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regulator: core: Allow generic coupling only for always-on regulators

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The generic voltage balancer doesn't work correctly if one of regulator
couples turns off. Currently there are no users in kernel for that case,
although let's explicitly show that this case is unsupported for those who
will try to use that feature.

Link: https://lore.kernel.org/linux-samsung-soc/20191008170503.yd6GscYPLxjgrXqDuCO7AJc6i6egNZGJkVWHLlCxvA4@z/
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20191025002240.25288-2-digetx@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Dmitry Osipenko 2019-10-25 03:22:40 +03:00 committed by Mark Brown
parent 907becb263
commit e381bfe45a
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1 changed files with 6 additions and 0 deletions
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6
drivers/regulator/core.c
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@ -4963,6 +4963,12 @@ static int generic_coupler_attach(struct regulator_coupler *coupler,
return -EPERM;
}
if (!rdev->constraints->always_on) {
rdev_err(rdev,
"Coupling of a non always-on regulator is unimplemented\n");
return -ENOTSUPP;
}
return 0;
}