[PATCH v1 1/1] regmap: Add REG_FIELD_GENMASK() helper macro

[Andy Shevchenko]

One time in regmap and already a few times over the whole kernel
the users want to extract a mask from the regmap field data type.
Provide a helper and convert regmap core to use it. Others may
follow later on.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---

Inspired by a patch SN1PR12MB25282EC93A27F3577BB9B454A5772@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
that leaves the driver to handle the custom macro for that.

 drivers/base/regmap/regmap.c | 2 +-
 include/linux/regmap.h       | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 83f1f5942135..48e96bc9e7b6 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1215,7 +1215,7 @@ static void regmap_field_init(struct regmap_field *rm_field,
 	rm_field->regmap = regmap;
 	rm_field->reg = reg_field.reg;
 	rm_field->shift = reg_field.lsb;
-	rm_field->mask = GENMASK(reg_field.msb, reg_field.lsb);
+	rm_field->mask = REG_FIELD_GENMASK(reg_field);
 
 	WARN_ONCE(rm_field->mask == 0, "invalid empty mask defined\n");
 
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index a72f17ab6264..8f3034881f8a 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -10,6 +10,7 @@
  * Author: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
  */
 
+#include <linux/bits.h>
 #include <linux/bug.h>
 #include <linux/cleanup.h>
 #include <linux/delay.h>
@@ -1477,6 +1478,8 @@ struct reg_field {
 				.id_offset = _offset,		\
 				}
 
+#define REG_FIELD_GENMASK(_reg_field)	GENMASK(_reg_field.msb, _reg_field.lsb)
+
 struct regmap_field *regmap_field_alloc(struct regmap *regmap,
 		struct reg_field reg_field);
 void regmap_field_free(struct regmap_field *field);
-- 
2.50.1