linux-kernel - [PATCH v5 1/7] iio: accel: adxl345: Make data

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Date: Wed, 27 Mar 2024 22:03:14 +0000
From: Lothar Rubusch <l.rubusch@...il.com>
To: lars@...afoo.de,
	Michael.Hennerich@...log.com,
	jic23@...nel.org,
	robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org
Cc: linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	eraretuya@...il.com,
	l.rubusch@...il.com
Subject: [PATCH v5 1/7] iio: accel: adxl345: Make data_range obsolete

Replace write() data_format by regmap_update_bits(), because bus specific
pre-configuration may have happened before on the same register. For
further updates to the data_format register then bus pre-configuration
needs to be masked out.

Remove the data_range field from the struct adxl345_data, because it is
not used anymore.

Signed-off-by: Lothar Rubusch <l.rubusch@...il.com>
---
 drivers/iio/accel/adxl345_core.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/accel/adxl345_core.c b/drivers/iio/accel/adxl345_core.c
index 8bd30a23e..35df5e372 100644
--- a/drivers/iio/accel/adxl345_core.c
+++ b/drivers/iio/accel/adxl345_core.c
@@ -37,7 +37,15 @@
 #define ADXL345_POWER_CTL_MEASURE	BIT(3)
 #define ADXL345_POWER_CTL_STANDBY	0x00
 
+#define ADXL345_DATA_FORMAT_RANGE	GENMASK(1, 0) /* Set the g range */
+#define ADXL345_DATA_FORMAT_JUSTIFY	BIT(2) /* Left-justified (MSB) mode */
 #define ADXL345_DATA_FORMAT_FULL_RES	BIT(3) /* Up to 13-bits resolution */
+#define ADXL345_DATA_FORMAT_SELF_TEST	BIT(7) /* Enable a self test */
+#define ADXL345_DATA_FORMAT_MSK		(ADXL345_DATA_FORMAT_RANGE | \
+					 ADXL345_DATA_FORMAT_JUSTIFY |  \
+					 ADXL345_DATA_FORMAT_FULL_RES | \
+					 ADXL345_DATA_FORMAT_SELF_TEST)
+
 #define ADXL345_DATA_FORMAT_2G		0
 #define ADXL345_DATA_FORMAT_4G		1
 #define ADXL345_DATA_FORMAT_8G		2
@@ -48,7 +56,6 @@
 struct adxl345_data {
 	const struct adxl345_chip_info *info;
 	struct regmap *regmap;
-	u8 data_range;
 };
 
 #define ADXL345_CHANNEL(index, axis) {					\
@@ -218,15 +225,14 @@ int adxl345_core_probe(struct device *dev, struct regmap *regmap)
 
 	data = iio_priv(indio_dev);
 	data->regmap = regmap;
-	/* Enable full-resolution mode */
-	data->data_range = ADXL345_DATA_FORMAT_FULL_RES;
 	data->info = device_get_match_data(dev);
 	if (!data->info)
 		return -ENODEV;
 
-	ret = regmap_write(data->regmap, ADXL345_REG_DATA_FORMAT,
-			   data->data_range);
-	if (ret < 0)
+	/* Enable full-resolution mode */
+	ret = regmap_update_bits(regmap, ADXL345_REG_DATA_FORMAT,
+				 ADXL345_DATA_FORMAT_MSK, ADXL345_DATA_FORMAT_FULL_RES);
+	if (ret)
 		return dev_err_probe(dev, ret, "Failed to set data range\n");
 
 	indio_dev->name = data->info->name;
-- 
2.25.1