ASoC: maxim,max9867: add "mclk" support

Add basic support for the codecs' mclk.
Enable it on SND_SOC_BIAS_ON, disable it on SND_SOC_BIAS_OFF.

Signed-off-by: Benjamin Bara <benjamin.bara@skidata.com>
Signed-off-by: Richard Leitner <richard.leitner@skidata.com>
Link: https://lore.kernel.org/r/20230302-max9867-v2-3-fd2036d5e825@skidata.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/max9867.c b/sound/soc/codecs/max9867.c
index e161ab0..ae552d7 100644 (file)
--- a/sound/soc/codecs/max9867.c
+++ b/sound/soc/codecs/max9867.c
@@ -6,6 +6,7 @@
 // Copyright 2018 Ladislav Michl <ladis@linux-mips.org>
 //
 
+#include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
@@ -16,6 +17,7 @@
 #include "max9867.h"
 
 struct max9867_priv {
+       struct clk *mclk;
        struct regmap *regmap;
        const struct snd_pcm_hw_constraint_list *constraints;
        unsigned int sysclk, pclk;
@@ -577,6 +579,11 @@ static int max9867_set_bias_level(struct snd_soc_component *component,
        struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
 
        switch (level) {
+       case SND_SOC_BIAS_ON:
+               err = clk_prepare_enable(max9867->mclk);
+               if (err)
+                       return err;
+               break;
        case SND_SOC_BIAS_STANDBY:
                if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {
                        err = regcache_sync(max9867->regmap);
@@ -595,6 +602,7 @@ static int max9867_set_bias_level(struct snd_soc_component *component,
                        return err;
 
                regcache_mark_dirty(max9867->regmap);
+               clk_disable_unprepare(max9867->mclk);
                break;
        default:
                break;
@@ -663,9 +671,16 @@ static int max9867_i2c_probe(struct i2c_client *i2c)
        dev_info(&i2c->dev, "device revision: %x\n", reg);
        ret = devm_snd_soc_register_component(&i2c->dev, &max9867_component,
                        max9867_dai, ARRAY_SIZE(max9867_dai));
-       if (ret < 0)
+       if (ret < 0) {
                dev_err(&i2c->dev, "Failed to register component: %d\n", ret);
-       return ret;
+               return ret;
+       }
+
+       max9867->mclk = devm_clk_get(&i2c->dev, NULL);
+       if (IS_ERR(max9867->mclk))
+               return PTR_ERR(max9867->mclk);
+
+       return 0;
 }
 
 static const struct i2c_device_id max9867_i2c_id[] = {