Unverified Commit 25ae1a04 authored by Arnaud Ferraris's avatar Arnaud Ferraris Committed by Mark Brown
Browse files

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



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: default avatarArnaud Ferraris <arnaud.ferraris@collabora.com>
[Samuel: split binding and implementation; move to device probe]
Signed-off-by: default avatarSamuel Holland <samuel@sholland.org>
Link: https://lore.kernel.org/r/20220621035452.60272-3-samuel@sholland.org


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 24e0b04d

sound/soc/sunxi/sun50i-codec-analog.c

+8 −0
Original line number Diff line number Diff line
@@ -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);