linux-kernel - Re: [PATCH] regulator: core: Allow dummy regulators for supplies

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Date:   Thu, 13 Apr 2017 21:44:42 +0800
From:   Dong Aisheng <dongas86@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     "A.S. Dong" <aisheng.dong@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Robin Gong <yibin.gong@....com>
Subject: Re: [PATCH] regulator: core: Allow dummy regulators for supplies

Hi Mark,

On Thu, Apr 13, 2017 at 8:20 PM, Mark Brown <broonie@...nel.org> wrote:
> On Wed, Apr 12, 2017 at 03:33:14PM +0000, A.S. Dong wrote:
>
>> Now we allow a supply to be a dummy regulator. But due to
>> fc42112c0eaa ("regulator: core: Propagate voltage changes to supply regulators")
>> which supports propagate voltage change to supply regulator,
>> then it will certainly fail if we want to configure a dummy supply.
>>
>> I tried a quick fix as follows and test seemed ok.
>
>> -       if (rdev->supply && (rdev->desc->min_dropout_uV ||
>> +       if (rdev->supply && rdev->supply->rdev != dummy_regulator_rdev &&
>> +                               (rdev->desc->min_dropout_uV ||
>
>> Not sure if it's a sufficient fix.
>> Please help check it.
>
> Ah, of course.  That'll work but I don't think it's the best solution -
> there are some other regulators that also won't support setting voltages
> but might get used as supplies so we should do something based on the
> properties of the regulator rather than based specifically on the dummy
> regulator.  Let me see..

Yes, i was also wondering that..
Let's waiting for you...

Thanks

Regards
Dong Aisheng