[PATCH v6 0/2] iio: magnetometer: bmc150: use FIELD_PREP and FIELD_GET helpers

[PATCH v6 0/2] iio: magnetometer: bmc150: use FIELD_PREP and FIELD_GET helpers

[Hungyu Lin]

v6:
 - Group linux/*.h and linux/iio/*.h includes separately
   as suggested by Andy Shevchenko

v5:
 - Remove the extra blank line in bmc150_magn_get_odr()
   that was inadvertently retained in v4

v4:
 - Split include sorting into a separate prerequisite patch

v3:
 - Add missing include <linux/bitfield.h>

v2:
 - Use FIELD_PREP() and FIELD_GET() helpers as suggested by
   Jonathan Cameron
 - Simplify bmc150_magn_set_odr() by returning directly from
   the matching table entry

Hungyu Lin (2):
  iio: magnetometer: bmc150: sort includes
  iio: magnetometer: bmc150: use FIELD_PREP and FIELD_GET helpers

 drivers/iio/magnetometer/bmc150_magn.c | 50 +++++++++++++-------------
 1 file changed, 24 insertions(+), 26 deletions(-)

-- 
2.34.1

[PATCH v6 1/2] iio: magnetometer: bmc150: sort includes

[Hungyu Lin]

Sort the include list alphabetically.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Hungyu Lin <dennylin0707@gmail.com>
---
 drivers/iio/magnetometer/bmc150_magn.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/iio/magnetometer/bmc150_magn.c b/drivers/iio/magnetometer/bmc150_magn.c
index bf2551988008..f6639d7fab04 100644
--- a/drivers/iio/magnetometer/bmc150_magn.c
+++ b/drivers/iio/magnetometer/bmc150_magn.c
@@ -9,23 +9,24 @@
  * (C) Copyright 2011~2014 Bosch Sensortec GmbH All Rights Reserved
  */
 
-#include <linux/module.h>
-#include <linux/i2c.h>
-#include <linux/interrupt.h>
 #include <linux/cleanup.h>
 #include <linux/delay.h>
-#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
-#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
 #include <linux/iio/buffer.h>
 #include <linux/iio/events.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
 #include <linux/iio/trigger.h>
 #include <linux/iio/trigger_consumer.h>
 #include <linux/iio/triggered_buffer.h>
-#include <linux/regmap.h>
-#include <linux/regulator/consumer.h>
 
 #include "bmc150_magn.h"
 
-- 
2.34.1

[PATCH v6 2/2] iio: magnetometer: bmc150: use FIELD_PREP and FIELD_GET helpers

[Hungyu Lin]

Replace open-coded bitfield operations with FIELD_PREP() and
FIELD_GET() helpers where appropriate.

Also simplify bmc150_magn_set_odr() by returning directly from
the matching table entry.

Signed-off-by: Hungyu Lin <dennylin0707@gmail.com>
---
 drivers/iio/magnetometer/bmc150_magn.c | 33 ++++++++++++--------------
 1 file changed, 15 insertions(+), 18 deletions(-)

diff --git a/drivers/iio/magnetometer/bmc150_magn.c b/drivers/iio/magnetometer/bmc150_magn.c
index f6639d7fab04..ee8092d4006c 100644
--- a/drivers/iio/magnetometer/bmc150_magn.c
+++ b/drivers/iio/magnetometer/bmc150_magn.c
@@ -9,6 +9,7 @@
  * (C) Copyright 2011~2014 Bosch Sensortec GmbH All Rights Reserved
  */
 
