dma: rcar-audmapp: add DT support

This patch adds DT support to Audio DMAC peri peri driver.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
[horms+renesas@verge.net.au: Do not add trailing blank line to rcar-audmapp.txt]
[horms+renesas@verge.net.au: squashed patch to add NULL terminater to audmapp_of_match]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 29 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/dma/rcar-audmapp.txt b/Documentation/devicetree/bindings/dma/rcar-audmapp.txt
new file mode 100644
index 000000000000..9f1d750d76de
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/rcar-audmapp.txt
@@ -0,0 +1,29 @@
+* R-Car Audio DMAC peri peri Device Tree bindings
+
+Required properties:
+- compatible:   should be "renesas,rcar-audmapp"
+- #dma-cells:   should be <1>, see "dmas" property below
+
+Example:
+        audmapp: audio-dma-pp@0xec740000 {
+                compatible = "renesas,rcar-audmapp";
+                #dma-cells = <1>;
+
+                reg = <0 0xec740000 0 0x200>;
+        };
+
+
+* DMA client
+
+Required properties:
+- dmas:         a list of <[DMA multiplexer phandle] [SRS/DRS value]> pairs,
+                where SRS/DRS values are fixed handles, specified in the SoC
+                manual as the value that would be written into the PDMACHCR.
+- dma-names:    a list of DMA channel names, one per "dmas" entry
+
+Example:
+
+        dmas = <&audmapp 0x2d00
+                &audmapp 0x3700>;
+        dma-names =  "src0_ssiu0",
+                     "dvc0_ssiu0";