[PATCH 3/7] ASoC: cs42l51: add reset management

[Olivier Moysan]

Manage cs42l51 audio codec reset pin.

Signed-off-by: Olivier Moysan <olivier.moy...@st.com>
---
 sound/soc/codecs/cs42l51.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/sound/soc/codecs/cs42l51.c b/sound/soc/codecs/cs42l51.c
index f43eb51d2d8d..9b3ffa16b204 100644
--- a/sound/soc/codecs/cs42l51.c
+++ b/sound/soc/codecs/cs42l51.c
@@ -30,6 +30,7 @@
 #include <sound/initval.h>
 #include <sound/pcm_params.h>
 #include <sound/pcm.h>
+#include <linux/gpio/consumer.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 
@@ -54,6 +55,7 @@ struct cs42l51_private {
        unsigned int audio_mode;        /* The mode (I2S or left-justified) */
        enum master_slave_mode func;
        struct regulator_bulk_data supplies[ARRAY_SIZE(cs42l51_supply_names)];
+       struct gpio_desc *reset_gpio;
 };
 
 #define CS42L51_FORMATS ( \
@@ -595,6 +597,17 @@ int cs42l51_probe(struct device *dev, struct regmap 
*regmap)
                return ret;
        }
 
+       cs42l51->reset_gpio = devm_gpiod_get_optional(dev, "reset",
+                                                     GPIOD_OUT_LOW);
+       if (IS_ERR(cs42l51->reset_gpio))
+               return PTR_ERR(cs42l51->reset_gpio);
+
+       if (cs42l51->reset_gpio) {
+               dev_dbg(dev, "Release reset gpio\n");
+               gpiod_set_value_cansleep(cs42l51->reset_gpio, 0);
+               mdelay(2);
+       }
+
        /* Verify that we have a CS42L51 */
        ret = regmap_read(regmap, CS42L51_CHIP_REV_ID, &val);
        if (ret < 0) {
@@ -629,6 +642,8 @@ int cs42l51_remove(struct device *dev)
 {
        struct cs42l51_private *cs42l51 = dev_get_drvdata(dev);
 
+       gpiod_set_value_cansleep(cs42l51->reset_gpio, 1);
+
        return regulator_bulk_disable(ARRAY_SIZE(cs42l51->supplies),
                                      cs42l51->supplies);
 }
-- 
2.7.4