linux-kernel - Re: [PATCH v3] hisi_lpc: Use acpi_dev_for_each

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Date:   Tue, 5 Jul 2022 12:29:27 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     John Garry <john.garry@...wei.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yang Yingliang <yangyingliang@...wei.com>
Subject: Re: [PATCH v3] hisi_lpc: Use acpi_dev_for_each_child()

On Tue, Jul 5, 2022 at 12:16 PM John Garry <john.garry@...wei.com> wrote:
> On 05/07/2022 10:39, Andy Shevchenko wrote:
> > On Tue, Jul 5, 2022 at 11:38 AM Andy Shevchenko
> > <andy.shevchenko@...il.com>  wrote:
> >> On Tue, Jul 5, 2022 at 10:37 AM John Garry<john.garry@...wei.com>  wrote:

...

> >> John, I believe now you may send a formal clean up to convert to platform_device
> > Hit Enter too early:-)
> >
> > ...to platform_device_register_full().
>
> Sure, I can look at that now. But I just found where we previously
> mentioned the possibility of factoring out some of the ACPI platform
> device creation code:
>
> https://lore.kernel.org/linux-acpi/CAHp75VfOa5pN4MKT-aQmWBwPGWsOaQupyfrN-weWwfR3vMLtuA@mail.gmail.com/
>
> There is actually still a comment in the hisi_lpc driver - I should have
> checked there first :)
>
> So my impression is that the hisi_lpc code is almost the same in
> acpi_create_platform_device(), apart from we need do the resource fixup
> in hisi_lpc_acpi_set_io_res().
>
> So we could factor out by dividing acpi_create_platform_device() into 2x
> parts: resource get and then platform dev create. But that does not seem
> wise as we have 2x parts which don't make sense on their own. Or else
> pass a fixup callback into acpi_create_platform_device(). Any other
> ideas if we want to go this way?

I prefer having an ops or so structure where you can pass ->fixup()
and/or ->xlate() function, Btw, it looks like the code in hisi_lpc
needs a lot of cleanups.

-- 
With Best Regards,
Andy Shevchenko