linux-kernel - [PATCH 2/5] iio: adc: ad7266: use devm_regulator_get_enable_read

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Message-ID: <20240531-iio-adc-ref-supply-refactor-v1-2-4b313c0615ad@baylibre.com>
Date: Fri, 31 May 2024 16:19:33 -0500
From: David Lechner <dlechner@...libre.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: David Lechner <dlechner@...libre.com>,
	Marcelo Schmitt <marcelo.schmitt1@...il.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] iio: adc: ad7266: use devm_regulator_get_enable_read_voltage

This makes use of the new devm_regulator_get_enable_read_voltage()
function to reduce boilerplate code.

Signed-off-by: David Lechner <dlechner@...libre.com>
---
 drivers/iio/adc/ad7266.c | 37 ++++++++++---------------------------
 1 file changed, 10 insertions(+), 27 deletions(-)

diff --git a/drivers/iio/adc/ad7266.c b/drivers/iio/adc/ad7266.c
index 353a97f9c086..026db1bedc0a 100644
--- a/drivers/iio/adc/ad7266.c
+++ b/drivers/iio/adc/ad7266.c
@@ -25,7 +25,6 @@
 
 struct ad7266_state {
 	struct spi_device	*spi;
-	struct regulator	*reg;
 	unsigned long		vref_mv;
 
 	struct spi_transfer	single_xfer[3];
@@ -377,11 +376,6 @@ static const char * const ad7266_gpio_labels[] = {
 	"ad0", "ad1", "ad2",
 };
 
-static void ad7266_reg_disable(void *reg)
-{
-	regulator_disable(reg);
-}
-
 static int ad7266_probe(struct spi_device *spi)
 {
 	struct ad7266_platform_data *pdata = spi->dev.platform_data;
@@ -396,28 +390,17 @@ static int ad7266_probe(struct spi_device *spi)
 
 	st = iio_priv(indio_dev);
 
-	st->reg = devm_regulator_get_optional(&spi->dev, "vref");
-	if (!IS_ERR(st->reg)) {
-		ret = regulator_enable(st->reg);
-		if (ret)
-			return ret;
-
-		ret = devm_add_action_or_reset(&spi->dev, ad7266_reg_disable, st->reg);
-		if (ret)
-			return ret;
-
-		ret = regulator_get_voltage(st->reg);
-		if (ret < 0)
-			return ret;
-
-		st->vref_mv = ret / 1000;
-	} else {
-		/* Any other error indicates that the regulator does exist */
-		if (PTR_ERR(st->reg) != -ENODEV)
-			return PTR_ERR(st->reg);
-		/* Use internal reference */
+	/*
+	 * Use external reference from vref if present, otherwise use 2.5V
+	 * internal reference.
+	 */
+	ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vref");
+	if (ret == -ENODEV)
 		st->vref_mv = 2500;
-	}
+	else if (ret < 0)
+		return ret;
+	else
+		st->vref_mv = ret / 1000;
 
 	if (pdata) {
 		st->fixed_addr = pdata->fixed_addr;

-- 
2.45.1