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.
};
