kernel/Documentation/devicetree/bindings/sound/cs35l35.txt

CS35L35 Boosted Speaker Amplifier

Required properties:

  - compatible : "cirrus,cs35l35"

  - reg : the I2C address of the device for I2C

  - VA-supply, VP-supply : power supplies for the device,
    as covered in
    Documentation/devicetree/bindings/regulator/regulator.txt.

  - interrupts : IRQ line info CS35L35.
    (See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
    for further information relating to interrupt properties)

 - cirrus,boost-ind-nanohenry: Inductor value for boost converter. The value is
    in nH and they can be values of 1000nH, 1200nH, 1500nH, and 2200nH.

Optional properties:
  - reset-gpios : gpio used to reset the amplifier

  - cirrus,stereo-config : Boolean to determine if there are 2 AMPs for a
  Stereo configuration

  - cirrus,audio-channel : Set Location of Audio Signal on Serial Port
  0 = Data Packet received on Left I2S Channel
  1 = Data Packet received on Right I2S Channel

  - cirrus,advisory-channel : Set Location of Advisory Signal on Serial Port
  0 = Data Packet received on Left I2S Channel
  1 = Data Packet received on Right I2S Channel

  - cirrus,shared-boost : Boolean to enable ClassH tracking of Advisory Signal
  if 2 Devices share Boost BST_CTL

  - cirrus,external-boost : Boolean to specify the device is using an external
  boost supply, note that sharing a boost from another cs35l35 would constitute
  using an external supply for the slave device

  - cirrus,sp-drv-strength : Value for setting the Serial Port drive strength
  Table 3-10 of the datasheet lists drive-strength specifications
  0 = 1x (Default)
  1 = .5x
  - cirrus,sp-drv-unused : Determines how unused slots should be driven on the
  Serial Port.
  0 - Hi-Z
  2 - Drive 0's (Default)
  3 - Drive 1's

  - cirrus,bst-pdn-fet-on : Boolean to determine if the Boost PDN control
  powers down with a rectification FET On or Off. If VSPK is supplied
  externally then FET is off.

  - cirrus,boost-ctl-millivolt : Boost Voltage Value.  Configures the boost
    converter's output voltage in mV. The range is from 2600mV to 9000mV with
    increments of 100mV.
    (Default) VP

  - cirrus,boost-peak-milliamp : Boost-converter peak current limit in mA.
  Configures the peak current by monitoring the current through the boost FET.
  Range starts at 1680mA and goes to a maximum of 4480mA with increments of
  110mA.
  (Default) 2.46 Amps

  - cirrus,amp-gain-zc : Boolean to determine if to use Amplifier gain-change
  zero-cross

Optional H/G Algorithm sub-node:

  The cs35l35 node can have a single "cirrus,classh-internal-algo" sub-node
  that will disable automatic control of the internal H/G Algorithm.

  It is strongly recommended that the Datasheet be referenced when adjusting
  or using these Class H Algorithm controls over the internal Algorithm.
  Serious damage can occur to the Device and surrounding components.

  - cirrus,classh-internal-algo : Sub-node for the Internal Class H Algorithm
  See Section 4.3 Internal Class H Algorithm in the Datasheet.
  If not used, the device manages the ClassH Algorithm internally.

Optional properties for the "cirrus,classh-internal-algo" Sub-node

  Section 7.29 Class H Control
  - cirrus,classh-bst-overide : Boolean
  - cirrus,classh-bst-max-limit
  - cirrus,classh-mem-depth

  Section 7.30 Class H Headroom Control
  - cirrus,classh-headroom

  Section 7.31 Class H Release Rate
  - cirrus,classh-release-rate

  Section 7.32 Class H Weak FET Drive Control
  - cirrus,classh-wk-fet-disable
  - cirrus,classh-wk-fet-delay
  - cirrus,classh-wk-fet-thld

  Section 7.34 Class H VP Control
  - cirrus,classh-vpch-auto
  - cirrus,classh-vpch-rate
  - cirrus,classh-vpch-man

Optional Monitor Signal Format sub-node:

  The cs35l35 node can have a single "cirrus,monitor-signal-format" sub-node
  for adjusting the Depth, Location and Frame of the Monitoring Signals
  for Algorithms.

  See Sections 4.8.2 through 4.8.4 Serial-Port Control in the Datasheet

  -cirrus,monitor-signal-format : Sub-node for the Monitor Signaling Formating
  on the I2S Port. Each of the 3 8 bit values in the array contain the settings
  for depth, location, and frame.

  If not used, the defaults for the 6 monitor signals is used.

  Sections 7.44 - 7.53 lists values for the depth, location, and frame
  for each monitoring signal.

  - cirrus,imon : 4 8 bit values to set the depth, location, frame and ADC
  scale of the IMON monitor signal.

  - cirrus,vmon : 3 8 bit values to set the depth, location, and frame
  of the VMON monitor signal.

  - cirrus,vpmon : 3 8 bit values to set the depth, location, and frame
  of the VPMON monitor signal.

  - cirrus,vbstmon : 3 8 bit values to set the depth, location, and frame
  of the VBSTMON monitor signal

  - cirrus,vpbrstat : 3 8 bit values to set the depth, location, and frame
  of the VPBRSTAT monitor signal

  - cirrus,zerofill : 3 8 bit values to set the depth, location, and frame\
  of the ZEROFILL packet in the monitor signal

Example:

cs35l35: cs35l35@20 {
	compatible = "cirrus,cs35l35";
	reg = <0x20>;
	VA-supply = <&dummy_vreg>;
	VP-supply = <&dummy_vreg>;
	reset-gpios = <&axi_gpio 54 0>;
	interrupt-parent = <&gpio8>;
	interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
	cirrus,boost-ctl-millivolt = <9000>;

	cirrus,stereo-config;
	cirrus,audio-channel = <0x00>;
	cirrus,advisory-channel = <0x01>;
	cirrus,shared-boost;

	cirrus,classh-internal-algo {
		cirrus,classh-bst-overide;
		cirrus,classh-bst-max-limit = <0x01>;
		cirrus,classh-mem-depth = <0x01>;
		cirrus,classh-release-rate = <0x08>;
		cirrus,classh-headroom-millivolt = <0x0B>;
		cirrus,classh-wk-fet-disable = <0x01>;
		cirrus,classh-wk-fet-delay = <0x04>;
		cirrus,classh-wk-fet-thld = <0x01>;
		cirrus,classh-vpch-auto = <0x01>;
		cirrus,classh-vpch-rate = <0x02>;
		cirrus,classh-vpch-man = <0x05>;
	};

	/* Depth, Location, Frame */
	cirrus,monitor-signal-format {
		cirrus,imon = /bits/ 8 <0x03 0x00 0x01>;
		cirrus,vmon = /bits/ 8 <0x03 0x00 0x00>;
		cirrus,vpmon = /bits/ 8 <0x03 0x04 0x00>;
		cirrus,vbstmon = /bits/ 8 <0x03 0x04 0x01>;
		cirrus,vpbrstat = /bits/ 8 <0x00 0x04 0x00>;
		cirrus,zerofill = /bits/ 8 <0x00 0x00 0x00>;
	};

};