linux-kernel - Re: [PATCH 2/2] mfd: add regulator cell to Cherry Trail Whiskey Cove PMIC

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Message-ID: <CAHtQpK6OLkzSO_k6qv_Le3w8bSocwwZWiFSaOWLJLjDkVNSMCQ@mail.gmail.com>
Date:   Fri, 25 Oct 2019 14:00:21 +0200
From:   Andrey Zhizhikin <andrey.z@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     lgirdwood@...il.com, broonie@...nel.org,
        Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org,
        Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>
Subject: Re: [PATCH 2/2] mfd: add regulator cell to Cherry Trail Whiskey Cove PMIC

On Fri, Oct 25, 2019 at 12:49 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Fri, Oct 25, 2019 at 11:16:22AM +0200, Andrey Zhizhikin wrote:
> > On Fri, Oct 25, 2019 at 10:07 AM Andy Shevchenko
> > <andriy.shevchenko@...ux.intel.com> wrote:
> > > On Thu, Oct 24, 2019 at 02:29:39PM +0000, Andrey Zhizhikin wrote:
> > > > Add a regulator mfd cell to Whiskey Cove PMIC driver, which is used to
> > > > supply various voltage rails.
> > > >
> > > > In addition, make the initialization of this mfd driver early enough in
> > > > order to provide regulator cell to mmc sub-system when it is initialized.
> > >
> > > Doesn't deferred probe mechanism work for you?
> > > MMC core returns that error till we have the driver initialized.
> >
> > This would work for mmc sub-system, but my idea was that later when
> > more cells are added to this mfd - it might turn out that we would
> > require an early initialization anyway. So I decided to take an
> > opportunity to adjust it with this patch as well, and this is what I
> > roughly explained in the commit message. When I'm reading it now,
> > exactly this point was not mentioned in commit message at all, and I
> > rather coupled the early init with mmc sub-system, which creates a
> > source of confusion here. I guess if there would be no other
> > objections about early init - I'd go with v2 of this patch, where I
> > would clean-up the point below and adjust the commit description.
> >
> > Thanks a lot for pointing this out!
>
> > > > -static struct i2c_driver cht_wc_driver = {
> > > > +static struct i2c_driver cht_wc_i2c_driver = {
> > >
> > > Renaming is not explained in the commit message.
> >
> > True, this point I forgot to mention. Actually, this is tightly
> > coupled with the fact that mfd driver has been moved to an earlier
> > init stage and since it does belong to I2C sub-system (and represented
> > by i2c_device structure) - I decided to make a name sound more
> > logical.
>
> So, seems you have three changes in one patch. Please, split accordingly.

Got it, thanks! Now I see it would be more logical to have 3 patches
in the following order:
- i2c driver renaming
- additional regulator cell
- early init

If you don't mind - I'd wait for other people to comment on this
patch, collect all points, and then come up with v2 of this patch (and
whole series in fact).

>
> In v2 also Cc all stakeholders I mentioned.

Would certainly do!

>
> --
> With Best Regards,
> Andy Shevchenko
>
>

-- 
Regards,
Andrey.