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-rw-r--r--Documentation/devicetree/bindings/sound/sgtl5000.txt13
-rw-r--r--sound/soc/codecs/sgtl5000.c98
2 files changed, 92 insertions, 19 deletions
diff --git a/Documentation/devicetree/bindings/sound/sgtl5000.txt b/Documentation/devicetree/bindings/sound/sgtl5000.txt
index d556dcb8816b..0e5e4eb3ef1b 100644
--- a/Documentation/devicetree/bindings/sound/sgtl5000.txt
+++ b/Documentation/devicetree/bindings/sound/sgtl5000.txt
@@ -7,6 +7,17 @@ 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.
+
+- 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.
+
- VDDA-supply : the regulator provider of VDDA
- VDDIO-supply: the regulator provider of VDDIO
@@ -21,6 +32,8 @@ codec: sgtl5000@0a {
compatible = "fsl,sgtl5000";
reg = <0x0a>;
clocks = <&clks 150>;
+ micbias-resistor-k-ohms = <2>;
+ micbias-voltage-m-volts = <2250>;
VDDA-supply = <&reg_3p3v>;
VDDIO-supply = <&reg_3p3v>;
};
diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index 6bb77d76561b..490404c6b4d8 100644
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -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 +139,8 @@ struct sgtl5000_priv {
struct regmap *regmap;
struct clk *mclk;
int revision;
+ u8 micbias_resistor;
+ u8 micbias_voltage;
};
/*
@@ -145,12 +155,14 @@ 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_BIAS_R_MASK,
+ sgtl5000->micbias_resistor << SGTL5000_BIAS_R_SHIFT);
break;
case SND_SOC_DAPM_PRE_PMD:
@@ -530,16 +542,16 @@ static int sgtl5000_set_dai_sysclk(struct snd_soc_dai *codec_dai,
/*
* set clock according to i2s frame clock,
- * sgtl5000 provide 2 clock sources.
- * 1. sys_mclk. sample freq can only configure to
+ * sgtl5000 provides 2 clock sources:
+ * 1. sys_mclk: sample freq can only be configured to
* 1/256, 1/384, 1/512 of sys_mclk.
- * 2. pll. can derive any audio clocks.
+ * 2. pll: can derive any audio clocks.
*
* clock setting rules:
- * 1. in slave mode, only sys_mclk can use.
- * 2. as constraint by sys_mclk, sample freq should
- * set to 32k, 44.1k and above.
- * 3. using sys_mclk prefer to pll to save power.
+ * 1. in slave mode, only sys_mclk can be used
+ * 2. as constraint by sys_mclk, sample freq should be set to 32 kHz, 44.1 kHz
+ * and above.
+ * 3. usage of sys_mclk is preferred over pll to save power.
*/
static int sgtl5000_set_clock(struct snd_soc_codec *codec, int frame_rate)
{
@@ -549,8 +561,8 @@ static int sgtl5000_set_clock(struct snd_soc_codec *codec, int frame_rate)
/*
* sample freq should be divided by frame clock,
- * if frame clock lower than 44.1khz, sample feq should set to
- * 32khz or 44.1khz.
+ * if frame clock is lower than 44.1 kHz, sample freq should be set to
+ * 32 kHz or 44.1 kHz.
*/
switch (frame_rate) {
case 8000:
@@ -603,7 +615,8 @@ static int sgtl5000_set_clock(struct snd_soc_codec *codec, int frame_rate)
/*
* calculate the divider of mclk/sample_freq,
- * factor of freq =96k can only be 256, since mclk in range (12m,27m)
+ * factor of freq = 96 kHz can only be 256, since mclk is in the range
+ * of 8 MHz - 27 MHz
*/
switch (sgtl5000->sysclk / sys_fs) {
case 256:
@@ -619,7 +632,7 @@ static int sgtl5000_set_clock(struct snd_soc_codec *codec, int frame_rate)
SGTL5000_MCLK_FREQ_SHIFT;
break;
default:
- /* if mclk not satisify the divider, use pll */
+ /* if mclk does not satisfy the divider, use pll */
if (sgtl5000->master) {
clk_ctl |= SGTL5000_MCLK_FREQ_PLL <<
SGTL5000_MCLK_FREQ_SHIFT;
@@ -795,7 +808,7 @@ static int ldo_regulator_enable(struct regulator_dev *dev)
SGTL5000_LINEREG_D_POWERUP,
SGTL5000_LINEREG_D_POWERUP);
- /* when internal ldo enabled, simple digital power can be disabled */
+ /* when internal ldo is enabled, simple digital power can be disabled */
snd_soc_update_bits(codec, SGTL5000_CHIP_ANA_POWER,
SGTL5000_LINREG_SIMPLE_POWERUP,
0);
@@ -1079,7 +1092,7 @@ static bool sgtl5000_readable(struct device *dev, unsigned int reg)
/*
* sgtl5000 has 3 internal power supplies:
* 1. VAG, normally set to vdda/2
- * 2. chargepump, set to different value
+ * 2. charge pump, set to different value
* according to voltage of vdda and vddio
* 3. line out VAG, normally set to vddio/2
*
@@ -1326,8 +1339,13 @@ 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);
+ snd_soc_update_bits(codec, SGTL5000_CHIP_MIC_CTRL,
+ SGTL5000_BIAS_R_MASK,
+ sgtl5000->micbias_voltage << SGTL5000_BIAS_R_SHIFT);
/*
* disable DAP
* TODO:
@@ -1418,9 +1436,10 @@ 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);
+ sgtl5000 = devm_kzalloc(&client->dev, sizeof(*sgtl5000), GFP_KERNEL);
if (!sgtl5000)
return -ENOMEM;
@@ -1470,6 +1489,47 @@ 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;
+ }
+ 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;
+ }
+ }
+
i2c_set_clientdata(client, sgtl5000);
/* Ensure sgtl5000 will start with sane register values */
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