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regmap: add WARN_ONCE when invalid mask is provided to regmap_field_init()

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In regmap_field_init() when a invalid mask is provided it still
initializes with any warnings.

An example of this is when the LSB is greater than MSB a mask of zero
is produced.

WARN_ONCE() is not ideal for this but requires less changes to core regmap
code.

Cc: Mark Brown <broonie@kernel.org>
Cc: Nishanth Menon <nm@ti.com>
Signed-off-by: Matt Ranostay <mranostay@ti.com>
Link: https://lore.kernel.org/r/20220708013125.313892-1-mranostay@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Matt Ranostay 2022-07-07 18:31:25 -07:00 committed by Mark Brown
parent 773d09b4c3
commit cf39ed2e8e
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1 changed files with 3 additions and 0 deletions
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3
drivers/base/regmap/regmap.c
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@ -1298,6 +1298,9 @@ static void regmap_field_init(struct regmap_field *rm_field,
rm_field->reg = reg_field.reg;
rm_field->shift = reg_field.lsb;
rm_field->mask = GENMASK(reg_field.msb, reg_field.lsb);
WARN_ONCE(rm_field->mask == 0, "invalid empty mask defined\n");
rm_field->id_size = reg_field.id_size;
rm_field->id_offset = reg_field.id_offset;
}