Re: [PATCH] regulator: core: Make regulator object reflect configured voltage

From: Bjorn Andersson
Date: Tue Feb 04 2014 - 13:02:24 EST

On Tue, Feb 4, 2014 at 3:05 AM, Mark Brown <broonie@xxxxxxxxxx> wrote:
> On Mon, Feb 03, 2014 at 09:54:28PM -0800, Bjorn Andersson wrote:
>> + /*
>> + * Make the regulator reflect the configured voltage selected in
>> + * machine_constraints_voltage()
>> + */
>> + if (rdev->constraints->apply_uV &&
>> + rdev->constraints->min_uV == rdev->constraints->max_uV) {
>> + regulator->min_uV = rdev->constraints->min_uV;
>> + regulator->max_uV = rdev->constraints->min_uV;
>> + }
>> +
> Why not do this at the time we apply the voltage? That would seem to be
> more robust, doing it in a separate place means that we might update one
> bit of code and not the other or might change the execution path so that
> one gets run and the other doesn't.

I do share your concerns about having this logic mirrored here is
risky, unfortunately the regulator object is created upon request from
a consumer; so it is not available when regulator_register() calls

An alternative is to drop the conditional setting of
REGULATOR_CHANGE_VOLTAGE from of_regulator.c and force the regulator
drivers to set this flag explicitly; to avoid the difference in
behavior depending on configuration.

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