ASoC: codecs: adau1701: add DT bindings

Apart from pure matching, the bindings also support setting the the
reset gpio line.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/Documentation/devicetree/bindings/sound/adi,adau1701.txt b/Documentation/devicetree/bindings/sound/adi,adau1701.txt
new file mode 100644 (file)
index 0000000..3afeda7
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/adi,adau1701.txt
@@ -0,0 +1,23 @@
+Analog Devices ADAU1701
+
+Required properties:
+
+ - compatible:         Should contain "adi,adau1701"
+ - reg:                        The i2c address. Value depends on the state of ADDR0
+                       and ADDR1, as wired in hardware.
+
+Optional properties:
+
+ - reset-gpio:                 A GPIO spec to define which pin is connected to the
+                       chip's !RESET pin. If specified, the driver will
+                       assert a hardware reset at probe time.
+
+Examples:
+
+       i2c_bus {
+               adau1701@34 {
+                       compatible = "adi,adau1701";
+                       reg = <0x34>;
+                       reset-gpio = <&gpio 23 0>;
+               };
+       };

diff --git a/sound/soc/codecs/adau1701.c b/sound/soc/codecs/adau1701.c
index 95e1677..3fc1763 100644 (file)
--- a/sound/soc/codecs/adau1701.c
+++ b/sound/soc/codecs/adau1701.c
@@ -13,6 +13,9 @@
 #include <linux/i2c.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_device.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -452,6 +455,14 @@ static struct snd_soc_dai_driver adau1701_dai = {
        .symmetric_rates = 1,
 };
 
+#ifdef CONFIG_OF
+static const struct of_device_id adau1701_dt_ids[] = {
+       { .compatible = "adi,adau1701", },
+       { }
+};
+MODULE_DEVICE_TABLE(of, adau1701_dt_ids);
+#endif
+
 static int adau1701_probe(struct snd_soc_codec *codec)
 {
        int ret;
@@ -494,12 +505,33 @@ static int adau1701_i2c_probe(struct i2c_client *client,
                              const struct i2c_device_id *id)
 {
        struct adau1701 *adau1701;
+       struct device *dev = &client->dev;
+       int gpio_nreset = -EINVAL;
        int ret;
 
-       adau1701 = devm_kzalloc(&client->dev, sizeof(*adau1701), GFP_KERNEL);
+       adau1701 = devm_kzalloc(dev, sizeof(*adau1701), GFP_KERNEL);
        if (!adau1701)
                return -ENOMEM;
 
+       if (dev->of_node) {
+               gpio_nreset = of_get_named_gpio(dev->of_node, "reset-gpio", 0);
+               if (gpio_nreset < 0 && gpio_nreset != -ENOENT)
+                       return gpio_nreset;
+       }
+
+       if (gpio_is_valid(gpio_nreset)) {
+               ret = devm_gpio_request_one(dev, gpio_nreset, GPIOF_OUT_INIT_LOW,
+                                           "ADAU1701 Reset");
+               if (ret < 0)
+                       return ret;
+
+               /* minimum reset time is 20ns */
+               udelay(1);
+               gpio_set_value(gpio_nreset, 1);
+               /* power-up time may be as long as 85ms */
+               mdelay(85);
+       }
+
        i2c_set_clientdata(client, adau1701);
        ret = snd_soc_register_codec(&client->dev, &adau1701_codec_drv,
                        &adau1701_dai, 1);
@@ -522,6 +554,7 @@ static struct i2c_driver adau1701_i2c_driver = {
        .driver = {
                .name   = "adau1701",
                .owner  = THIS_MODULE,
+               .of_match_table = of_match_ptr(adau1701_dt_ids),
        },
        .probe          = adau1701_i2c_probe,
        .remove         = adau1701_i2c_remove,