| STA350 audio CODEC |
| |
| The driver for this device only supports I2C. |
| |
| Required properties: |
| |
| - compatible: "st,sta350" |
| - reg: the I2C address of the device for I2C |
| - reset-gpios: a GPIO spec for the reset pin. If specified, it will be |
| deasserted before communication to the codec starts. |
| |
| - power-down-gpios: a GPIO spec for the power down pin. If specified, |
| it will be deasserted before communication to the codec |
| starts. |
| |
| - vdd-dig-supply: regulator spec, providing 3.3V |
| - vdd-pll-supply: regulator spec, providing 3.3V |
| - vcc-supply: regulator spec, providing 5V - 26V |
| |
| Optional properties: |
| |
| - st,output-conf: number, Selects the output configuration: |
| 0: 2-channel (full-bridge) power, 2-channel data-out |
| 1: 2 (half-bridge). 1 (full-bridge) on-board power |
| 2: 2 Channel (Full-Bridge) Power, 1 Channel FFX |
| 3: 1 Channel Mono-Parallel |
| If parameter is missing, mode 0 will be enabled. |
| This property has to be specified as '/bits/ 8' value. |
| |
| - st,ch1-output-mapping: Channel 1 output mapping |
| - st,ch2-output-mapping: Channel 2 output mapping |
| - st,ch3-output-mapping: Channel 3 output mapping |
| 0: Channel 1 |
| 1: Channel 2 |
| 2: Channel 3 |
| If parameter is missing, channel 1 is chosen. |
| This properties have to be specified as '/bits/ 8' values. |
| |
| - st,thermal-warning-recover: |
| If present, thermal warning recovery is enabled. |
| |
| - st,thermal-warning-adjustment: |
| If present, thermal warning adjustment is enabled. |
| |
| - st,fault-detect-recovery: |
| If present, then fault recovery will be enabled. |
| |
| - st,ffx-power-output-mode: string |
| The FFX power output mode selects how the FFX output timing is |
| configured. Must be one of these values: |
| - "drop-compensation" |
| - "tapered-compensation" |
| - "full-power-mode" |
| - "variable-drop-compensation" (default) |
| |
| - st,drop-compensation-ns: number |
| Only required for "st,ffx-power-output-mode" == |
| "variable-drop-compensation". |
| Specifies the drop compensation in nanoseconds. |
| The value must be in the range of 0..300, and only |
| multiples of 20 are allowed. Default is 140ns. |
| |
| - st,overcurrent-warning-adjustment: |
| If present, overcurrent warning adjustment is enabled. |
| |
| - st,max-power-use-mpcc: |
| If present, then MPCC bits are used for MPC coefficients, |
| otherwise standard MPC coefficients are used. |
| |
| - st,max-power-corr: |
| If present, power bridge correction for THD reduction near maximum |
| power output is enabled. |
| |
| - st,am-reduction-mode: |
| If present, FFX mode runs in AM reduction mode, otherwise normal |
| FFX mode is used. |
| |
| - st,odd-pwm-speed-mode: |
| If present, PWM speed mode run on odd speed mode (341.3 kHz) on all |
| channels. If not present, normal PWM speed mode (384 kHz) will be used. |
| |
| - st,distortion-compensation: |
| If present, distortion compensation variable uses DCC coefficient. |
| If not present, preset DC coefficient is used. |
| |
| - st,invalid-input-detect-mute: |
| If present, automatic invalid input detect mute is enabled. |
| |
| - st,activate-mute-output: |
| If present, a mute output will be activated in ase the volume will |
| reach a value lower than -76 dBFS. |
| |
| - st,bridge-immediate-off: |
| If present, the bridge will be switched off immediately after the |
| power-down-gpio goes low. Otherwise, the bridge will wait for 13 |
| million clock cycles to pass before shutting down. |
| |
| - st,noise-shape-dc-cut: |
| If present, the noise-shaping technique on the DC cutoff filter are |
| enabled. |
| |
| - st,powerdown-master-volume: |
| If present, the power-down pin and I2C power-down functions will |
| act on the master volume. Otherwise, the functions will act on the |
| mute commands. |
| |
| - st,powerdown-delay-divider: |
| If present, the bridge power-down time will be divided by the provided |
| value. If not specified, a divider of 1 will be used. Allowed values |
| are 1, 2, 4, 8, 16, 32, 64 and 128. |
| This property has to be specified as '/bits/ 8' value. |
| |
| Example: |
| |
| codec: sta350@38 { |
| compatible = "st,sta350"; |
| reg = <0x1c>; |
| reset-gpios = <&gpio1 19 0>; |
| power-down-gpios = <&gpio1 16 0>; |
| st,output-conf = /bits/ 8 <0x3>; // set output to 2-channel |
| // (full-bridge) power, |
| // 2-channel data-out |
| st,ch1-output-mapping = /bits/ 8 <0>; // set channel 1 output ch 1 |
| st,ch2-output-mapping = /bits/ 8 <0>; // set channel 2 output ch 1 |
| st,ch3-output-mapping = /bits/ 8 <0>; // set channel 3 output ch 1 |
| st,max-power-correction; // enables power bridge |
| // correction for THD reduction |
| // near maximum power output |
| st,invalid-input-detect-mute; // mute if no valid digital |
| // audio signal is provided. |
| }; |
