ASoC: wm8960: Add device tree support

Document the device tree binding for the WM8960 codec, and modify the
driver to extract the platform data from device tree, if present.

Signed-off-by: Zidan Wang <b50113@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/wm8960.txt b/Documentation/devicetree/bindings/sound/wm8960.txt
new file mode 100644 (file)
index 0000000..2deb8a3
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/wm8960.txt
@@ -0,0 +1,31 @@
+WM8960 audio CODEC
+
+This device supports I2C only.
+
+Required properties:
+
+  - compatible : "wlf,wm8960"
+
+  - reg : the I2C address of the device.
+
+Optional properties:
+  - wlf,shared-lrclk: This is a boolean property. If present, the LRCM bit of
+       R24 (Additional control 2) gets set, indicating that ADCLRC and DACLRC pins
+       will be disabled only when ADC (Left and Right) and DAC (Left and Right)
+       are disabled.
+       When wm8960 works on synchronize mode and DACLRC pin is used to supply
+       frame clock, it will no frame clock for captrue unless enable DAC to enable
+       DACLRC pin. If shared-lrclk is present, no need to enable DAC for captrue.
+
+  - wlf,capless: This is a boolean property. If present, OUT3 pin will be
+       enabled and disabled together with HP_L and HP_R pins in response to jack
+       detect events.
+
+Example:
+
+codec: wm8960@1a {
+       compatible = "wlf,wm8960";
+       reg = <0x1a>;
+
+       wlf,shared-lrclk;
+};

diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
index 4dc4e85..99d6457 100644 (file)
--- a/sound/soc/codecs/wm8960.c
+++ b/sound/soc/codecs/wm8960.c
@@ -125,6 +125,7 @@ struct wm8960_priv {
        struct snd_soc_dapm_widget *out3;
        bool deemph;
        int playback_fs;
+       struct wm8960_data pdata;
 };
 
 #define wm8960_reset(c)        snd_soc_write(c, WM8960_RESET, 0)
@@ -440,8 +441,8 @@ static const struct snd_soc_dapm_route audio_paths_capless[] = {
 
 static int wm8960_add_widgets(struct snd_soc_codec *codec)
 {
-       struct wm8960_data *pdata = codec->dev->platform_data;
        struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
+       struct wm8960_data *pdata = &wm8960->pdata;
        struct snd_soc_dapm_context *dapm = &codec->dapm;
        struct snd_soc_dapm_widget *w;
 
@@ -961,17 +962,13 @@ static int wm8960_resume(struct snd_soc_codec *codec)
 static int wm8960_probe(struct snd_soc_codec *codec)
 {
        struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
-       struct wm8960_data *pdata = dev_get_platdata(codec->dev);
+       struct wm8960_data *pdata = &wm8960->pdata;
        int ret;
 
-       wm8960->set_bias_level = wm8960_set_bias_level_out3;
-
-       if (!pdata) {
-               dev_warn(codec->dev, "No platform data supplied\n");
-       } else {
-               if (pdata->capless)
-                       wm8960->set_bias_level = wm8960_set_bias_level_capless;
-       }
+       if (pdata->capless)
+               wm8960->set_bias_level = wm8960_set_bias_level_capless;
+       else
+               wm8960->set_bias_level = wm8960_set_bias_level_out3;
 
        ret = wm8960_reset(codec);
        if (ret < 0) {
@@ -1029,6 +1026,18 @@ static const struct regmap_config wm8960_regmap = {
        .volatile_reg = wm8960_volatile,
 };
 
+static void wm8960_set_pdata_from_of(struct i2c_client *i2c,
+                               struct wm8960_data *pdata)
+{
+       const struct device_node *np = i2c->dev.of_node;
+
+       if (of_property_read_bool(np, "wlf,capless"))
+               pdata->capless = true;
+
+       if (of_property_read_bool(np, "wlf,shared-lrclk"))
+               pdata->shared_lrclk = true;
+}
+
 static int wm8960_i2c_probe(struct i2c_client *i2c,
                            const struct i2c_device_id *id)
 {
@@ -1045,6 +1054,11 @@ static int wm8960_i2c_probe(struct i2c_client *i2c,
        if (IS_ERR(wm8960->regmap))
                return PTR_ERR(wm8960->regmap);
 
+       if (pdata)
+               memcpy(&wm8960->pdata, pdata, sizeof(struct wm8960_data));
+       else if (i2c->dev.of_node)
+               wm8960_set_pdata_from_of(i2c, &wm8960->pdata);
+
        if (pdata && pdata->shared_lrclk) {
                ret = regmap_update_bits(wm8960->regmap, WM8960_ADDCTL2,
                                         0x4, 0x4);
@@ -1075,10 +1089,17 @@ static const struct i2c_device_id wm8960_i2c_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, wm8960_i2c_id);
 
+static const struct of_device_id wm8960_of_match[] = {
+       { .compatible = "wlf,wm8960", },
+       { }
+};
+MODULE_DEVICE_TABLE(of, wm8960_of_match);
+
 static struct i2c_driver wm8960_i2c_driver = {
        .driver = {
                .name = "wm8960",
                .owner = THIS_MODULE,
+               .of_match_table = wm8960_of_match,
        },
        .probe =    wm8960_i2c_probe,
        .remove =   wm8960_i2c_remove,