+#include <linux/bitfield.h>
 #include <linux/cleanup.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
@@ -246,14 +247,14 @@ static int bmc150_magn_set_power_mode(struct bmc150_magn_data *data,
 		return regmap_update_bits(data->regmap,
 					  BMC150_MAGN_REG_OPMODE_ODR,
 					  BMC150_MAGN_MASK_OPMODE,
-					  BMC150_MAGN_MODE_SLEEP <<
-					  BMC150_MAGN_SHIFT_OPMODE);
+					  FIELD_PREP(BMC150_MAGN_MASK_OPMODE,
+						  BMC150_MAGN_MODE_SLEEP));
 	case BMC150_MAGN_POWER_MODE_NORMAL:
 		return regmap_update_bits(data->regmap,
 					  BMC150_MAGN_REG_OPMODE_ODR,
 					  BMC150_MAGN_MASK_OPMODE,
-					  BMC150_MAGN_MODE_NORMAL <<
-					  BMC150_MAGN_SHIFT_OPMODE);
+					  FIELD_PREP(BMC150_MAGN_MASK_OPMODE,
+						  BMC150_MAGN_MODE_NORMAL));
 	}
 
 	return -EINVAL;
@@ -291,7 +292,7 @@ static int bmc150_magn_get_odr(struct bmc150_magn_data *data, int *val)
 	ret = regmap_read(data->regmap, BMC150_MAGN_REG_OPMODE_ODR, &reg_val);
 	if (ret < 0)
 		return ret;
-	odr_val = (reg_val & BMC150_MAGN_MASK_ODR) >> BMC150_MAGN_SHIFT_ODR;
+	odr_val = FIELD_GET(BMC150_MAGN_MASK_ODR, reg_val);
 
 	for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++)
 		if (bmc150_magn_samp_freq_table[i].reg_val == odr_val) {
@@ -304,21 +305,17 @@ static int bmc150_magn_get_odr(struct bmc150_magn_data *data, int *val)
 
 static int bmc150_magn_set_odr(struct bmc150_magn_data *data, int val)
 {
-	int ret;
 	u8 i;
 
 	for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) {
-		if (bmc150_magn_samp_freq_table[i].freq == val) {
-			ret = regmap_update_bits(data->regmap,
-						 BMC150_MAGN_REG_OPMODE_ODR,
-						 BMC150_MAGN_MASK_ODR,
-						 bmc150_magn_samp_freq_table[i].
-						 reg_val <<
-						 BMC150_MAGN_SHIFT_ODR);
-			if (ret < 0)
-				return ret;
-			return 0;
-		}
+		if (bmc150_magn_samp_freq_table[i].freq != val)
+			continue;
+
+		return regmap_update_bits(data->regmap,
+					 BMC150_MAGN_REG_OPMODE_ODR,
+					 BMC150_MAGN_MASK_ODR,
+					 FIELD_PREP(BMC150_MAGN_MASK_ODR,
+						 bmc150_magn_samp_freq_table[i].reg_val));
 	}
 
 	return -EINVAL;
@@ -801,7 +798,7 @@ static int bmc150_magn_data_rdy_trigger_set_state(struct iio_trigger *trig,
 
 	ret = regmap_update_bits(data->regmap, BMC150_MAGN_REG_INT_DRDY,
 				 BMC150_MAGN_MASK_DRDY_EN,
-				 state << BMC150_MAGN_SHIFT_DRDY_EN);
+				 FIELD_PREP(BMC150_MAGN_MASK_DRDY_EN, state));
 	if (ret < 0)
 		return ret;
 
-- 
2.34.1

Re: [PATCH v6 2/2] iio: magnetometer: bmc150: use FIELD_PREP and FIELD_GET helpers

[Jonathan Cameron]

On Wed, 10 Jun 2026 13:58:31 +0000
Hungyu Lin <dennylin0707@gmail.com> wrote:

> Replace open-coded bitfield operations with FIELD_PREP() and
> FIELD_GET() helpers where appropriate.
> 
> Also simplify bmc150_magn_set_odr() by returning directly from
> the matching table entry.
> 
> Signed-off-by: Hungyu Lin <dennylin0707@gmail.com>
Andy mentioned in previous patch - slow down!  More than one version a day
is very rarely appropriate.  That creates a lot of noise on the list
and means that you aren't gathering up multiple bits of feedback before
posting a new verison.

Anything I apply for IIO is now 7.3 material so this isn't going upstream
for about 3 months anyway so take your time!

