linux-kernel - [PATCH 1/2] ASoC: max98927: Handle reset gpio when probing i2c

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Message-Id: <20210829154545.383119-2-atafalla@dnyon.com>
Date:   Sun, 29 Aug 2021 17:45:43 +0200
From:   Alejandro Tafalla <atafalla@...on.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Alejandro Tafalla <atafalla@...on.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] ASoC: max98927: Handle reset gpio when probing i2c

Drive the reset gpio if defined in the DTS node.

Signed-off-by: Alejandro Tafalla <atafalla@...on.com>
---
 sound/soc/codecs/max98927.c | 16 ++++++++++++++++
 sound/soc/codecs/max98927.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/sound/soc/codecs/max98927.c b/sound/soc/codecs/max98927.c
index 8b206ee77709..dacf64c4cdf7 100644
--- a/sound/soc/codecs/max98927.c
+++ b/sound/soc/codecs/max98927.c
@@ -898,6 +898,22 @@ static int max98927_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
+	max98927->reset_gpio
+		= devm_gpiod_get_optional(&i2c->dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(max98927->reset_gpio)) {
+		ret = PTR_ERR(max98927->reset_gpio);
+		dev_err(&i2c->dev,
+			"Failed to request GPIO reset pin, error %d\n", ret);
+		return ret;
+	}
+
+	if (max98927->reset_gpio) {
+		gpiod_set_value_cansleep(max98927->reset_gpio, 0);
+		usleep_range(5, 10)
+		gpiod_set_value_cansleep(max98927->reset_gpio, 1);
+		usleep_range(1, 5)
+	}
+
 	/* Check Revision ID */
 	ret = regmap_read(max98927->regmap,
 		MAX98927_R01FF_REV_ID, &reg);
diff --git a/sound/soc/codecs/max98927.h b/sound/soc/codecs/max98927.h
index 05f495db914d..5c04bf38e24a 100644
--- a/sound/soc/codecs/max98927.h
+++ b/sound/soc/codecs/max98927.h
@@ -255,6 +255,7 @@ struct max98927_priv {
 	struct regmap *regmap;
 	struct snd_soc_component *component;
 	struct max98927_pdata *pdata;
+	struct gpio_desc *reset_gpio;
 	unsigned int spk_gain;
 	unsigned int sysclk;
 	unsigned int v_l_slot;
-- 
2.32.0