Documentation/devicetree/bindings/sound/cs4271.txt

   1 Cirrus Logic CS4271 DT bindings
   2
   3 This driver supports both the I2C and the SPI bus.
   4
   5 Required properties:
   6
   7  - compatible: "cirrus,cs4271"
   8
   9 For required properties on SPI, please consult
  10 Documentation/devicetree/bindings/spi/spi-bus.txt
  11
  12 Required properties on I2C:
  13
  14  - reg: the i2c address
  15
  16
  17 Optional properties:
  18
  19  - reset-gpio:  a GPIO spec to define which pin is connected to the chip's
  20                 !RESET pin
  21  - cirrus,amuteb-eq-bmutec:     When given, the Codec's AMUTEB=BMUTEC flag
  22                                 is enabled.
  23  - cirrus,enable-soft-reset:
  24         The CS4271 requires its LRCLK and MCLK to be stable before its RESET
  25         line is de-asserted. That also means that clocks cannot be changed
  26         without putting the chip back into hardware reset, which also requires
  27         a complete re-initialization of all registers.
  28
  29         One (undocumented) workaround is to assert and de-assert the PDN bit
  30         in the MODE2 register. This workaround can be enabled with this DT
  31         property.
  32
  33         Note that this is not needed in case the clocks are stable
  34         throughout the entire runtime of the codec.
  35
  36 Examples:
  37
  38         codec_i2c: cs4271@10 {
  39                 compatible = "cirrus,cs4271";
  40                 reg = <0x10>;
  41                 reset-gpio = <&gpio 23 0>;
  42         };
  43
  44         codec_spi: cs4271@0 {
  45                 compatible = "cirrus,cs4271";
  46                 reg = <0x0>;
  47                 reset-gpio = <&gpio 23 0>;
  48                 spi-max-frequency = <6000000>;
  49         };
  50