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ASoC: codecs: ad193x: Add support to disable on-chip PLL 

The on-chip PLL can be disabled if on the MCLKI pin we have an external
clock at 512 x fs. This clock can be used as direct internal clock for
ADCs or DACs.
To support this, we add an extra clock id that can be configured
using the set_sysclk() callback.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Codrin Ciubotariu 2019-02-18 16:10:36 +00:00 committed by Mark Brown
parent bccf9c7e14
commit 5952947375
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 33 additions and 1 deletions
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26
sound/soc/codecs/ad193x.c
View File

@ -100,6 +100,15 @@ static const struct snd_soc_dapm_widget ad193x_adc_widgets[] = {
SND_SOC_DAPM_INPUT("ADC2IN"),
};
static int ad193x_check_pll(struct snd_soc_dapm_widget *source,
struct snd_soc_dapm_widget *sink)
{
struct snd_soc_component *component = snd_soc_dapm_to_component(source->dapm);
struct ad193x_priv *ad193x = snd_soc_component_get_drvdata(component);
return !!ad193x->sysclk;
}
static const struct snd_soc_dapm_route audio_paths[] = {
{ "DAC", NULL, "SYSCLK" },
{ "DAC Output", NULL, "DAC" },
@ -108,7 +117,7 @@ static const struct snd_soc_dapm_route audio_paths[] = {
{ "DAC2OUT", NULL, "DAC Output" },
{ "DAC3OUT", NULL, "DAC Output" },
{ "DAC4OUT", NULL, "DAC Output" },
{ "SYSCLK", NULL, "PLL_PWR" },
{ "SYSCLK", NULL, "PLL_PWR", &ad193x_check_pll },
};
static const struct snd_soc_dapm_route ad193x_adc_audio_paths[] = {
@ -276,7 +285,22 @@ static int ad193x_set_dai_sysclk(struct snd_soc_dai *codec_dai,
int clk_id, unsigned int freq, int dir)
{
struct snd_soc_component *component = codec_dai->component;
struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
struct ad193x_priv *ad193x = snd_soc_component_get_drvdata(component);
if (clk_id == AD193X_SYSCLK_MCLK) {
/* MCLK must be 512 x fs */
if (dir == SND_SOC_CLOCK_OUT || freq != 24576000)
return -EINVAL;
regmap_update_bits(ad193x->regmap, AD193X_PLL_CLK_CTRL1,
AD193X_PLL_SRC_MASK,
AD193X_PLL_DAC_SRC_MCLK |
AD193X_PLL_CLK_SRC_MCLK);
snd_soc_dapm_sync(dapm);
return 0;
}
switch (freq) {
case 12288000:
case 18432000:

8
sound/soc/codecs/ad193x.h
View File

@ -31,6 +31,11 @@ int ad193x_probe(struct device *dev, struct regmap *regmap,
#define AD193X_PLL_INPUT_512 (2 << 1)
#define AD193X_PLL_INPUT_768 (3 << 1)
#define AD193X_PLL_CLK_CTRL1 0x01
#define AD193X_PLL_SRC_MASK 0x03
#define AD193X_PLL_DAC_SRC_PLL 0
#define AD193X_PLL_DAC_SRC_MCLK 1
#define AD193X_PLL_CLK_SRC_PLL (0 << 1)
#define AD193X_PLL_CLK_SRC_MCLK (1 << 1)
#define AD193X_DAC_CTRL0 0x02
#define AD193X_DAC_POWERDOWN 0x01
#define AD193X_DAC_SERFMT_MASK 0xC0
@ -96,4 +101,7 @@ int ad193x_probe(struct device *dev, struct regmap *regmap,
#define AD193X_NUM_REGS 17
#define AD193X_SYSCLK_PLL 0
#define AD193X_SYSCLK_MCLK 1
#endif