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ASoC: tlv320aic32x4: Support for master clock 

Add support for a master clock passed through DT. The master clock of
the codec is only active when the codec is in use.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Markus Pargmann 2014-02-20 18:22:58 +01:00 committed by Mark Brown
parent 4d16700dd9
commit 98b664e2ce
2 changed files with 25 additions and 0 deletions
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4
Documentation/devicetree/bindings/sound/tlv320aic32x4.txt
View File

@ -8,6 +8,8 @@ Required properties:
Optional properties:
- reset-gpios: Reset-GPIO phandle with args as described in gpio/gpio.txt
- clocks/clock-names: Clock named 'mclk' for the master clock of the codec.
See clock/clock-bindings.txt for information about the detailed format.
Example:
@ -15,4 +17,6 @@ Example:
codec: tlv320aic32x4@18 {
compatible = "ti,tlv320aic32x4";
reg = <0x18>;
clocks = <&clks 201>;
clock-names = "mclk";
};

21
sound/soc/codecs/tlv320aic32x4.c
View File

@ -33,6 +33,7 @@
#include <linux/i2c.h>
#include <linux/cdev.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <sound/tlv320aic32x4.h>
#include <sound/core.h>
@ -67,6 +68,7 @@ struct aic32x4_priv {
u32 micpga_routing;
bool swapdacs;
int rstn_gpio;
struct clk *mclk;
};
/* 0dB min, 0.5dB steps */
@ -487,8 +489,18 @@ static int aic32x4_mute(struct snd_soc_dai *dai, int mute)
static int aic32x4_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
struct aic32x4_priv *aic32x4 = snd_soc_codec_get_drvdata(codec);
int ret;
switch (level) {
case SND_SOC_BIAS_ON:
/* Switch on master clock */
ret = clk_prepare_enable(aic32x4->mclk);
if (ret) {
dev_err(codec->dev, "Failed to enable master clock\n");
return ret;
}
/* Switch on PLL */
snd_soc_update_bits(codec, AIC32X4_PLLPR,
AIC32X4_PLLEN, AIC32X4_PLLEN);
@ -539,6 +551,9 @@ static int aic32x4_set_bias_level(struct snd_soc_codec *codec,
/* Switch off BCLK_N Divider */
snd_soc_update_bits(codec, AIC32X4_BCLKN,
AIC32X4_BCLKEN, 0);
/* Switch off master clock */
clk_disable_unprepare(aic32x4->mclk);
break;
case SND_SOC_BIAS_OFF:
break;
@ -717,6 +732,12 @@ static int aic32x4_i2c_probe(struct i2c_client *i2c,
aic32x4->rstn_gpio = -1;
}
aic32x4->mclk = devm_clk_get(&i2c->dev, "mclk");
if (IS_ERR(aic32x4->mclk)) {
dev_err(&i2c->dev, "Failed getting the mclk. The current implementation does not support the usage of this codec without mclk\n");
return PTR_ERR(aic32x4->mclk);
}
if (gpio_is_valid(aic32x4->rstn_gpio)) {
ret = devm_gpio_request_one(&i2c->dev, aic32x4->rstn_gpio,
GPIOF_OUT_INIT_LOW, "tlv320aic32x4 rstn");