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Allow up to 24dB digital gain to be applied when using IQAudIO DAC (original DAC, not DAC+) #1458

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Merged
merged 1 commit into from
May 7, 2016
Merged

Allow up to 24dB digital gain to be applied when using IQAudIO DAC (original DAC, not DAC+) #1458

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17 changes: 15 additions & 2 deletions arch/arm/boot/dts/overlays/README
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Original file line number Diff line number Diff line change
Expand Up @@ -490,8 +490,21 @@ Params: <None>

Name: iqaudio-dac
Info: Configures the IQaudio DAC audio card
Load: dtoverlay=iqaudio-dac
Params: <None>
Load: dtoverlay=iqaudio-dac,<param>
Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
Digital volume control. Enable with
"dtoverlay=iqaudio-dac,24db_digital_gain"
(The default behaviour is that the Digital
volume control is limited to a maximum of
0dB. ie. it can attenuate but not provide
gain. For most users, this will be desired
as it will prevent clipping. By appending
the 24db_digital_gain parameter, the Digital
volume control will allow up to 24dB of
gain. If this parameter is enabled, it is the
responsibility of the user to ensure that
the Digital volume control is set to a value
that does not result in clipping/distortion!)


Name: iqaudio-dacplus
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6 changes: 5 additions & 1 deletion arch/arm/boot/dts/overlays/iqaudio-dac-overlay.dts
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Expand Up @@ -30,10 +30,14 @@

fragment@2 {
target = <&sound>;
__overlay__ {
frag2: __overlay__ {
compatible = "iqaudio,iqaudio-dac";
i2s-controller = <&i2s>;
status = "okay";
};
};

__overrides__ {
24db_digital_gain = <&frag2>,"iqaudio,24db_digital_gain?";
};
};