The alignment is not the preferred amount for pretty much all cases.
Rather than go to v7, applied but with this fix up:
Note that it is on the testing branch of iio.git which will get rebased
on rc1 once available in about 3 weeks time.

diff --git a/drivers/iio/magnetometer/bmc150_magn.c b/drivers/iio/magnetometer/bmc150_magn.c
index ee8092d4006c..32dff9cdd0f7 100644
--- a/drivers/iio/magnetometer/bmc150_magn.c
+++ b/drivers/iio/magnetometer/bmc150_magn.c
@@ -248,13 +248,13 @@ static int bmc150_magn_set_power_mode(struct bmc150_magn_data *data,
                                          BMC150_MAGN_REG_OPMODE_ODR,
                                          BMC150_MAGN_MASK_OPMODE,
                                          FIELD_PREP(BMC150_MAGN_MASK_OPMODE,
-                                                 BMC150_MAGN_MODE_SLEEP));
+                                                    BMC150_MAGN_MODE_SLEEP));
        case BMC150_MAGN_POWER_MODE_NORMAL:
                return regmap_update_bits(data->regmap,
                                          BMC150_MAGN_REG_OPMODE_ODR,
                                          BMC150_MAGN_MASK_OPMODE,
                                          FIELD_PREP(BMC150_MAGN_MASK_OPMODE,
-                                                 BMC150_MAGN_MODE_NORMAL));
+                                                    BMC150_MAGN_MODE_NORMAL));
        }
 
        return -EINVAL;
@@ -312,10 +312,10 @@ static int bmc150_magn_set_odr(struct bmc150_magn_data *data, int val)
                        continue;
 
                return regmap_update_bits(data->regmap,
-                                        BMC150_MAGN_REG_OPMODE_ODR,
-                                        BMC150_MAGN_MASK_ODR,
-                                        FIELD_PREP(BMC150_MAGN_MASK_ODR,
-                                                bmc150_magn_samp_freq_table[i].reg_val));
+                                         BMC150_MAGN_REG_OPMODE_ODR,
+                                         BMC150_MAGN_MASK_ODR,
+                                         FIELD_PREP(BMC150_MAGN_MASK_ODR,
+                                                    bmc150_magn_samp_freq_table[i].reg_val));
        }
 
> ---
>  drivers/iio/magnetometer/bmc150_magn.c | 33 ++++++++++++--------------
>  1 file changed, 15 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/iio/magnetometer/bmc150_magn.c b/drivers/iio/magnetometer/bmc150_magn.c
> index f6639d7fab04..ee8092d4006c 100644
> --- a/drivers/iio/magnetometer/bmc150_magn.c
> +++ b/drivers/iio/magnetometer/bmc150_magn.c
> @@ -9,6 +9,7 @@
>   * (C) Copyright 2011~2014 Bosch Sensortec GmbH All Rights Reserved
>   */
>  
> +#include <linux/bitfield.h>
>  #include <linux/cleanup.h>
>  #include <linux/delay.h>
>  #include <linux/i2c.h>
> @@ -246,14 +247,14 @@ static int bmc150_magn_set_power_mode(struct bmc150_magn_data *data,
>  		return regmap_update_bits(data->regmap,
>  					  BMC150_MAGN_REG_OPMODE_ODR,
>  					  BMC150_MAGN_MASK_OPMODE,
> -					  BMC150_MAGN_MODE_SLEEP <<
> -					  BMC150_MAGN_SHIFT_OPMODE);
> +					  FIELD_PREP(BMC150_MAGN_MASK_OPMODE,
> +						  BMC150_MAGN_MODE_SLEEP));
Should be aligned as:
					  FIELD_PREP(BMC150_MAGN_MASK_OPMODE,
						     BMC150_MAGN_MODE_SLEEP));

>  	case BMC150_MAGN_POWER_MODE_NORMAL:
>  		return regmap_update_bits(data->regmap,
>  					  BMC150_MAGN_REG_OPMODE_ODR,
>  					  BMC150_MAGN_MASK_OPMODE,
> -					  BMC150_MAGN_MODE_NORMAL <<
> -					  BMC150_MAGN_SHIFT_OPMODE);
> +					  FIELD_PREP(BMC150_MAGN_MASK_OPMODE,
> +						  BMC150_MAGN_MODE_NORMAL));
Same here.

