ASoC: Add reset-gpio DT property to cs4270 driver

[deliverable/linux.git] / sound / soc / codecs / cs4270.c

diff --git a/sound/soc/codecs/cs4270.c b/sound/soc/codecs/cs4270.c
index 4b71b01ecbcd7f012b77145db3ba841c6d369225..fd11bb646d40447c07cb7b9f7d3f79ccbf956aad 100644 (file)
--- a/sound/soc/codecs/cs4270.c
+++ b/sound/soc/codecs/cs4270.c
@@ -30,6 +30,7 @@
 #include <linux/delay.h>
 #include <linux/regulator/consumer.h>
 #include <linux/of_device.h>
+#include <linux/of_gpio.h>
 
 /*
  * The codec isn't really big-endian or little-endian, since the I2S
@@ -660,9 +661,25 @@ MODULE_DEVICE_TABLE(of, cs4270_of_match);
 static int cs4270_i2c_probe(struct i2c_client *i2c_client,
        const struct i2c_device_id *id)
 {
+       struct device_node *np = i2c_client->dev.of_node;
        struct cs4270_private *cs4270;
        int ret;
 
+       /* See if we have a way to bring the codec out of reset */
+       if (np) {
+               enum of_gpio_flags flags;
+               int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
+
+               if (gpio_is_valid(gpio)) {
+                       ret = devm_gpio_request_one(&i2c_client->dev, gpio,
+                                    flags & OF_GPIO_ACTIVE_LOW ?
+                                       GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
+                                    "cs4270 reset");
+                       if (ret < 0)
+                               return ret;
+               }
+       }
+
        /* Verify that we have a CS4270 */
 
        ret = i2c_smbus_read_byte_data(i2c_client, CS4270_CHIPID);