ASoC: cs42l52: Add platform data for reset gpio

This patch adds platform data support for a reset GPIO.
Also uses reset_gpio to toggle reset of the CODEC

Signed-off-by: Brian Austin <brian.austin@cirrus.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

2 files changed, 19 insertions, 4 deletions

diff --git a/include/sound/cs42l52.h b/include/sound/cs42l52.h
index 4c68955f7330..7c2be4a51894 100644
--- a/include/sound/cs42l52.h
+++ b/include/sound/cs42l52.h
@@ -31,6 +31,8 @@ struct cs42l52_platform_data {
         /* Charge Pump Freq. Check datasheet Pg73 */
         unsigned int chgfreq;
 
+        /* Reset GPIO */
+        unsigned int reset_gpio;
 };
 
 #endif /* __CS42L52_H */
diff --git a/sound/soc/codecs/cs42l52.c b/sound/soc/codecs/cs42l52.c
index be2ba1b6fe4a..8367f3c571eb 100644
--- a/sound/soc/codecs/cs42l52.c
+++ b/sound/soc/codecs/cs42l52.c
@@ -17,6 +17,7 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/delay.h>
+#include <linux/gpio.h>
 #include <linux/pm.h>
 #include <linux/i2c.h>
 #include <linux/input.h>
@@ -1205,6 +1206,7 @@ static int cs42l52_i2c_probe(struct i2c_client *i2c_client,
                              const struct i2c_device_id *id)
 {
         struct cs42l52_private *cs42l52;
+        struct cs42l52_platform_data *pdata = dev_get_platdata(&i2c_client->dev);
         int ret;
         unsigned int devid = 0;
         unsigned int reg;
@@ -1222,11 +1224,22 @@ static int cs42l52_i2c_probe(struct i2c_client *i2c_client,
                 return ret;
         }
 
-        i2c_set_clientdata(i2c_client, cs42l52);
+        if (pdata)
+                cs42l52->pdata = *pdata;
 
-        if (dev_get_platdata(&i2c_client->dev))
-                memcpy(&cs42l52->pdata, dev_get_platdata(&i2c_client->dev),
-                       sizeof(cs42l52->pdata));
+        if (cs42l52->pdata.reset_gpio) {
+                ret = gpio_request_one(cs42l52->pdata.reset_gpio,
+                                       GPIOF_OUT_INIT_HIGH, "CS42L52 /RST");
+                if (ret < 0) {
+                        dev_err(&i2c_client->dev, "Failed to request /RST %d: %d\n",
+                                cs42l52->pdata.reset_gpio, ret);
+                        return ret;
+                }
+                gpio_set_value_cansleep(cs42l52->pdata.reset_gpio, 0);
+                gpio_set_value_cansleep(cs42l52->pdata.reset_gpio, 1);
+        }
+
+        i2c_set_clientdata(i2c_client, cs42l52);
 
         ret = regmap_register_patch(cs42l52->regmap, cs42l52_threshold_patch,
                                     ARRAY_SIZE(cs42l52_threshold_patch));