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ASoC: sun50i-codec-analog: Add support for internal bias

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In order to properly bias headset microphones, there should be a pull-up
resistor between pins HBIAS and MIC2P. This can be an external resistor,
but the codec also provides an internal 2.2K resistor which is enabled
by a register.

This patch enables or disables the internal bias resistor based on a
device tree property.

Signed-off-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>
[Samuel: split binding and implementation; move to device probe]
Signed-off-by: Samuel Holland <samuel@sholland.org>
Link: https://lore.kernel.org/r/20220621035452.60272-3-samuel@sholland.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Arnaud Ferraris
2022-06-20 22:54:51 -05:00
committed by Mark Brown
parent 24e0b04dd4
commit 25ae1a04da
1 changed files with 8 additions and 0 deletions
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8
sound/soc/sunxi/sun50i-codec-analog.c
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@@ -117,6 +117,7 @@
#define SUN50I_ADDA_HS_MBIAS_CTRL_MMICBIASEN 7
#define SUN50I_ADDA_JACK_MIC_CTRL 0x1d
#define SUN50I_ADDA_JACK_MIC_CTRL_INNERRESEN 6
#define SUN50I_ADDA_JACK_MIC_CTRL_HMICBIASEN 5
/* mixer controls */
@@ -507,6 +508,7 @@ static int sun50i_codec_analog_probe(struct platform_device *pdev)
{
struct regmap *regmap;
void __iomem *base;
bool enable;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base)) {
@@ -520,6 +522,12 @@ static int sun50i_codec_analog_probe(struct platform_device *pdev)
return PTR_ERR(regmap);
}
enable = device_property_read_bool(&pdev->dev,
"allwinner,internal-bias-resistor");
regmap_update_bits(regmap, SUN50I_ADDA_JACK_MIC_CTRL,
BIT(SUN50I_ADDA_JACK_MIC_CTRL_INNERRESEN),
enable << SUN50I_ADDA_JACK_MIC_CTRL_INNERRESEN);
return devm_snd_soc_register_component(&pdev->dev,
&sun50i_codec_analog_cmpnt_drv,
NULL, 0);