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regmap: mmio: Allow passing an empty config->reg_stride

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Regmap's stride is used for MMIO regmaps to check the correctness of
reg_width. However, it's acceptable to pass an empty config->reg_stride,
in that case the actual stride used is 1.

There are valid cases now to pass an empty stride, when using
down/upshifting of register address. In this case, the stride value
loses its sense, so ignore the reg_width when the stride isn't set.

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com
Link: https://lore.kernel.org/r/20230511142735.316445-1-maxime.chevallier@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org
This commit is contained in:
Maxime Chevallier
2023-05-11 16:27:35 +02:00
committed by Mark Brown
parent f33a751d5a
commit e12ff28764
1 changed files with 1 additions and 1 deletions
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2
drivers/base/regmap/regmap-mmio.c
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@@ -448,7 +448,7 @@ static struct regmap_mmio_context *regmap_mmio_gen_context(struct device *dev,
if (min_stride < 0)
return ERR_PTR(min_stride);
if (config->reg_stride < min_stride)
if (config->reg_stride && config->reg_stride < min_stride)
return ERR_PTR(-EINVAL);
if (config->use_relaxed_mmio && config->io_port)