diff options
| author | Codrin Ciubotariu <codrin.ciubotariu@microchip.com> | 2019-02-18 17:10:36 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-02-18 18:41:42 +0100 |
| commit | 59529473751e987e28c926838f70aaef588b83b0 (patch) | |
| tree | 7dde0b2b40e575688c9354be552c35d6a463357e /sound | |
| parent | ASoC: codecs: ad193x: Add runtime support for DSP_A and I2S modes (diff) | |
| download | linux-59529473751e987e28c926838f70aaef588b83b0.tar.xz linux-59529473751e987e28c926838f70aaef588b83b0.zip | |
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>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/codecs/ad193x.c | 26 | ||||
| -rw-r--r-- | sound/soc/codecs/ad193x.h | 8 |
2 files changed, 33 insertions, 1 deletions
diff --git a/sound/soc/codecs/ad193x.c b/sound/soc/codecs/ad193x.c index f8cf182518a3..96d7cb2e4a56 100644 --- a/sound/soc/codecs/ad193x.c +++ b/sound/soc/codecs/ad193x.c @@ -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: diff --git a/sound/soc/codecs/ad193x.h b/sound/soc/codecs/ad193x.h index 8b1e65f928d2..27d6afbd7dfb 100644 --- a/sound/soc/codecs/ad193x.h +++ b/sound/soc/codecs/ad193x.h @@ -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 |