Re: [PATCH v1 6/7] ASoC: dt-bindings: rockchip: pdm: Document property 'rockchip,path-map'【请注意，邮件由robherring2@gmail.com代发】

Hi Rob,

On 2021/8/25 0:58, Rob Herring wrote:

On Tue, Aug 24, 2021 at 03:54:15PM +0800, Sugar Zhang wrote:

quoted

This is an optional property to describe data path mapping.

Signed-off-by: Sugar Zhang <redacted>
---

  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

The schema says this is a fixed length array.

Actually, it varies depends on different controller or application. considering the situation:

for 4 channel, we use path0/1, and hw wired to sdi1/3. we can map them to path0/1 as follows:

rockchip,path-map = <1 3>;

quoted

+  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@ff040000 {
-- 
2.7.4

-- 
Best Regards!
张学广/Sugar
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