ASoC: img: Add binding document for parallel output controller

Add binding document for Imagination Technologies parallel
output controller

Signed-off-by: Damien.Horsley <Damien.Horsley@imgtec.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/img,parallel-out.txt b/Documentation/devicetree/bindings/sound/img,parallel-out.txt
new file mode 100644 (file)
index 0000000..a3015d2
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/img,parallel-out.txt
@@ -0,0 +1,44 @@
+Imagination Technologies Parallel Output Controller
+
+Required Properties:
+
+  - compatible : Compatible list, must contain "img,parallel-out".
+
+  - #sound-dai-cells : Must be equal to 0
+
+  - reg : Offset and length of the register set for the device.
+
+  - dmas: Contains an entry for each entry in dma-names.
+
+  - dma-names: Must include the following entry:
+       "tx"
+
+  - clocks : Contains an entry for each entry in clock-names.
+
+  - clock-names : Includes the following entries:
+       "sys"   The system clock
+       "ref"   The reference clock
+
+  - resets: Contains a phandle to the parallel out reset signal
+
+  - reset-names: Contains the reset signal name "rst"
+
+Optional Properties:
+
+  - interrupts : Contains the parallel out interrupt, if present
+
+Example:
+
+parallel_out: parallel-out@18100C00 {
+       compatible = "img,parallel-out";
+       reg = <0x18100C00 0x100>;
+       interrupts = <GIC_SHARED 19 IRQ_TYPE_LEVEL_HIGH>;
+       dmas = <&mdc 16 0xffffffff 0>;
+       dma-names = "tx";
+       clocks = <&cr_periph SYS_CLK_PAUD_OUT>,
+                <&clk_core CLK_AUDIO_DAC>;
+       clock-names = "sys", "ref";
+       resets = <&pistachio_reset PISTACHIO_RESET_PRL_OUT>;
+       reset-names = "rst";
+       #sound-dai-cells = <0>;
+};