On Sat, Oct 05, 2019 at 04:55:05PM +0800, Tzung-Bi Shih wrote:
> - Add "ec-shm" for binding to shared memory exposed by EC.
> - Add "memory-region" for binding to memory region shared by AP.
>
> Signed-off-by: Tzung-Bi Shih <tzungbi@xxxxxxxxxx>
> ---
> .../bindings/sound/google,cros-ec-codec.txt | 20 +++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt b/Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt
> index 0ce9fafc78e2..cb46bc082b4b 100644
> --- a/Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt
> +++ b/Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt
> @@ -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:
> +- ec-shm: Shared memory region from EC. It contains 3 unsigned 32-bit
> + integer. The first 2 integers combine to become an unsigned
> + 64-bit address. The last one integer is length of the shared
> + memory.
This is an address accessible to the main CPU? If so, then it really
should be using 'reg' and be translatable.
> +- 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>;
> + ec-shm = <0x0 0x10500000 0x80000>;
> + memory-region = <&reserved_mem>;
> };
> };
> --
> 2.23.0.581.g78d2f28ef7-goog
>
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