linux-kernel - Re: [RFC PATCH 0/9] Add support for Microsoft Surface System Aggregator Module

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Message-ID: <41fe48ea-5486-3d06-6fb8-0663e2c930b5@gmail.com>
Date:   Fri, 25 Sep 2020 17:41:42 +0200
From:   Maximilian Luz <luzmaximilian@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh@...nel.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Blaž Hrastnik <blaz@...n.io>,
        Dorian Stoll <dorian.stoll@...p.io>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Gayatri Kammela <gayatri.kammela@...el.com>,
        Darren Hart <dvhart@...radead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>
Subject: Re: [RFC PATCH 0/9] Add support for Microsoft Surface System
 Aggregator Module

On 9/25/20 4:58 PM, Andy Shevchenko wrote:
> On Thu, Sep 24, 2020 at 10:17 PM Maximilian Luz <luzmaximilian@...il.com> wrote:
>> On 9/24/20 10:30 AM, Andy Shevchenko wrote:
>>> On Wed, Sep 23, 2020 at 6:32 PM Arnd Bergmann <arnd@...db.de> wrote:
>>>> On Wed, Sep 23, 2020 at 5:15 PM Maximilian Luz <luzmaximilian@...il.com> wrote:
> 
> ...
> 
>>>> I think this should go to drivers/platform/x86 or drivers/platform/surface/
>>>> along with other laptop vendor specific code rather than drivers/misc/.
>>>
>>> +1 here. drivers/platform/surface is a good place to start.
>>> And you may begin with moving a few Surface drivers out of PDx86 to
>>> the new folder.
>>
>> Perfect, thanks! I'll draft up a patch series over the weekend.
>>
>> A couple questions regarding structure and maintenance:
>>
>>    - Should I CC the platform-driver-x86 list on future submissions to
>>      drivers/platform/surface? I.e. is this something you would want to
>>      review if it doesn't touch the drivers/platform/x86 directory?
> 
> Include PDx86 mailing list to the list of that. Current SURFACE*
> drivers have per driver record in MAINTAINERS IIRC. So, update them as
> well if needed.

Will do.

>>    - How would you want the layout to be, specifically regarding to the
>>      surface-aggregator stuff? My suggestion would be simply:
>>
>>      drivers/platform/surface/
> 
>>          surface_aggregator/
> 
> Don't repeat parts of the path, the aggregator is enough as a folder
> name, but the driver of course should be in its own namespace
> ('surface').

Okay.

>>              Kconfig
>>              Makefile
>>              core.c
>>              controller.c
>>              ... (all core stuff built into the surface_aggregator module)
>>          Kconfig
>>          Makefile
> 
>>          surface_aggregator_debugfs.c
> 
> (Not sure why it's not a part of aggregator folder)

I kind of thought of the aggregator folder to contain only files that
build the core module. surface_aggregator_debugfs is intended as
separate module, to be loaded when needed. So I'd consider it a client
driver to the aggregator in the same way that surface_acpi_notify is.

Let me know if you still want me to move this into the aggregator folder
though. Personally, I just feel that that might lead to a bit of
confusion, specifically the idea that it's built into the core when it's
not.

>>          surface_acpi_notify.c
>>          surface_*.c        (any other surface platform driver as well
>>                              as drivers dependent on surface_aggregator)
>>
>>    - Regarding future things like HID transport driver, battery/AC driver:
>>      Submit them to drivers/platform/surface or to their respective
>>      subsystem directories?
> 
> Respective subsystem _if_ it is a subsystem related driver and not
> kinda board file. Use common sense and existing examples.

Right, thank you!

Regards,
Max