linux-kernel - Re: [PATCH 11/15] soc: octeontx2: Add Marvell OcteonTX2 CGX driver

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Message-ID: <CAK8P3a0p2PdjVS+QVMtiYK+5=ToeLSfjvf5X85S0HK2Om4fZ1Q@mail.gmail.com>
Date:   Fri, 31 Aug 2018 20:29:29 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Sunil Kovvuri <sunil.kovvuri@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Olof Johansson <olof@...om.net>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-soc@...r.kernel.org, sgoutham@...vell.com
Subject: Re: [PATCH 11/15] soc: octeontx2: Add Marvell OcteonTX2 CGX driver

On Fri, Aug 31, 2018 at 6:01 PM Sunil Kovvuri <sunil.kovvuri@...il.com> wrote:
> On Fri, Aug 31, 2018 at 7:50 PM Arnd Bergmann <arnd@...db.de> wrote:

>
> Thanks for the suggestion, that does makes sense.
> Actually i did thought about it, but i was skeptical if it would be
> acceptable to make
> a single module out of drivers registering for two different PCI devices.

I don't think it matters much whether there is one module or two
(others might have a strong opinion one way or the other).

What is important though are these two points:

- How to represent the two PCI devices to user space: You should only
  have one interface to user space I think, and this should be similar
  to how other drivers manage similar cases (I don't actually know what they
  do, but I assume you've done some research here)

- How you connect find the pair of devices: Generally speaking while
  the SoC might only have one of each, you shouldn't make that assumption
  in the code, but instead have a reliable way of having one driver wait
  for the other driver to finish probing so you can match the pair.

> Will wait for few more days for more feedback from anyone and port v2 series.

Ok.

      Arnd