linux-kernel - [PATCH] ASoC: max98390: Add reset gpio control

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Date:   Thu, 10 Mar 2022 17:15:48 +0900
From:   Steve Lee <steve.lee.analog@...il.com>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, ckeepax@...nsource.cirrus.com,
        geert@...ux-m68k.org, rf@...nsource.wolfsonmicro.com,
        shumingf@...ltek.com, srinivas.kandagatla@...aro.org,
        krzk@...nel.org, dmurphy@...com, jack.yu@...ltek.com,
        nuno.sa@...log.com, steves.lee@...imintegrated.com,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Cc:     Steve Lee <steve.lee.analog@...il.com>
Subject: [PATCH] ASoC: max98390: Add reset gpio control

 Add reset gpio control to support RESET PIN connected to gpio.

Signed-off-by: Steve Lee <steve.lee.analog@...il.com>
---
 sound/soc/codecs/max98390.c | 18 ++++++++++++++++++
 sound/soc/codecs/max98390.h |  1 +
 2 files changed, 19 insertions(+)

diff --git a/sound/soc/codecs/max98390.c b/sound/soc/codecs/max98390.c
index b392567c2b3e..574d8d5f1119 100644
--- a/sound/soc/codecs/max98390.c
+++ b/sound/soc/codecs/max98390.c
@@ -1073,6 +1073,24 @@ static int max98390_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
+	max98390->reset_gpio = of_get_named_gpio(i2c->dev.of_node,
+						"maxim,reset-gpios", 0);
+
+	/* Power on device */
+	if (gpio_is_valid(max98390->reset_gpio)) {
+		ret = devm_gpio_request(&i2c->dev, max98390->reset_gpio,
+					"MAX98390_RESET");
+		if (ret) {
+			dev_err(&i2c->dev, "%s: Failed to request gpio %d\n",
+				__func__, max98390->reset_gpio);
+			return -EINVAL;
+		}
+		gpio_direction_output(max98390->reset_gpio, 0);
+		usleep_range(1000, 2000);
+		gpio_direction_output(max98390->reset_gpio, 1);
+		usleep_range(1000, 2000);
+	}
+
 	/* Check Revision ID */
 	ret = regmap_read(max98390->regmap,
 		MAX98390_R24FF_REV_ID, &reg);
diff --git a/sound/soc/codecs/max98390.h b/sound/soc/codecs/max98390.h
index c250740f73a2..5518f2340247 100644
--- a/sound/soc/codecs/max98390.h
+++ b/sound/soc/codecs/max98390.h
@@ -655,6 +655,7 @@
 
 struct max98390_priv {
 	struct regmap *regmap;
+	int reset_gpio;
 	unsigned int sysclk;
 	unsigned int master;
 	unsigned int tdm_mode;
-- 
2.17.1