ASoC: wm8731: let codec to manage clock by itself

Enable WM8731 to support common clock framework.

Signed-off-by: Songjun Wu <songjun.wu@atmel.com>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8731.c b/sound/soc/codecs/wm8731.c
index 098c143f44d6..8df1550f74b5 100644
--- a/sound/soc/codecs/wm8731.c
+++ b/sound/soc/codecs/wm8731.c
@@ -25,6 +25,7 @@
 #include <linux/spi/spi.h>
 #include <linux/of_device.h>
 #include <linux/mutex.h>
+#include <linux/clk.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -45,6 +46,7 @@ static const char *wm8731_supply_names[WM8731_NUM_SUPPLIES] = {
 /* codec private data */
 struct wm8731_priv {
         struct regmap *regmap;
+        struct clk *mclk;
         struct regulator_bulk_data supplies[WM8731_NUM_SUPPLIES];
         const struct snd_pcm_hw_constraint_list *constraints;
         unsigned int sysclk;
@@ -390,6 +392,8 @@ static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
         switch (clk_id) {
         case WM8731_SYSCLK_XTAL:
         case WM8731_SYSCLK_MCLK:
+                if (wm8731->mclk && clk_set_rate(wm8731->mclk, freq))
+                        return -EINVAL;
                 wm8731->sysclk_type = clk_id;
                 break;
         default:
@@ -491,6 +495,8 @@ static int wm8731_set_bias_level(struct snd_soc_codec *codec,
 
         switch (level) {
         case SND_SOC_BIAS_ON:
+                if (wm8731->mclk)
+                        clk_prepare_enable(wm8731->mclk);
                 break;
         case SND_SOC_BIAS_PREPARE:
                 break;
@@ -509,6 +515,8 @@ static int wm8731_set_bias_level(struct snd_soc_codec *codec,
                 snd_soc_write(codec, WM8731_PWR, reg | 0x0040);
                 break;
         case SND_SOC_BIAS_OFF:
+                if (wm8731->mclk)
+                        clk_disable_unprepare(wm8731->mclk);
                 snd_soc_write(codec, WM8731_PWR, 0xffff);
                 regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies),
                                        wm8731->supplies);
@@ -667,6 +675,19 @@ static int wm8731_spi_probe(struct spi_device *spi)
         if (wm8731 == NULL)
                 return -ENOMEM;
 
+        wm8731->mclk = devm_clk_get(&spi->dev, "mclk");
+        if (IS_ERR(wm8731->mclk)) {
+                ret = PTR_ERR(wm8731->mclk);
+                if (ret == -ENOENT) {
+                        wm8731->mclk = NULL;
+                        dev_warn(&spi->dev, "Assuming static MCLK\n");
+                } else {
+                        dev_err(&spi->dev, "Failed to get MCLK: %d\n",
+                                ret);
+                        return ret;
+                }
+        }
+
         mutex_init(&wm8731->lock);
 
         wm8731->regmap = devm_regmap_init_spi(spi, &wm8731_regmap);
@@ -718,6 +739,19 @@ static int wm8731_i2c_probe(struct i2c_client *i2c,
         if (wm8731 == NULL)
                 return -ENOMEM;
 
+        wm8731->mclk = devm_clk_get(&i2c->dev, "mclk");
+        if (IS_ERR(wm8731->mclk)) {
+                ret = PTR_ERR(wm8731->mclk);
+                if (ret == -ENOENT) {
+                        wm8731->mclk = NULL;
+                        dev_warn(&i2c->dev, "Assuming static MCLK\n");
+                } else {
+                        dev_err(&i2c->dev, "Failed to get MCLK: %d\n",
+                                ret);
+                        return ret;
+                }
+        }
+
         mutex_init(&wm8731->lock);
 
         wm8731->regmap = devm_regmap_init_i2c(i2c, &wm8731_regmap);