p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

ASoC: sgtl5000: Add MicBias voltage support 

Some systems may require to specify a bias different than default (1.25V).
This adds a property in sgtl5000 codec.
The property is specified in milli-volts so that it is coherent with datasheet.

Signed-off-by: Jean-Michel Hautbois <jean-michel.hautbois@vodalys.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jean-Michel Hautbois 2014-10-14 08:43:12 +02:00 committed by Mark Brown
parent bd0593f5f6
commit 8735779774
2 changed files with 19 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
Documentation/devicetree/bindings/sound/sgtl5000.txt
View File

@ -13,6 +13,10 @@ Required properties:
If this node is not mentioned or if the value is unknown, then
micbias resistor is set to 4K.
- micbias-voltage-m-volts : the bias voltage to be used in mVolts
The voltage can take values from 1.25V to 3V by 250mV steps
If this node is not mentionned or the value is unknown, then
the value is set to 1.25V.
Example:
@ -20,5 +24,6 @@ codec: sgtl5000@0a {
compatible = "fsl,sgtl5000";
reg = <0x0a>;
clocks = <&clks 150>;
sgtl5000-micbias-resistor = <1>;
micbias-resistor-k-ohms = <2>;
micbias-voltage-m-volts = <2250>;
};

13
sound/soc/codecs/sgtl5000.c
View File

@ -140,6 +140,7 @@ struct sgtl5000_priv {
struct clk *mclk;
int revision;
u8 micbias_resistor;
u8 micbias_voltage;
};
/*
@ -1342,6 +1343,9 @@ static int sgtl5000_probe(struct snd_soc_codec *codec)
SGTL5000_BIAS_R_MASK,
sgtl5000->micbias_resistor << SGTL5000_BIAS_R_SHIFT);
snd_soc_update_bits(codec, SGTL5000_CHIP_MIC_CTRL,
SGTL5000_BIAS_R_MASK,
sgtl5000->micbias_voltage << SGTL5000_BIAS_R_SHIFT);
/*
* disable DAP
* TODO:
@ -1511,10 +1515,19 @@ static int sgtl5000_i2c_probe(struct i2c_client *client,
/* default is 4Kohms */
sgtl5000->micbias_resistor = 2;
}
if (!of_property_read_u32(np,
"micbias-voltage-m-volts", &value)) {
/* 1250mV => 0 */
/* steps of 250mV */
if ((value >= 1250) && (value <= 3000))
sgtl5000->micbias_voltage = (value / 250) - 5;
else {
sgtl5000->micbias_voltage = 0;
dev_err(&client->dev,
"Unsuitable MicBias resistor\n");
}
} else {
sgtl5000->micbias_voltage = 0;
}
}