[PATCH v1 3/4] ASoC: codecs: pcm179x: Add reset gpio

[Mylène Josserand]

Add a reset gpio to be able to reset this line at startup.

Signed-off-by: Mylène Josserand <mylene.josser...@bootlin.com>
---
 sound/soc/codecs/pcm179x.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/sound/soc/codecs/pcm179x.c b/sound/soc/codecs/pcm179x.c
index 2285a51ff9e9..0242dfd67b53 100644
--- a/sound/soc/codecs/pcm179x.c
+++ b/sound/soc/codecs/pcm179x.c
@@ -22,6 +22,8 @@
 #include <linux/device.h>
 
 #include <sound/core.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/initval.h>
@@ -106,6 +108,7 @@ struct pcm179x_private {
        struct regmap *regmap;
        unsigned int format;
        unsigned int rate;
+       int reset;
 };
 
 static int pcm179x_set_dai_fmt(struct snd_soc_dai *codec_dai,
@@ -381,6 +384,8 @@ int pcm179x_common_init(struct device *dev, struct regmap 
*regmap,
                        enum pcm17xx_type type)
 {
        struct pcm179x_private *pcm179x;
+       struct device_node *np = dev->of_node;
+       int ret;
 
        pcm179x = devm_kzalloc(dev, sizeof(struct pcm179x_private),
                                GFP_KERNEL);
@@ -390,6 +395,21 @@ int pcm179x_common_init(struct device *dev, struct regmap 
*regmap,
        pcm179x->regmap = regmap;
        dev_set_drvdata(dev, pcm179x);
 
+       pcm179x->reset = of_get_named_gpio(np, "reset-gpios", 0);
+       if (gpio_is_valid(pcm179x->reset)) {
+               ret = devm_gpio_request_one(dev, pcm179x->reset,
+                                           GPIOF_OUT_INIT_LOW,
+                                           "pcm179x reset");
+               if (ret) {
+                       dev_err(dev,
+                               "Failed to request GPIO %d as reset pin, error 
%d\n",
+                               pcm179x->reset, ret);
+                       return ret;
+               }
+
+               gpio_set_value(pcm179x->reset, 1);
+       }
+
        if (type == PCM1789)
                return devm_snd_soc_register_component(dev,
                                                       
&soc_component_dev_pcm1789,
-- 
2.11.0