1STA350 audio CODEC 2 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 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 20Optional 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 This property has to be specified as '/bits/ 8' value. 29 30 - st,ch1-output-mapping: Channel 1 output mapping 31 - st,ch2-output-mapping: Channel 2 output mapping 32 - st,ch3-output-mapping: Channel 3 output mapping 33 0: Channel 1 34 1: Channel 2 35 2: Channel 3 36 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: string 49 The FFX power output mode selects how the FFX output timing is 50 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: number 57 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 only 61 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 maximum 72 power output is enabled. 73 74 - st,am-reduction-mode: 75 If present, FFX mode runs in AM reduction mode, otherwise normal 76 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 all 80 channels. If not present, normal PWM spped 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 will 91 reach a value lower than -76 dBFS. 92 93 - st,bridge-immediate-off: 94 If present, the bridge will be switched off immediately after the 95 power-down-gpio goes low. Otherwise, the bridge will wait for 13 96 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 are 100 enabled. 101 102 - st,powerdown-master-volume: 103 If present, the power-down pin and I2C power-down functions will 104 act on the master volume. Otherwise, the functions will act on the 105 mute commands. 106 107 - st,powerdown-delay-divider: 108 If present, the bridge power-down time will be divided by the provided 109 value. If not specified, a divider of 1 will be used. Allowed values 110 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-channel 121 // (full-bridge) power, 122 // 2-channel data-out 123 st,ch1-output-mapping = /bits/ 8 <0>; // set channel 1 output ch 1 124 st,ch2-output-mapping = /bits/ 8 <0>; // set channel 2 output ch 1 125 st,ch3-output-mapping = /bits/ 8 <0>; // set channel 3 output ch 1 126 st,max-power-correction; // enables power bridge 127 // correction for THD reduction 128 // near maximum power output 129 st,invalid-input-detect-mute; // mute if no valid digital 130 // audio signal is provided. 131}; 132