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Date:   Wed, 25 Oct 2017 08:45:15 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     冯锐 <rui_feng@...lsil.com.cn>
Cc:     Arnd Bergmann <arnd@...db.de>, gregkh <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "ricky_wu@...ltek.com" <ricky_wu@...ltek.com>
Subject: Re: 答复: [PATCH 1/2] misc: rtsx:
 Move Realtek Card Reader Driver to misc

On Wed, 25 Oct 2017, 冯锐 wrote:

> > On Tue, 24 Oct 2017, Arnd Bergmann wrote:
> > 
> > > 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
> > 
> > Yes, the rts drivers should be moved as they do not conform and are still in
> > active development.  And I agree that there is an argument for the x8500 set
> > to be considered as platform drivers.  However, since they are now stable I
> > see no reason to move them unnecessarily.
> > 
> > > 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.
> > 
> > Agreed.
> > 
> > > For now
> > >
> > > Acked-by: Arnd Bergmann <arnd@...db.de>
> > 
> > Thanks.
> > 
> > Rui, please add this to your set.
> > 
> Do you mean adding " Acked-by: Arnd Bergmann <arnd@...db.de>" to my set or something else?

Yes.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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