[PATCH v4 6/7] ASoC: dt-bindings: rockchip: pdm: Document property 'rockchip, path-map'

[Sugar Zhang]

This is an optional property to describe data path mapping.

Signed-off-by: Sugar Zhang <sugar.zhang at rock-chips.com>
Acked-by: Rob Herring <robh at kernel.org>
---

Changes in v4: None
Changes in v3: None
Changes in v2: None

 Documentation/devicetree/bindings/sound/rockchip,pdm.txt | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/rockchip,pdm.txt b/Documentation/devicetree/bindings/sound/rockchip,pdm.txt
index 54d94438..b2d7e47 100644
--- a/Documentation/devicetree/bindings/sound/rockchip,pdm.txt
+++ b/Documentation/devicetree/bindings/sound/rockchip,pdm.txt
@@ -24,6 +24,22 @@ Required properties:
 	     pinctrl-names. See ../pinctrl/pinctrl-bindings.txt
 	     for details of the property values.
 
+Optional properties:
+- rockchip,path-map: This is a variable length array, that shows the mapping
+  of SDIx to PATHx. By default, they are one-to-one mapping as follows:
+
+   path0 <-- sdi0
+   path1 <-- sdi1
+   path2 <-- sdi2
+   path3 <-- sdi3
+
+  e.g. "rockchip,path-map = <3 2 1 0>" means the mapping as follows:
+
+   path0 <-- sdi3
+   path1 <-- sdi2
+   path2 <-- sdi1
+   path3 <-- sdi0
+
 Example for rk3328 PDM controller:
 
 pdm: pdm at ff040000 {
-- 
2.7.4