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

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Date:   Fri, 22 Sep 2017 13:02:16 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     冯锐 <rui_feng@...lsil.com.cn>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 答复: [PATCH] mfd: rtsx: Add
 support for RTS5260

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.

> It's a card reader driver (as stated below).
> I think this entire file needs relocating somewhere else."
> 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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