linux-kernel - Re: 答复: 答复: [PATCH] mfd: rtsx: Add support for RTS5260

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Date:   Wed, 4 Oct 2017 12:15:35 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     冯锐 <rui_feng@...lsil.com.cn>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        吳昊澄 Ricky <ricky_wu@...ltek.com>
Subject: Re: 答复: 答复: [PATCH] mfd:
 rtsx: Add support for RTS5260

On Fri, 29 Sep 2017, 冯锐 wrote:
> > On Fri, 22 Sep 2017, 冯锐 wrote:
> > 
> > > > On Fri, Sep 22, 2017 at 05:36:24PM +0800, rui_feng@...lsil.com.cn wrote:
> > > > > From: rui_feng <rui_feng@...lsil.com.cn>
> > > > >
> > > > > Add support for new chip rts5260.
> > > > > In order to support rts5260，the definitions of some internal
> > > > > registers and workflow have to be modified and are different from
> > > > > its predecessors. So we need this patch to ensure RTS5260 can work.
> > > > >
> > > > > Signed-off-by: Rui Feng <rui_feng@...lsil.com.cn>
> > > >
> > > > Nit, this name needs to match your "From:" line.  It almost does :)
> > > >
> > > > Why is this a drivers/misc/ driver?
> > > >
> > > I want to put this driver in mfd because other drivers like
> > > rts5249,rts5227 and so on are in mfd, but lee jones said " There is way too
> > much code in this file to be an MFD driver.
> > 
> > There's more to it than that.
> > 
> > It's not an MFD driver because it's a card reader an nothing else.
> > 
> > MFDs cross subsystem boundaries, whereas this is just a card reader.
> > 
> > MFD isn't a dumping ground for devices which don't belong anywhere else.
> 
> The functions in rts5260.c are called by drivers/mmc/host/rtsx_pci_sdmmc.c, it cross

What subsystem boundary does it cross?  MMC and ... ?

> Because many other similar drivers are in mfd, if relocate rts5260 now will lead to a much bigger modification,

Totally fine.

> and customer is in need of this patch. I think put rts5260 in mfd is
> better now.

The upstream kernel is not customer focused.

> If mfd is really not the right place,

MFD is not the right place.

> I will relocate it later not in this patch.
> Greg, what do you think of putting rts5260 in mfd?

Trying to leap-frog me will only seek to annoy and will not help your
cause.

> > > So I put it here.
> > 
> > Without creating a new subsystem, I can't think of a better place for it either.
> > 
> > > > > --- /dev/null
> > > > > +++ b/drivers/misc/rts5260.c
> > > > > @@ -0,0 +1,590 @@
> > > > > +/* Driver for Realtek PCI-Express card reader
> > > > > + *
> > > > > + * Copyright(c) 2016-2017 Realtek Semiconductor Corp. All rights
> > reserved.
> > > > > + *
> > > > > + * This program is free software; you can redistribute it and/or
> > > > > +modify it
> > > > > + * under the terms of the GNU General Public License as published
> > > > > +by the
> > > > > + * Free Software Foundation; either version 2, or (at your
> > > > > +option) any
> > > > > + * later version.
> > > >
> > > > Do you really mean "any later version"?  (I have to ask...)
> > > >
> > > > > + *
> > > > > + * This program is distributed in the hope that it will be
> > > > > + useful, but
> > > > > + * WITHOUT ANY WARRANTY; without even the implied warranty of
> > > > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
> > the
> > > > GNU
> > > > > + * General Public License for more details.
> > > > > + *
> > > > > + * You should have received a copy of the GNU General Public
> > > > > + License along
> > > > > + * with this program; if not, see <http://www.gnu.org/licenses/>.
> > > > > + *
> > > > > + * Author:
> > > > > + *   Steven FENG <steven_feng@...lsil.com.cn>
> > > > > + *   Rui FENG <rui_feng@...lsil.com.cn>
> > > > > + *   Wei WANG <wei_wang@...lsil.com.cn>
> > > > > + */
> > > > > +
> > > > > +#include <linux/module.h>
> > > > > +#include <linux/delay.h>
> > > > > +#include <linux/mfd/rtsx_pci.h>
> > > > > +
> > > > > +#include "../mfd/rtsx_pcr.h"
> > > >
> > > > That looks "odd" :(
> > 
> > This is odd.
> > 
> > You should move that file into include/.
> > 

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