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1STA350 audio CODEC2 3The driver for this device only supports I2C.4 5Required properties:6 7 - compatible: "st,sta350"8 - reg: the I2C address of the device for I2C9 - reset-gpios: a GPIO spec for the reset pin. If specified, it will be10 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 codec14 starts.15 16 - vdd-dig-supply: regulator spec, providing 3.3V17 - vdd-pll-supply: regulator spec, providing 3.3V18 - vcc-supply: regulator spec, providing 5V - 26V19 20Optional properties:21 22 - st,output-conf: number, Selects the output configuration:23 0: 2-channel (full-bridge) power, 2-channel data-out24 1: 2 (half-bridge). 1 (full-bridge) on-board power25 2: 2 Channel (Full-Bridge) Power, 1 Channel FFX26 3: 1 Channel Mono-Parallel27 If parameter is missing, mode 0 will be enabled.28 This property has to be specified as '/bits/ 8' value.29 30 - st,ch1-output-mapping: Channel 1 output mapping31 - st,ch2-output-mapping: Channel 2 output mapping32 - st,ch3-output-mapping: Channel 3 output mapping33 0: Channel 134 1: Channel 235 2: Channel 336 If parameter is missing, channel 1 is chosen.37 This properties have to be specified as '/bits/ 8' values.38 39 - st,thermal-warning-recover:40 If present, thermal warning recovery is enabled.41 42 - st,thermal-warning-adjustment:43 If present, thermal warning adjustment is enabled.44 45 - st,fault-detect-recovery:46 If present, then fault recovery will be enabled.47 48 - st,ffx-power-output-mode: string49 The FFX power output mode selects how the FFX output timing is50 configured. Must be one of these values:51 - "drop-compensation"52 - "tapered-compensation"53 - "full-power-mode"54 - "variable-drop-compensation" (default)55 56 - st,drop-compensation-ns: number57 Only required for "st,ffx-power-output-mode" ==58 "variable-drop-compensation".59 Specifies the drop compensation in nanoseconds.60 The value must be in the range of 0..300, and only61 multiples of 20 are allowed. Default is 140ns.62 63 - st,overcurrent-warning-adjustment:64 If present, overcurrent warning adjustment is enabled.65 66 - st,max-power-use-mpcc:67 If present, then MPCC bits are used for MPC coefficients,68 otherwise standard MPC coefficients are used.69 70 - st,max-power-corr:71 If present, power bridge correction for THD reduction near maximum72 power output is enabled.73 74 - st,am-reduction-mode:75 If present, FFX mode runs in AM reduction mode, otherwise normal76 FFX mode is used.77 78 - st,odd-pwm-speed-mode:79 If present, PWM speed mode run on odd speed mode (341.3 kHz) on all80 channels. If not present, normal PWM speed mode (384 kHz) will be used.81 82 - st,distortion-compensation:83 If present, distortion compensation variable uses DCC coefficient.84 If not present, preset DC coefficient is used.85 86 - st,invalid-input-detect-mute:87 If present, automatic invalid input detect mute is enabled.88 89 - st,activate-mute-output:90 If present, a mute output will be activated in ase the volume will91 reach a value lower than -76 dBFS.92 93 - st,bridge-immediate-off:94 If present, the bridge will be switched off immediately after the95 power-down-gpio goes low. Otherwise, the bridge will wait for 1396 million clock cycles to pass before shutting down.97 98 - st,noise-shape-dc-cut:99 If present, the noise-shaping technique on the DC cutoff filter are100 enabled.101 102 - st,powerdown-master-volume:103 If present, the power-down pin and I2C power-down functions will104 act on the master volume. Otherwise, the functions will act on the105 mute commands.106 107 - st,powerdown-delay-divider:108 If present, the bridge power-down time will be divided by the provided109 value. If not specified, a divider of 1 will be used. Allowed values110 are 1, 2, 4, 8, 16, 32, 64 and 128.111 This property has to be specified as '/bits/ 8' value.112 113Example:114 115codec: sta350@38 {116 compatible = "st,sta350";117 reg = <0x1c>;118 reset-gpios = <&gpio1 19 0>;119 power-down-gpios = <&gpio1 16 0>;120 st,output-conf = /bits/ 8 <0x3>; // set output to 2-channel121 // (full-bridge) power,122 // 2-channel data-out123 st,ch1-output-mapping = /bits/ 8 <0>; // set channel 1 output ch 1124 st,ch2-output-mapping = /bits/ 8 <0>; // set channel 2 output ch 1125 st,ch3-output-mapping = /bits/ 8 <0>; // set channel 3 output ch 1126 st,max-power-correction; // enables power bridge127 // correction for THD reduction128 // near maximum power output129 st,invalid-input-detect-mute; // mute if no valid digital130 // audio signal is provided.131};132