Kernel-3.10.0-957.el7_cs4271

Cirrus Logic CS4271 DT bindings

This driver supports both the I2C and the SPI bus.

Required properties:

• compatible: “cirrus,cs4271”

For required properties on SPI, please consult
Documentation/devicetree/bindings/spi/spi-bus.txt

Required properties on I2C:

• reg: the i2c address

Optional properties:

• reset-gpio: a GPIO spec to define which pin is connected to the chip’s

   !RESET pin
  

• cirrus,amuteb-eq-bmutec: When given, the Codec’s AMUTEB=BMUTEC flag

           is enabled.
  

• cirrus,enable-soft-reset:
  The CS4271 requires its LRCLK and MCLK to be stable before its RESET
  line is de-asserted. That also means that clocks cannot be changed
  without putting the chip back into hardware reset, which also requires
  a complete re-initialization of all registers.

  One (undocumented) workaround is to assert and de-assert the PDN bit
  in the MODE2 register. This workaround can be enabled with this DT
  property.

  Note that this is not needed in case the clocks are stable
  throughout the entire runtime of the codec.

Examples:

codec_i2c: cs4271@10 {
    compatible = "cirrus,cs4271";
    reg = <0x10>;
    reset-gpio = <&gpio 23 0>;
};

codec_spi: cs4271@0 {
    compatible = "cirrus,cs4271";
    reg = <0x0>;
    reset-gpio = <&gpio 23 0>;
    spi-max-frequency = <6000000>;
};