linux-kernel - Re: [PATCH] PM / OPP: Add support for multiple regulators

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Message-ID: <CANMq1KA1=LTtCD2ic7GcskX7izuEkAqUo1xxwwCXBeTLi0r5vg@mail.gmail.com>
Date:   Wed, 12 Feb 2020 16:57:30 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>, linux-pm@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM / OPP: Add support for multiple regulators

On Wed, Feb 12, 2020 at 4:13 PM Viresh Kumar <viresh.kumar@...aro.org> wrote:
>
> On 12-02-20, 15:55, Nicolas Boichat wrote:
> > The OPP table can contain multiple voltages and regulators, and
> > implementing that logic does not add a lot of code or complexity,
> > so let's modify _generic_set_opp_regulator to support that use
> > case.
> >
> > Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
>
> This is already supported in a different way. See how following driver
> does this (hint dev_pm_opp_register_set_opp_helper()).
>
> drivers/opp/ti-opp-supply.c
>
> The problem with a generic solution is that we can't assume an order
> for programming of the regulators, as this can be complex on few
> platforms.

I see... And you're right that it's probably best to change the
voltages in a specific order (I just ignored that problem ,-P). I do
wonder if there's something we could do in the core/DT to specify that
order (if it's a simple order?), it's not really ideal to have to copy
paste code around...

> --
> viresh