MFD: twl4030-codec: APLL_INFREQ handling in the MFD driver

Configure the APLL_INFREQ field in the APLL_CTL register
based on the platform data.
Provide also a function for childs to query the audio_mclk
frequency.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 36 insertions, 0 deletions

diff --git a/drivers/mfd/twl4030-codec.c b/drivers/mfd/twl4030-codec.c
index 97103078dc2a..77b914907d7c 100644
--- a/drivers/mfd/twl4030-codec.c
+++ b/drivers/mfd/twl4030-codec.c
@@ -41,6 +41,7 @@ struct twl4030_codec_resource {
 };
 
 struct twl4030_codec {
+        unsigned int audio_mclk;
         struct mutex mutex;
         struct twl4030_codec_resource resource[TWL4030_CODEC_RES_MAX];
         struct mfd_cell cells[TWL4030_CODEC_CELLS];
@@ -145,12 +146,45 @@ int twl4030_codec_disable_resource(unsigned id)
 }
 EXPORT_SYMBOL_GPL(twl4030_codec_disable_resource);
 
+unsigned int twl4030_codec_get_mclk(void)
+{
+        struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
+
+        return codec->audio_mclk;
+}
+EXPORT_SYMBOL_GPL(twl4030_codec_get_mclk);
+
 static int __devinit twl4030_codec_probe(struct platform_device *pdev)
 {
         struct twl4030_codec *codec;
         struct twl4030_codec_data *pdata = pdev->dev.platform_data;
         struct mfd_cell *cell = NULL;
         int ret, childs = 0;
+        u8 val;
+
+        if (!pdata) {
+                dev_err(&pdev->dev, "Platform data is missing\n");
+                return -EINVAL;
+        }
+
+        /* Configure APLL_INFREQ and disable APLL if enabled */
+        val = 0;
+        switch (pdata->audio_mclk) {
+        case 19200000:
+                val |= TWL4030_APLL_INFREQ_19200KHZ;
+                break;
+        case 26000000:
+                val |= TWL4030_APLL_INFREQ_26000KHZ;
+                break;
+        case 38400000:
+                val |= TWL4030_APLL_INFREQ_38400KHZ;
+                break;
+        default:
+                dev_err(&pdev->dev, "Invalid audio_mclk\n");
+                return -EINVAL;
+        }
+        twl4030_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
+                                        val, TWL4030_REG_APLL_CTL);
 
         codec = kzalloc(sizeof(struct twl4030_codec), GFP_KERNEL);
         if (!codec)
@@ -160,6 +194,7 @@ static int __devinit twl4030_codec_probe(struct platform_device *pdev)
 
         twl4030_codec_dev = pdev;
         mutex_init(&codec->mutex);
+        codec->audio_mclk = pdata->audio_mclk;
 
         /* Codec power */
         codec->resource[TWL4030_CODEC_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
diff --git a/include/linux/mfd/twl4030-codec.h b/include/linux/mfd/twl4030-codec.h
index ef0a3041d759..2ec317c68e59 100644
--- a/include/linux/mfd/twl4030-codec.h
+++ b/include/linux/mfd/twl4030-codec.h
@@ -267,5 +267,6 @@ enum twl4030_codec_res {
 
 int twl4030_codec_disable_resource(enum twl4030_codec_res id);
 int twl4030_codec_enable_resource(enum twl4030_codec_res id);
+unsigned int twl4030_codec_get_mclk(void);
 
 #endif  /* End of __TWL4030_CODEC_H__ */