Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt

   1 Audio codec controlled by ChromeOS EC
   2
   3 Google's ChromeOS EC codec is a digital mic codec provided by the
   4 Embedded Controller (EC) and is controlled via a host-command interface.
   5
   6 An EC codec node should only be found as a sub-node of the EC node (see
   7 Documentation/devicetree/bindings/mfd/cros-ec.txt).
   8
   9 Required properties:
  10 - compatible: Must contain "google,cros-ec-codec"
  11 - #sound-dai-cells: Should be 1. The cell specifies number of DAIs.
  12
  13 Optional properties:
  14 - reg: Pysical base address and length of shared memory region from EC.
  15        It contains 3 unsigned 32-bit integer.  The first 2 integers
  16        combine to become an unsigned 64-bit physical address.  The last
  17        one integer is length of the shared memory.
  18 - memory-region: Shared memory region to EC.  A "shared-dma-pool".  See
  19                  ../reserved-memory/reserved-memory.txt for details.
  20
  21 Example:
  22
  23 {
  24         ...
  25
  26         reserved_mem: reserved_mem {
  27                 compatible = "shared-dma-pool";
  28                 reg = <0 0x52800000 0 0x100000>;
  29                 no-map;
  30         };
  31 }
  32
  33 cros-ec@0 {
  34         compatible = "google,cros-ec-spi";
  35
  36         ...
  37
  38         cros_ec_codec: ec-codec {
  39                 compatible = "google,cros-ec-codec";
  40                 #sound-dai-cells = <1>;
  41                 reg = <0x0 0x10500000 0x80000>;
  42                 memory-region = <&reserved_mem>;
  43         };
  44 };