Hi Rob,
On 2021/8/25 0:58, Rob Herring wrote:
On Tue, Aug 24, 2021 at 03:54:15PM +0800, Sugar Zhang wrote:
This is an optional property to describe data path mapping.
Signed-off-by: Sugar Zhang <sugar.zhang@xxxxxxxxxxxxxx>
---
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>;
+ 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
瑞芯微电子股份有限公司
Rockchip Electronics Co., Ltd.
