAM module
+- reg : Offset and length of the register set for the module
+- interrupts : the interrupt-specifier for the SHAM module.
+
+Optional properties:
+- dmas: DMA specifiers for the rx dma. See the DMA client binding,
+	Documentation/devicetree/bindings/dma/dma.txt
+- dma-names: DMA request name. Should be "rx" if a dma is present.
+
+Example:
+	/* AM335x */
+	sham: sham@53100000 {
+		compatible = "ti,omap4-sham";
+		ti,hwmods = "sham";
+		reg = <0x53100000 0x200>;
+		interrupts = <109>;
+		dmas = <&edma 36>;
+		dma-names = "rx";
+	};

arch/arm/boot/dts/am335x-bone.dts

@@ -19,3 +19,7 @@ &ldo3_reg {
 &mmc1 {
 	vmmc-supply = <&ldo3_reg>;
 };
+
+&sham {
+	status = "okay";
+};

arch/arm/boot/dts/am335x-evm.dts

@@ -523,3 +523,7 @@ &mmc1 {
 	vmmc-supply = <&vmmc_reg>;
 	bus-width = <4>;
 };
+
+&sham {
+	status = "okay";
+};

arch/arm/boot/dts/am335x-evmsk.dts

@@ -425,3 +425,7 @@ &mmc1 {
 	vmmc-supply = <&vmmc_reg>;
 	bus-width = <4>;
 };
+
+&sham {
+	status = "okay";
+};

arch/arm/boot/dts/am33xx.dtsi

@@ -712,5 +712,14 @@ gpmc: gpmc@50000000 {
 			#size-cells = <1>;
 			status = "disabled";
 		};
+
+		sham: sham@53100000 {
+			compatible = "ti,omap4-sham";
+			ti,hwmods = "sham";
+			reg = <0x53100000 0x200>;
+			interrupts = <109>;
+			dmas = <&edma 36>;
+			dma-names = "rx";
+		};
 	};
 };