Documentation/devicetree/bindings/sound/st,sta350.txt

   1 STA350 audio CODEC
   2
   3 The driver for this device only supports I2C.
   4
   5 Required properties:
   6
   7   - compatible: "st,sta350"
   8   - reg: the I2C address of the device for I2C
   9   - reset-gpios: a GPIO spec for the reset pin. If specified, it will be
  10                  deasserted before communication to the codec starts.
  11
  12   - power-down-gpios: a GPIO spec for the power down pin. If specified,
  13                       it will be deasserted before communication to the codec
  14                       starts.
  15
  16   - vdd-dig-supply: regulator spec, providing 3.3V
  17   - vdd-pll-supply: regulator spec, providing 3.3V
  18   - vcc-supply: regulator spec, providing 5V - 26V
  19
  20 Optional properties:
  21
  22   -  st,output-conf: number, Selects the output configuration:
  23         0: 2-channel (full-bridge) power, 2-channel data-out
  24         1: 2 (half-bridge). 1 (full-bridge) on-board power
  25         2: 2 Channel (Full-Bridge) Power, 1 Channel FFX
  26         3: 1 Channel Mono-Parallel
  27         If parameter is missing, mode 0 will be enabled.
  28
  29   -  st,ch1-output-mapping: Channel 1 output mapping
  30   -  st,ch2-output-mapping: Channel 2 output mapping
  31   -  st,ch3-output-mapping: Channel 3 output mapping
  32         0: Channel 1
  33         1: Channel 2
  34         2: Channel 3
  35         If parameter is missing, channel 1 is choosen.
  36
  37   -  st,thermal-warning-recover:
  38         If present, thermal warning recovery is enabled.
  39
  40   -  st,thermal-warning-adjustment:
  41         If present, thermal warning adjustment is enabled.
  42
  43   -  st,fault-detect-recovery:
  44         If present, then fault recovery will be enabled.
  45
  46   -  st,ffx-power-output-mode: string
  47         The FFX power output mode selects how the FFX output timing is
  48         configured. Must be one of these values:
  49           -  "drop-compensation"
  50           -  "tapered-compensation"
  51           -  "full-power-mode"
  52           -  "variable-drop-compensation" (default)
  53
  54   -  st,drop-compensation-ns: number
  55         Only required for "st,ffx-power-output-mode" ==
  56         "variable-drop-compensation".
  57         Specifies the drop compensation in nanoseconds.
  58         The value must be in the range of 0..300, and only
  59         multiples of 20 are allowed. Default is 140ns.
  60
  61   -  st,overcurrent-warning-adjustment:
  62         If present, overcurrent warning adjustment is enabled.
  63
  64   -  st,max-power-use-mpcc:
  65         If present, then MPCC bits are used for MPC coefficients,
  66         otherwise standard MPC coefficients are used.
  67
  68   -  st,max-power-corr:
  69         If present, power bridge correction for THD reduction near maximum
  70         power output is enabled.
  71
  72   -  st,am-reduction-mode:
  73         If present, FFX mode runs in AM reduction mode, otherwise normal
  74         FFX mode is used.
  75
  76   -  st,odd-pwm-speed-mode:
  77         If present, PWM speed mode run on odd speed mode (341.3 kHz) on all
  78         channels. If not present, normal PWM spped mode (384 kHz) will be used.
  79
  80   -  st,distortion-compensation:
  81         If present, distortion compensation variable uses DCC coefficient.
  82         If not present, preset DC coefficient is used.
  83
  84   -  st,invalid-input-detect-mute:
  85         If not present, automatic invalid input detect mute is enabled.
  86
  87
  88
  89 Example:
  90
  91 codec: sta350@38 {
  92         compatible = "st,sta350";
  93         reg = <0x1c>;
  94         reset-gpios = <&gpio1 19 0>;
  95         power-down-gpios = <&gpio1 16 0>;
  96         st,output-conf = <0x3>;                 // set output to 2-channel
  97                                                 // (full-bridge) power,
  98                                                 // 2-channel data-out
  99         st,ch1-output-mapping = <0>;            // set channel 1 output ch 1
 100         st,ch2-output-mapping = <0>;            // set channel 2 output ch 1
 101         st,ch3-output-mapping = <0>;            // set channel 3 output ch 1
 102         st,max-power-correction;                // enables power bridge
 103                                                 // correction for THD reduction
 104                                                 // near maximum power output
 105         st,invalid-input-detect-mute;           // mute if no valid digital
 106                                                 // audio signal is provided.
 107 };