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Subject[PATCH v3 2/4] ASoC: es8316: add clock control of MCLK
Date
This patch introduce clock property for MCLK master freq control.
Driver will set rate of MCLK master if set_sysclk is called and
changing sysclk by board driver.

Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>

---

Changes from v1:
- Output logs if clock error is found
- Disable and unprepare mclk when remove this driver
---
sound/soc/codecs/es8316.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)

diff --git a/sound/soc/codecs/es8316.c b/sound/soc/codecs/es8316.c
index 229808fa627c..ab41f2c056bd 100644
--- a/sound/soc/codecs/es8316.c
+++ b/sound/soc/codecs/es8316.c
@@ -9,6 +9,7 @@

#include <linux/module.h>
#include <linux/acpi.h>
+#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/mod_devicetable.h>
@@ -33,6 +34,7 @@ static const unsigned int supported_mclk_lrck_ratios[] = {

struct es8316_priv {
struct mutex lock;
+ struct clk *mclk;
struct regmap *regmap;
struct snd_soc_component *component;
struct snd_soc_jack *jack;
@@ -363,12 +365,19 @@ static int es8316_set_dai_sysclk(struct snd_soc_dai *codec_dai,
{
struct snd_soc_component *component = codec_dai->component;
struct es8316_priv *es8316 = snd_soc_component_get_drvdata(component);
+ int ret;

es8316->sysclk = freq;

if (freq == 0)
return 0;

+ if (es8316->mclk) {
+ ret = clk_set_rate(es8316->mclk, freq);
+ if (ret)
+ return ret;
+ }
+
return 0;
}

@@ -693,9 +702,26 @@ static int es8316_set_jack(struct snd_soc_component *component,
static int es8316_probe(struct snd_soc_component *component)
{
struct es8316_priv *es8316 = snd_soc_component_get_drvdata(component);
+ int ret;

es8316->component = component;

+ es8316->mclk = devm_clk_get(component->dev, "mclk");
+ if (PTR_ERR(es8316->mclk) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ if (IS_ERR(es8316->mclk)) {
+ dev_err(component->dev, "clock is invalid, ignored\n");
+ es8316->mclk = NULL;
+ }
+
+ if (es8316->mclk) {
+ ret = clk_prepare_enable(es8316->mclk);
+ if (ret) {
+ dev_err(component->dev, "unable to enable clock\n");
+ return ret;
+ }
+ }
+
/* Reset codec and enable current state machine */
snd_soc_component_write(component, ES8316_RESET, 0x3f);
usleep_range(5000, 5500);
@@ -718,8 +744,17 @@ static int es8316_probe(struct snd_soc_component *component)
return 0;
}

+static void es8316_remove(struct snd_soc_component *component)
+{
+ struct es8316_priv *es8316 = snd_soc_component_get_drvdata(component);
+
+ if (es8316->mclk)
+ clk_disable_unprepare(es8316->mclk);
+}
+
static const struct snd_soc_component_driver soc_component_dev_es8316 = {
.probe = es8316_probe,
+ .remove = es8316_remove,
.set_jack = es8316_set_jack,
.controls = es8316_snd_controls,
.num_controls = ARRAY_SIZE(es8316_snd_controls),
--
2.23.0.rc1
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