[PATCH] ASoC: max98383: fix i2c probe failure

[chunguo feng]

From: fengchunguo <chunguo.f...@amlogic.com>

Added reset_gpio configuration for i2c probe successfully.
If not,i2c address can't be found rightly.

Error information:
max98373 3-0031: Failed to read: 0x21FF

Fixed:
[3.761299@3] max98373 3-0031: MAX98373 revisionID: 0x43
[3.828911@3] asoc-aml-card auge_sound: max98373-aif1 <-> TDM-B mapping ok

Signed-off-by: fengchunguo <chunguo.f...@amlogic.com>
---
 sound/soc/codecs/max98373.c | 34 ++++++++++++++++++++++++++++++----
 sound/soc/codecs/max98373.h |  1 +
 2 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/sound/soc/codecs/max98373.c b/sound/soc/codecs/max98373.c
index 528695cd6a1c..9a1eb7222357 100644
--- a/sound/soc/codecs/max98373.c
+++ b/sound/soc/codecs/max98373.c
@@ -12,6 +12,7 @@
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <linux/gpio.h>
+#include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <sound/tlv.h>
 #include "max98373.h"
@@ -895,6 +896,17 @@ static void max98373_slot_config(struct i2c_client *i2c,
        else
                max98373->i_slot = 1;
 
+       max98373->reset_gpio = of_get_named_gpio(dev->of_node,
+                                               "maxim,reset-gpio", 0);
+       if (!gpio_is_valid(max98373->reset_gpio)) {
+               dev_err(dev, "Looking up %s property in node %s failed %d\n",
+                       "maxim,reset-gpio", dev->of_node->full_name,
+                       max98373->reset_gpio);
+       } else {
+               dev_dbg(dev, "maxim,reset-gpio=%d",
+                       max98373->reset_gpio);
+       }
+
        if (!device_property_read_u32(dev, "maxim,spkfb-slot-no", &value))
                max98373->spkfb_slot = value & 0xF;
        else
@@ -923,7 +935,6 @@ static int max98373_i2c_probe(struct i2c_client *i2c,
        else
                max98373->interleave_mode = false;
 
-
        /* regmap initialization */
        max98373->regmap
                = devm_regmap_init_i2c(i2c, &max98373_regmap);
@@ -934,6 +945,24 @@ static int max98373_i2c_probe(struct i2c_client *i2c,
                return ret;
        }
 
+       /* voltage/current slot & gpio configuration */
+       max98373_slot_config(i2c, max98373);
+
+       /* Power on device */
+       if (gpio_is_valid(max98373->reset_gpio)) {
+               ret = gpio_request(max98373->reset_gpio, "MAX98373_RESET");
+               if (ret) {
+                       dev_err(&i2c->dev, "%s: Failed to request gpio %d\n",
+                               __func__, max98373->reset_gpio);
+                       gpio_free(max98373->reset_gpio);
+                       return -EINVAL;
+               }
+               gpio_direction_output(max98373->reset_gpio, 0);
+               msleep(50);
+               gpio_direction_output(max98373->reset_gpio, 1);
+               msleep(20);
+       }
+
        /* Check Revision ID */
        ret = regmap_read(max98373->regmap,
                MAX98373_R21FF_REV_ID, &reg);
@@ -944,9 +973,6 @@ static int max98373_i2c_probe(struct i2c_client *i2c,
        }
        dev_info(&i2c->dev, "MAX98373 revisionID: 0x%02X\n", reg);
 
-       /* voltage/current slot configuration */
-       max98373_slot_config(i2c, max98373);
-
        /* codec registeration */
        ret = devm_snd_soc_register_component(&i2c->dev, 
&soc_codec_dev_max98373,
                max98373_dai, ARRAY_SIZE(max98373_dai));
diff --git a/sound/soc/codecs/max98373.h b/sound/soc/codecs/max98373.h
index f6a37aa02f26..533d2053f608 100644
--- a/sound/soc/codecs/max98373.h
+++ b/sound/soc/codecs/max98373.h
@@ -203,6 +203,7 @@
 
 struct max98373_priv {
        struct regmap *regmap;
+       int reset_gpio;
        unsigned int v_slot;
        unsigned int i_slot;
        unsigned int spkfb_slot;
-- 
2.18.0