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From: David Lechner <dlechner@baylibre.com>
To: Jonathan Cameron <jic23@kernel.org>
Cc: David Lechner <dlechner@baylibre.com>,
	Marcelo Schmitt <marcelo.schmitt1@gmail.com>,
	=?utf-8?q?Nuno_S=C3=A1?= <nuno.sa@analog.com>,
	Michael Hennerich <Michael.Hennerich@analog.com>,
	Mark Brown <broonie@kernel.org>,
	Liam Girdwood <lgirdwood@gmail.com>,
	linux-iio@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v2 2/5] iio: adc: ad7266: use devm_regulator_get_enable_read_voltage
Date: Wed, 12 Jun 2024 16:03:06 -0500
Message-ID: <20240612-iio-adc-ref-supply-refactor-v2-2-fa622e7354e9@baylibre.com>
In-Reply-To: <20240612-iio-adc-ref-supply-refactor-v2-0-fa622e7354e9@baylibre.com>
References: <20240612-iio-adc-ref-supply-refactor-v2-0-fa622e7354e9@baylibre.com>
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This makes use of the new devm_regulator_get_enable_read_voltage()
function to reduce boilerplate code.

Signed-off-by: David Lechner <dlechner@baylibre.com>
---

v2 changes:
- avoid else in return value check
- use macro instead of comment to explain internal reference voltage
---
 drivers/iio/adc/ad7266.c | 33 ++++++---------------------------
 1 file changed, 6 insertions(+), 27 deletions(-)

diff --git a/drivers/iio/adc/ad7266.c b/drivers/iio/adc/ad7266.c
index 353a97f9c086..874d2dc34f92 100644
--- a/drivers/iio/adc/ad7266.c
+++ b/drivers/iio/adc/ad7266.c
@@ -23,9 +23,10 @@
 
 #include <linux/platform_data/ad7266.h>
 
+#define AD7266_INTERNAL_REF_MV	2500
+
 struct ad7266_state {
 	struct spi_device	*spi;
-	struct regulator	*reg;
 	unsigned long		vref_mv;
 
 	struct spi_transfer	single_xfer[3];
@@ -377,11 +378,6 @@ 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 +392,11 @@ 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;
+	ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vref");
+	if (ret < 0 && ret != -ENODEV)
+		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 */
-		st->vref_mv = 2500;
-	}
+	st->vref_mv = ret == -ENODEV ? AD7266_INTERNAL_REF_MV : ret / 1000;
 
 	if (pdata) {
 		st->fixed_addr = pdata->fixed_addr;

-- 
2.45.2