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ASoC: dt-bindings: cros_ec_codec: add SHM bindings

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- Add "reg" for binding to shared memory exposed by EC.
- Add "memory-region" for binding to memory region shared by AP.

Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20191017213539.06.I0df85fe54162426e31f60a589d9b461c65df2faa@changeid
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Tzung-Bi Shih 2019-10-17 22:00:11 +08:00 committed by Mark Brown
parent f3e82ad43c
commit 3fe5a963c6
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1 changed files with 20 additions and 0 deletions
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20
Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt
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@ -10,8 +10,26 @@ Required properties:
- compatible: Must contain "google,cros-ec-codec"
- #sound-dai-cells: Should be 1. The cell specifies number of DAIs.
Optional properties:
- reg: Pysical base address and length of shared memory region from EC.
It contains 3 unsigned 32-bit integer. The first 2 integers
combine to become an unsigned 64-bit physical address. The last
one integer is length of the shared memory.
- memory-region: Shared memory region to EC. A "shared-dma-pool". See
../reserved-memory/reserved-memory.txt for details.
Example:
{
...
reserved_mem: reserved_mem {
compatible = "shared-dma-pool";
reg = <0 0x52800000 0 0x100000>;
no-map;
};
}
cros-ec@0 {
compatible = "google,cros-ec-spi";
@ -20,5 +38,7 @@ cros-ec@0 {
cros_ec_codec: ec-codec {
compatible = "google,cros-ec-codec";
#sound-dai-cells = <1>;
reg = <0x0 0x10500000 0x80000>;
memory-region = <&reserved_mem>;
};
};