[PATCH] regulator: lp873x: Use bitfield helpers

[Geert Uytterhoeven]

Use the FIELD_PREP() helper, instead open-coding the same operation.

Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
Compile-tested only.

See "[PATCH 00/17] Non-const bitfield helper conversions"
(https://lore.kernel.org/r/cover.1637592133.git.geert+renesas@xxxxxxxxx)
for background and more conversions.
---
 drivers/regulator/lp873x-regulator.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/lp873x-regulator.c b/drivers/regulator/lp873x-regulator.c
index c38387e0fbb2a33d..f1f5be7b54cd9e90 100644
--- a/drivers/regulator/lp873x-regulator.c
+++ b/drivers/regulator/lp873x-regulator.c
@@ -13,6 +13,7 @@
  * GNU General Public License version 2 for more details.
  */
 
+#include <linux/bitfield.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
@@ -101,7 +102,7 @@ static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
 
 	ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
 				 LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
-				 reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE));
+				 FIELD_PREP(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE, reg));
 	if (ret) {
 		dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
 		return ret;
-- 
2.25.1