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Commit bd0593f5 authored by Jean-Michel Hautbois's avatar Jean-Michel Hautbois Committed by Mark Brown
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ASoC: sgtl5000: Add MicBias resistor support in DT 



Some systems may require a different resistor than the default one (4K).
This adds a property in sgtl5000 codec.
It keeps the default of 4K when nothing is specified so it does not break
existing code.

Signed-off-by: default avatarJean-Michel Hautbois <jean-michel.hautbois@vodalys.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 7f6d75d7

Documentation/devicetree/bindings/sound/sgtl5000.txt

+8 −0
Original line number Diff line number Diff line
@@ -7,10 +7,18 @@ Required properties: 


- clocks : the clock provider of SYS_MCLK



- micbias-resistor-k-ohms : the bias resistor to be used in kOmhs

	The resistor can take values of 2k, 4k or 8k.

	If set to 0 it will be off.

	If this node is not mentioned or if the value is unknown, then

	micbias	resistor is set to 4K.





Example:



codec: sgtl5000@0a {

	compatible = "fsl,sgtl5000";

	reg = <0x0a>;

	clocks = <&clks 150>;

	sgtl5000-micbias-resistor = <1>;

};

sound/soc/codecs/sgtl5000.c

+51 −4
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/pm.h>

#include <linux/i2c.h>

#include <linux/clk.h>

#include <linux/log2.h>

#include <linux/regmap.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/machine.h>
@@ -121,6 +122,13 @@ struct ldo_regulator { 
	bool enabled;

};



enum sgtl5000_micbias_resistor {

	SGTL5000_MICBIAS_OFF = 0,

	SGTL5000_MICBIAS_2K = 2,

	SGTL5000_MICBIAS_4K = 4,

	SGTL5000_MICBIAS_8K = 8,

};



/* sgtl5000 private structure in codec */

struct sgtl5000_priv {

	int sysclk;	/* sysclk rate */
@@ -131,6 +139,7 @@ struct sgtl5000_priv { 
	struct regmap *regmap;

	struct clk *mclk;

	int revision;

	u8 micbias_resistor;

};



/*
@@ -145,12 +154,14 @@ struct sgtl5000_priv { 
static int mic_bias_event(struct snd_soc_dapm_widget *w,

	struct snd_kcontrol *kcontrol, int event)

{

	struct sgtl5000_priv *sgtl5000 = snd_soc_codec_get_drvdata(w->codec);



	switch (event) {

	case SND_SOC_DAPM_POST_PMU:

		/* change mic bias resistor to 4Kohm */

		/* change mic bias resistor */

		snd_soc_update_bits(w->codec, SGTL5000_CHIP_MIC_CTRL,

			SGTL5000_BIAS_R_MASK,

				SGTL5000_BIAS_R_4k << SGTL5000_BIAS_R_SHIFT);

			sgtl5000->micbias_resistor << SGTL5000_BIAS_R_SHIFT);

		break;



	case SND_SOC_DAPM_PRE_PMD:
@@ -1327,7 +1338,9 @@ static int sgtl5000_probe(struct snd_soc_codec *codec) 
			SGTL5000_HP_ZCD_EN |

			SGTL5000_ADC_ZCD_EN);



	snd_soc_write(codec, SGTL5000_CHIP_MIC_CTRL, 2);

	snd_soc_update_bits(codec, SGTL5000_CHIP_MIC_CTRL,

			SGTL5000_BIAS_R_MASK,

			sgtl5000->micbias_resistor << SGTL5000_BIAS_R_SHIFT);



	/*

	 * disable DAP
@@ -1419,6 +1432,8 @@ static int sgtl5000_i2c_probe(struct i2c_client *client, 
	struct sgtl5000_priv *sgtl5000;

	int ret, reg, rev;

	unsigned int mclk;

	struct device_node *np = client->dev.of_node;

	u32 value;



	sgtl5000 = devm_kzalloc(&client->dev, sizeof(struct sgtl5000_priv),

								GFP_KERNEL);
@@ -1471,6 +1486,38 @@ static int sgtl5000_i2c_probe(struct i2c_client *client, 
	dev_info(&client->dev, "sgtl5000 revision 0x%x\n", rev);

	sgtl5000->revision = rev;



	if (np) {

		if (!of_property_read_u32(np,

			"micbias-resistor-k-ohms", &value)) {

			switch (value) {

			case SGTL5000_MICBIAS_OFF:

				sgtl5000->micbias_resistor = 0;

				break;

			case SGTL5000_MICBIAS_2K:

				sgtl5000->micbias_resistor = 1;

				break;

			case SGTL5000_MICBIAS_4K:

				sgtl5000->micbias_resistor = 2;

				break;

			case SGTL5000_MICBIAS_8K:

				sgtl5000->micbias_resistor = 3;

				break;

			default:

				sgtl5000->micbias_resistor = 2;

				dev_err(&client->dev,

					"Unsuitable MicBias resistor\n");

			}

		} else {

			/* default is 4Kohms */

			sgtl5000->micbias_resistor = 2;

		}

				dev_err(&client->dev,

					"Unsuitable MicBias resistor\n");

			}

		} else {

		}

	}



	i2c_set_clientdata(client, sgtl5000);



	/* Ensure sgtl5000 will start with sane register values */