| 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 spped 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. | |
| }; |