[PATCH v2 2/2] audio: sgtl5000: Add MicBias voltage support
From: Jean-Michel Hautbois <hidden>
Date: 2014-10-14 06:43:12
Also in:
alsa-devel
Subsystem:
nxp sgtl5000 driver, open firmware and flattened device tree bindings, sound, sound - soc layer / dynamic audio power management (asoc), the rest · Maintainers:
Fabio Estevam, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Jaroslav Kysela, Takashi Iwai, Liam Girdwood, Mark Brown, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2014-10-14 · Re: [PATCH v2 2/2] audio: sgtl5000: Add MicBias voltage support · Mark Brown <hidden>
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 <redacted> --- Documentation/devicetree/bindings/sound/sgtl5000.txt | 7 ++++++- sound/soc/codecs/sgtl5000.c | 13 +++++++++++++ 2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/sound/sgtl5000.txt b/Documentation/devicetree/bindings/sound/sgtl5000.txt
index d6ec927..1aab403 100644
--- a/Documentation/devicetree/bindings/sound/sgtl5000.txt
+++ b/Documentation/devicetree/bindings/sound/sgtl5000.txt@@ -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>; };
diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index b2c2ed7..8611cfb 100644
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c@@ -140,6 +140,7 @@ struct sgtl5000_priv { struct clk *mclk; int revision; u8 micbias_resistor; + u8 micbias_voltage; }; /*
@@ -1341,6 +1342,9 @@ 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:
@@ -1510,10 +1514,19 @@ 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; } }
--
2.1.1
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