linux-kernel - [PATCH v2 5/7] iio: frequency: admv1013: Use devm_regulator_get_enable_read

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Message-ID: <20240429-regulator-get-enable-get-votlage-v2-5-b1f11ab766c1@baylibre.com>
Date: Mon, 29 Apr 2024 18:40:13 -0500
From: David Lechner <dlechner@...libre.com>
To: Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jean Delvare <jdelvare@...e.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Jonathan Cameron <jic23@...nel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: David Lechner <dlechner@...libre.com>,
	Jonathan Corbet <corbet@....net>,
	Support Opensource <support.opensource@...semi.com>,
	Cosmin Tanislav <cosmin.tanislav@...log.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Antoniu Miclaus <antoniu.miclaus@...log.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hwmon@...r.kernel.org,
	linux-iio@...r.kernel.org,
	linux-staging@...ts.linux.dev,
	linux-input@...r.kernel.org,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v2 5/7] iio: frequency: admv1013: Use devm_regulator_get_enable_read_voltage()

We can reduce boilerplate code by using
devm_regulator_get_enable_read_voltage().

The common mode voltage is now passed as a parameter in the init
functions so we can avoid adding a state member that is only used
during init.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: David Lechner <dlechner@...libre.com>
---

v2 changes:
* renamed to devm_regulator_get_enable_read_voltage
* restored error message
---
 drivers/iio/frequency/admv1013.c | 40 ++++++++++------------------------------
 1 file changed, 10 insertions(+), 30 deletions(-)

diff --git a/drivers/iio/frequency/admv1013.c b/drivers/iio/frequency/admv1013.c
index 92923074f930..c0cd5d9844fe 100644
--- a/drivers/iio/frequency/admv1013.c
+++ b/drivers/iio/frequency/admv1013.c
@@ -95,7 +95,6 @@ struct admv1013_state {
 	struct clk		*clkin;
 	/* Protect against concurrent accesses to the device and to data */
 	struct mutex		lock;
-	struct regulator	*reg;
 	struct notifier_block	nb;
 	unsigned int		input_mode;
 	unsigned int		quad_se_mode;
@@ -342,14 +341,9 @@ static int admv1013_update_quad_filters(struct admv1013_state *st)
 					FIELD_PREP(ADMV1013_QUAD_FILTERS_MSK, filt_raw));
 }
 
-static int admv1013_update_mixer_vgate(struct admv1013_state *st)
+static int admv1013_update_mixer_vgate(struct admv1013_state *st, int vcm)
 {
 	unsigned int mixer_vgate;
-	int vcm;
-
-	vcm = regulator_get_voltage(st->reg);
-	if (vcm < 0)
-		return vcm;
 
 	if (vcm <= 1800000)
 		mixer_vgate = (2389 * vcm / 1000000 + 8100) / 100;
@@ -443,7 +437,7 @@ static const struct iio_chan_spec admv1013_channels[] = {
 	ADMV1013_CHAN_CALIB(1, Q),
 };
 
-static int admv1013_init(struct admv1013_state *st)
+static int admv1013_init(struct admv1013_state *st, int vcm_uv)
 {
 	int ret;
 	unsigned int data;
@@ -483,7 +477,7 @@ static int admv1013_init(struct admv1013_state *st)
 	if (ret)
 		return ret;
 
-	ret = admv1013_update_mixer_vgate(st);
+	ret = admv1013_update_mixer_vgate(st, vcm_uv);
 	if (ret)
 		return ret;
 
@@ -498,11 +492,6 @@ static int admv1013_init(struct admv1013_state *st)
 					  st->input_mode);
 }
 
-static void admv1013_reg_disable(void *data)
-{
-	regulator_disable(data);
-}
-
 static void admv1013_powerdown(void *data)
 {
 	unsigned int enable_reg, enable_reg_msk;
@@ -557,11 +546,6 @@ static int admv1013_properties_parse(struct admv1013_state *st)
 	else
 		return -EINVAL;
 
-	st->reg = devm_regulator_get(&spi->dev, "vcm");
-	if (IS_ERR(st->reg))
-		return dev_err_probe(&spi->dev, PTR_ERR(st->reg),
-				     "failed to get the common-mode voltage\n");
-
 	ret = devm_regulator_bulk_get_enable(&st->spi->dev,
 					     ARRAY_SIZE(admv1013_vcc_regs),
 					     admv1013_vcc_regs);
@@ -578,7 +562,7 @@ static int admv1013_probe(struct spi_device *spi)
 {
 	struct iio_dev *indio_dev;
 	struct admv1013_state *st;
-	int ret;
+	int ret, vcm_uv;
 
 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 	if (!indio_dev)
@@ -597,16 +581,12 @@ static int admv1013_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
-	ret = regulator_enable(st->reg);
-	if (ret) {
-		dev_err(&spi->dev, "Failed to enable specified Common-Mode Voltage!\n");
-		return ret;
-	}
+	ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vcm");
+	if (ret < 0)
+		return dev_err_probe(&spi->dev, ret,
+				     "failed to get the common-mode voltage\n");
 
-	ret = devm_add_action_or_reset(&spi->dev, admv1013_reg_disable,
-				       st->reg);
-	if (ret)
-		return ret;
+	vcm_uv = ret;
 
 	st->clkin = devm_clk_get_enabled(&spi->dev, "lo_in");
 	if (IS_ERR(st->clkin))
@@ -620,7 +600,7 @@ static int admv1013_probe(struct spi_device *spi)
 
 	mutex_init(&st->lock);
 
-	ret = admv1013_init(st);
+	ret = admv1013_init(st, vcm_uv);
 	if (ret) {
 		dev_err(&spi->dev, "admv1013 init failed\n");
 		return ret;

-- 
2.43.2