google,cros-ec-codec.yaml

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    1 # SPDX-License-Identifier: GPL-2.0-only
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/sound/google,cros-ec-codec.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: Audio codec controlled by ChromeOS EC
    8 
    9 maintainers:
   10   - Cheng-Yi Chiang <cychiang@chromium.org>
   11   - Tzung-Bi Shih <tzungbi@google.com>
   12 
   13 description: |
   14   Google's ChromeOS EC codec is a digital mic codec provided by the
   15   Embedded Controller (EC) and is controlled via a host-command
   16   interface.  An EC codec node should only be found inside the "codecs"
   17   subnode of a cros-ec node.
   18   (see Documentation/devicetree/bindings/mfd/google,cros-ec.yaml).
   19 
   20 properties:
   21   compatible:
   22     const: google,cros-ec-codec
   23 
   24   "#sound-dai-cells":
   25     const: 1
   26 
   27   reg:
   28     items:
   29       - description: |
   30           Physical base address and length of shared memory region from EC.
   31           It contains 3 unsigned 32-bit integer. The first 2 integers
   32           combine to become an unsigned 64-bit physical address.
   33           The last one integer is the length of the shared memory.
   34 
   35   memory-region:
   36     maxItems: 1
   37     description: |
   38       Shared memory region to EC.  A "shared-dma-pool".
   39       See ../reserved-memory/reserved-memory.txt for details.
   40 
   41 required:
   42   - compatible
   43   - '#sound-dai-cells'
   44 
   45 additionalProperties: false
   46 
   47 examples:
   48   - |
   49     reserved_mem: reserved-mem@52800000 {
   50         compatible = "shared-dma-pool";
   51         reg = <0x52800000 0x100000>;
   52         no-map;
   53     };
   54     spi {
   55         #address-cells = <1>;
   56         #size-cells = <0>;
   57         cros-ec@0 {
   58             compatible = "google,cros-ec-spi";
   59             reg = <0>;
   60 
   61             codecs {
   62                 #address-cells = <2>;
   63                 #size-cells = <1>;
   64 
   65                 cros_ec_codec: ec-codec@10500000 {
   66                     compatible = "google,cros-ec-codec";
   67                     #sound-dai-cells = <1>;
   68                     reg = <0x0 0x10500000 0x80000>;
   69                     memory-region = <&reserved_mem>;
   70                 };
   71 
   72             };
   73         };
   74     };

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sys/contrib/device-tree/Bindings/sound/google,cros-ec-codec.yaml