linux-kernel - Re: [PATCH 1/2] misc: rtsx: Move Realtek Card Reader Driver to misc

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Date:   Tue, 24 Oct 2017 11:52:05 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     冯锐 <rui_feng@...lsil.com.cn>,
        gregkh <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ricky_wu@...ltek.com
Subject: Re: [PATCH 1/2] misc: rtsx: Move Realtek Card Reader Driver to misc

On Mon, Oct 23, 2017 at 11:35 AM, Lee Jones <lee.jones@...aro.org> wrote:
> On Thu, 19 Oct 2017, Arnd Bergmann wrote:
>
>> On Thu, Oct 19, 2017 at 5:22 AM,  <rui_feng@...lsil.com.cn> wrote:
>> > From: Rui Feng <rui_feng@...lsil.com.cn>
>> >
>> > Because Realtek PCIE card reader driver is a pcie driver,
>> > and it bridges mmc subsystem and memstick subsystem, it's
>> > not a mfd driver. Greg and Lee Jones had a discussion about
>> > where to put the driver, the result is that misc is a good
>> > place for it, so I move all files to misc. If I don't move
>> > it to a right place, I can't add any patch for this driver.
>> >
>> > Signed-off-by: Rui Feng <rui_feng@...lsil.com.cn>
>> > ---
>> >  drivers/memstick/host/rtsx_pci_ms.c      |  2 +-
>> >  drivers/mfd/Kconfig                      | 11 -----------
>> >  drivers/mfd/Makefile                     |  2 --
>> >  drivers/misc/Kconfig                     |  1 +
>> >  drivers/misc/Makefile                    |  1 +
>> >  drivers/misc/realtek/Kconfig             | 10 ++++++++++
>> >  drivers/misc/realtek/Makefile            |  3 +++
>> >  drivers/{mfd => misc/realtek}/rtl8411.c  |  1 -
>> >  drivers/{mfd => misc/realtek}/rts5209.c  |  1 -
>> >  drivers/{mfd => misc/realtek}/rts5227.c  |  1 -
>>
>> Thanks for redoing the patch. If Lee and Greg want to see it moved
>> here, I won't object, but I'd still like to understand the distinction better,
>> since there are likely going to be other drivers in the same situation
>> (either adding into misc or mfd) and it would be good if we can all
>> give consistent advice.
>>
>> Greg, Lee: can you come up with a simple definition of what an
>> MFD is that this driver does not fit into? What about other
>> PCI drivers like intel-lpss-pci and lpc_ich? Are they different
>> from this one or should they also be moved out of MFD?
>
> MFDs drivers don't *do* anything.  They handle shared resources,
> register featureful devices residing in other subsystems and provide
> simple shared functionality pertaining to the chip as a whole.
>
> These card reader devices *are* the featureful drivers and brim with
> useful functionality.
>
> intel-lpss-pci and lpc_ich conform to the aforementioned definition.

Ok. I think we have some other drivers in MFD that fall into similar
categories as rtsx, maybe the db8500 prcmu for instance, but it
does sound like a reasonable definition. If we ever get too many
drivers like rtsx in drivers/misc, we may have to come up with a
new place for them.

For now

Acked-by: Arnd Bergmann <arnd@...db.de>

to the current patch series.

      Arnd