linux-kernel - Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

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Date:   Thu, 30 Apr 2020 14:07:59 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     saravanan sekar <sravanhome@...il.com>
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald <pmeerw@...erw.net>,
        Sebastian Reichel <sre@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v9 2/6] mfd: mp2629: Add support for mps battery charger

On Thu, Apr 30, 2020 at 1:39 PM saravanan sekar <sravanhome@...il.com> wrote:
> On 27/04/20 11:30 am, saravanan sekar wrote:
> > On 27/04/20 10:51 am, Lee Jones wrote:
> >> On Fri, 24 Apr 2020, saravanan sekar wrote:
> >>> On 24/04/20 12:53 pm, Lee Jones wrote:
> >>>> On Fri, 24 Apr 2020, saravanan sekar wrote:
> >>>>> On 24/04/20 11:37 am, Lee Jones wrote:
> >>>>>> On Fri, 24 Apr 2020, saravanan sekar wrote:

...

> >>>>>> Then how about using 'simple-mfd' and 'syscon'?
> >>>>>>
> >>>>>> Then you can omit this driver completely.
> >>>>> The exception is to support for non device tree platform as well,
> >>>>> but I have
> >>>>> tested only for ARM device tree platform.
> >>>> Is that a reality though?
> >>>>
> >>>> How else do you see this realistically being registered?
> >>>>
> >>> I understand that acpi related device table are not covered here,
> >>> well I
> >>> don't have to platform to test so.
> >>> If you ask me to cover acpi related table, I can do but hard to test.
> >> I don't know of any reasons why syscon can't be used by ACPI.
> >>
> >> Please try to solve this issue using 'simple-mfd' and 'syscon'.
> > Well the simple-mfd and syscon topic recommended by you when Device
> > tree alone is used.
> > I wounder still I receive review/improvements comments for this mfd
> > patch and also another
> > to omit this driver using simple-mfd (rework the series).
> > Confused, not sure which is valid and will be accepted at the end.
>
> I had look into syscon, as far my understanding syscon is supported only
> for memory mapped IO. MP2629
> device is over I2C bus, could you share your thought about syscon for
> this device?

My understanding too, but I didn't dug into it.
Something like general regmap support is missing (or I am missing the
way how to pass it to syscon).

-- 
With Best Regards,
Andy Shevchenko