>  	}
>  
>  	return -EINVAL;
> @@ -291,7 +292,7 @@ static int bmc150_magn_get_odr(struct bmc150_magn_data *data, int *val)
>  	ret = regmap_read(data->regmap, BMC150_MAGN_REG_OPMODE_ODR, &reg_val);
>  	if (ret < 0)
>  		return ret;
> -	odr_val = (reg_val & BMC150_MAGN_MASK_ODR) >> BMC150_MAGN_SHIFT_ODR;
> +	odr_val = FIELD_GET(BMC150_MAGN_MASK_ODR, reg_val);
>  
>  	for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++)
>  		if (bmc150_magn_samp_freq_table[i].reg_val == odr_val) {
> @@ -304,21 +305,17 @@ static int bmc150_magn_get_odr(struct bmc150_magn_data *data, int *val)
>  
>  static int bmc150_magn_set_odr(struct bmc150_magn_data *data, int val)
>  {
> -	int ret;
>  	u8 i;
>  
>  	for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) {
> -		if (bmc150_magn_samp_freq_table[i].freq == val) {
> -			ret = regmap_update_bits(data->regmap,
> -						 BMC150_MAGN_REG_OPMODE_ODR,
> -						 BMC150_MAGN_MASK_ODR,
> -						 bmc150_magn_samp_freq_table[i].
> -						 reg_val <<
> -						 BMC150_MAGN_SHIFT_ODR);
> -			if (ret < 0)
> -				return ret;
> -			return 0;
> -		}
> +		if (bmc150_magn_samp_freq_table[i].freq != val)
> +			continue;
> +
> +		return regmap_update_bits(data->regmap,
> +					 BMC150_MAGN_REG_OPMODE_ODR,
> +					 BMC150_MAGN_MASK_ODR,
> +					 FIELD_PREP(BMC150_MAGN_MASK_ODR,
> +						 bmc150_magn_samp_freq_table[i].reg_val));
and here should be
		return regmap_update_bits(data->regmap,
					  BMC150_MAGN_REG_OPMODE_ODR,
					  BMC150_MAGN_MASK_ODR,
					  FIELD_PREP(BMC150_MAGN_MASK_ODR,
						     bmc150_magn_samp_freq_table[i].reg_val));

>  	}
>  
>  	return -EINVAL;
> @@ -801,7 +798,7 @@ static int bmc150_magn_data_rdy_trigger_set_state(struct iio_trigger *trig,
>  
>  	ret = regmap_update_bits(data->regmap, BMC150_MAGN_REG_INT_DRDY,
>  				 BMC150_MAGN_MASK_DRDY_EN,
> -				 state << BMC150_MAGN_SHIFT_DRDY_EN);
> +				 FIELD_PREP(BMC150_MAGN_MASK_DRDY_EN, state));
>  	if (ret < 0)
>  		return ret;
>  

Re: [PATCH v6 2/2] iio: magnetometer: bmc150: use FIELD_PREP and FIELD_GET helpers

[Hungyu Lin]

> The alignment is not the preferred amount for pretty much all cases.
> Rather than go to v7, applied but with this fix up:
> Note that it is on the testing branch of iio.git which will get rebased
> on rc1 once available in about 3 weeks time.

Thanks for the review and for applying the series.

I appreciate the fixup and will be more careful about posting
multiple revisions in quick succession in the future.

Thanks,
Hungyu

Re: [PATCH v6 0/2] iio: magnetometer: bmc150: use FIELD_PREP and FIELD_GET helpers

[Andy Shevchenko]

On Wed, Jun 10, 2026 at 01:58:29PM +0000, Hungyu Lin wrote:

Both now are fine to me,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

-- 
With Best Regards,
Andy Shevchenko