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The STA32x chips feature an XTI clock input that needs to be stable before the reset signal is released. Therefore, the chip driver needs to get a handle to the clock. Instead of relying on other parts of the system to enable the clock, let the codec driver grab a handle itself. In order to keep existing boards working, clock support is made optional. Signed-off-by: Daniel Mack <daniel@zonque.org> Signed-off-by: Mark Brown <broonie@kernel.org>
101 lines
3.4 KiB
Text
101 lines
3.4 KiB
Text
STA32X audio CODEC
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The driver for this device only supports I2C.
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Required properties:
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- compatible: "st,sta32x"
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- reg: the I2C address of the device for I2C
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- reset-gpios: a GPIO spec for the reset pin. If specified, it will be
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deasserted before communication to the codec starts.
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- power-down-gpios: a GPIO spec for the power down pin. If specified,
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it will be deasserted before communication to the codec
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starts.
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- Vdda-supply: regulator spec, providing 3.3V
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- Vdd3-supply: regulator spec, providing 3.3V
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- Vcc-supply: regulator spec, providing 5V - 26V
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Optional properties:
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- clocks, clock-names: Clock specifier for XTI input clock.
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If specified, the clock will be enabled when the codec is probed,
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and disabled when it is removed. The 'clock-names' must be set to 'xti'.
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- st,output-conf: number, Selects the output configuration:
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0: 2-channel (full-bridge) power, 2-channel data-out
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1: 2 (half-bridge). 1 (full-bridge) on-board power
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2: 2 Channel (Full-Bridge) Power, 1 Channel FFX
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3: 1 Channel Mono-Parallel
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If parameter is missing, mode 0 will be enabled.
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This property has to be specified as '/bits/ 8' value.
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- st,ch1-output-mapping: Channel 1 output mapping
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- st,ch2-output-mapping: Channel 2 output mapping
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- st,ch3-output-mapping: Channel 3 output mapping
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0: Channel 1
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1: Channel 2
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2: Channel 3
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If parameter is missing, channel 1 is chosen.
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This properties have to be specified as '/bits/ 8' values.
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- st,thermal-warning-recover:
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If present, thermal warning recovery is enabled.
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- st,fault-detect-recovery:
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If present, fault detect recovery is enabled.
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- st,thermal-warning-adjustment:
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If present, thermal warning adjustment is enabled.
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- st,fault-detect-recovery:
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If present, then fault recovery will be enabled.
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- st,drop-compensation-ns: number
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Only required for "st,ffx-power-output-mode" ==
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"variable-drop-compensation".
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Specifies the drop compensation in nanoseconds.
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The value must be in the range of 0..300, and only
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multiples of 20 are allowed. Default is 140ns.
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- st,max-power-use-mpcc:
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If present, then MPCC bits are used for MPC coefficients,
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otherwise standard MPC coefficients are used.
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- st,max-power-corr:
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If present, power bridge correction for THD reduction near maximum
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power output is enabled.
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- st,am-reduction-mode:
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If present, FFX mode runs in AM reduction mode, otherwise normal
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FFX mode is used.
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- st,odd-pwm-speed-mode:
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If present, PWM speed mode run on odd speed mode (341.3 kHz) on all
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channels. If not present, normal PWM spped mode (384 kHz) will be used.
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- st,invalid-input-detect-mute:
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If present, automatic invalid input detect mute is enabled.
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Example:
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codec: sta32x@38 {
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compatible = "st,sta32x";
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reg = <0x1c>;
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clocks = <&clock>;
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clock-names = "xti";
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reset-gpios = <&gpio1 19 0>;
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power-down-gpios = <&gpio1 16 0>;
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st,output-conf = /bits/ 8 <0x3>; // set output to 2-channel
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// (full-bridge) power,
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// 2-channel data-out
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st,ch1-output-mapping = /bits/ 8 <0>; // set channel 1 output ch 1
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st,ch2-output-mapping = /bits/ 8 <0>; // set channel 2 output ch 1
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st,ch3-output-mapping = /bits/ 8 <0>; // set channel 3 output ch 1
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st,max-power-correction; // enables power bridge
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// correction for THD reduction
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// near maximum power output
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st,invalid-input-detect-mute; // mute if no valid digital
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// audio signal is provided.
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};
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