1STA32X audio CODEC 2 3The driver for this device only supports I2C. 4 5Required properties: 6 7 - compatible: "st,sta32x" 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 - Vdda-supply: regulator spec, providing 3.3V 17 - Vdd3-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,drop-compensation-ns: number 49 Only required for "st,ffx-power-output-mode" == 50 "variable-drop-compensation". 51 Specifies the drop compensation in nanoseconds. 52 The value must be in the range of 0..300, and only 53 multiples of 20 are allowed. Default is 140ns. 54 55 - st,max-power-use-mpcc: 56 If present, then MPCC bits are used for MPC coefficients, 57 otherwise standard MPC coefficients are used. 58 59 - st,max-power-corr: 60 If present, power bridge correction for THD reduction near maximum 61 power output is enabled. 62 63 - st,am-reduction-mode: 64 If present, FFX mode runs in AM reduction mode, otherwise normal 65 FFX mode is used. 66 67 - st,odd-pwm-speed-mode: 68 If present, PWM speed mode run on odd speed mode (341.3 kHz) on all 69 channels. If not present, normal PWM spped mode (384 kHz) will be used. 70 71 - st,invalid-input-detect-mute: 72 If present, automatic invalid input detect mute is enabled. 73 74Example: 75 76codec: sta32x@38 { 77 compatible = "st,sta32x"; 78 reg = <0x1c>; 79 reset-gpios = <&gpio1 19 0>; 80 power-down-gpios = <&gpio1 16 0>; 81 st,output-conf = /bits/ 8 <0x3>; // set output to 2-channel 82 // (full-bridge) power, 83 // 2-channel data-out 84 st,ch1-output-mapping = /bits/ 8 <0>; // set channel 1 output ch 1 85 st,ch2-output-mapping = /bits/ 8 <0>; // set channel 2 output ch 1 86 st,ch3-output-mapping = /bits/ 8 <0>; // set channel 3 output ch 1 87 st,max-power-correction; // enables power bridge 88 // correction for THD reduction 89 // near maximum power output 90 st,invalid-input-detect-mute; // mute if no valid digital 91 // audio signal is provided. 92}; 93