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

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Date:   Tue, 27 Feb 2018 22:24:32 +0100
From:   Mylène Josserand <mylene.josserand@...tlin.com>
To:     lgirdwood@...il.com, broonie@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, perex@...ex.cz, tiwai@...e.com
Cc:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, mylene.josserand@...tlin.com,
        alexandre.belloni@...tlin.com, thomas.petazzoni@...tlin.com
Subject: [PATCH v1 3/4] ASoC: codecs: pcm179x: Add reset gpio

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

Signed-off-by: Mylène Josserand <mylene.josserand@...tlin.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