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1STA32X audio CODEC2 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 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 - Vdda-supply: regulator spec, providing 3.3V17 - Vdd3-supply: regulator spec, providing 3.3V18 - Vcc-supply: regulator spec, providing 5V - 26V19 20Optional properties:21 22 - clocks, clock-names: Clock specifier for XTI input clock.23 If specified, the clock will be enabled when the codec is probed,24 and disabled when it is removed. The 'clock-names' must be set to 'xti'.25 26 - st,output-conf: number, Selects the output configuration:27 0: 2-channel (full-bridge) power, 2-channel data-out28 1: 2 (half-bridge). 1 (full-bridge) on-board power29 2: 2 Channel (Full-Bridge) Power, 1 Channel FFX30 3: 1 Channel Mono-Parallel31 If parameter is missing, mode 0 will be enabled.32 This property has to be specified as '/bits/ 8' value.33 34 - st,ch1-output-mapping: Channel 1 output mapping35 - st,ch2-output-mapping: Channel 2 output mapping36 - st,ch3-output-mapping: Channel 3 output mapping37 0: Channel 138 1: Channel 239 2: Channel 340 If parameter is missing, channel 1 is chosen.41 This properties have to be specified as '/bits/ 8' values.42 43 - st,thermal-warning-recover:44 If present, thermal warning recovery is enabled.45 46 - st,fault-detect-recovery:47 If present, fault detect recovery is enabled.48 49 - st,thermal-warning-adjustment:50 If present, thermal warning adjustment is enabled.51 52 - st,fault-detect-recovery:53 If present, then fault recovery will be enabled.54 55 - st,drop-compensation-ns: number56 Only required for "st,ffx-power-output-mode" ==57 "variable-drop-compensation".58 Specifies the drop compensation in nanoseconds.59 The value must be in the range of 0..300, and only60 multiples of 20 are allowed. Default is 140ns.61 62 - st,max-power-use-mpcc:63 If present, then MPCC bits are used for MPC coefficients,64 otherwise standard MPC coefficients are used.65 66 - st,max-power-corr:67 If present, power bridge correction for THD reduction near maximum68 power output is enabled.69 70 - st,am-reduction-mode:71 If present, FFX mode runs in AM reduction mode, otherwise normal72 FFX mode is used.73 74 - st,odd-pwm-speed-mode:75 If present, PWM speed mode run on odd speed mode (341.3 kHz) on all76 channels. If not present, normal PWM spped mode (384 kHz) will be used.77 78 - st,invalid-input-detect-mute:79 If present, automatic invalid input detect mute is enabled.80 81Example:82 83codec: sta32x@38 {84 compatible = "st,sta32x";85 reg = <0x1c>;86 clocks = <&clock>;87 clock-names = "xti";88 reset-gpios = <&gpio1 19 0>;89 power-down-gpios = <&gpio1 16 0>;90 st,output-conf = /bits/ 8 <0x3>; // set output to 2-channel91 // (full-bridge) power,92 // 2-channel data-out93 st,ch1-output-mapping = /bits/ 8 <0>; // set channel 1 output ch 194 st,ch2-output-mapping = /bits/ 8 <0>; // set channel 2 output ch 195 st,ch3-output-mapping = /bits/ 8 <0>; // set channel 3 output ch 196 st,max-power-correction; // enables power bridge97 // correction for THD reduction98 // near maximum power output99 st,invalid-input-detect-mute; // mute if no valid digital100 // audio signal is provided.101};102