[V3,2/2] Documentation: crypto: Add DT binding info for the img hw hash accelerator

Commit Message

James Hartley March 6, 2015, 2:58 a.m. UTC

This adds the binding documentation for the Imagination Technologies
hash accelerator that provides hardware acceleration for
SHA1/SHA224/SHA256/MD5 hashes.  This hardware will be present in
the upcoming pistachio SoC.

Signed-off-by: James Hartley <[e-mail]>
---
 .../devicetree/bindings/crypto/img-hash.txt        |   27 ++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/crypto/img-hash.txt

Patch

diff --git a/Documentation/devicetree/bindings/crypto/img-hash.txt b/Documentation/devicetree/bindings/crypto/img-hash.txt
new file mode 100644
index 0000000..7adc519
--- /dev/null
+++ b/Documentation/devicetree/bindings/crypto/img-hash.txt
@@ -0,0 +1,27 @@ 
+Imagination Technologies hardware hash accelerator
+
+The hash accelerator provides hardware hashing acceleration for
+SHA1, SHA224, SHA256 and MD5 hashes
+
+Required properties:
+
+- compatible : "img,hash-accelerator"
+- reg : Offset and length of the register set for the module, and the DMA port
+- interrupts : The designated IRQ line for the hashing module.
+- dmas : DMA specifier as per Documentation/devicetree/bindings/dma/dma.txt
+- dma-names : Should be "tx"
+- clocks : Clock specifiers
+- clock-names : "hash_clk" Used to clock data through the accelerator
+		"hash_reg_clk" Used to clock the hash block registers
+
+Example:
+
+	hash: hash@18149600 {
+	compatible = "img,hash-accelerator";
+		reg = <0x18149600 0x100, 0x18101100 0x4>;
+		interrupts = <GIC_SHARED 59 IRQ_TYPE_LEVEL_HIGH>;
+		dmas = <&dma 8 0xffffffff>;
+		dma-names = "tx";
+		clocks = <&cr_periph SYS_CLK_HASH>, <&clk_periph PERIPH_CLK_ROM>;
+		clock-names = "hash_clk, hash_reg_clk";
+	};