linux-kernel - Re: [RFC PATCH 0/8] mtd: rawnand: ams-delta: Use gpio-omap accessors for data I/O

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Message-ID: <20180720212521.483d27a5@bbrezillon>
Date:   Fri, 20 Jul 2018 21:25:21 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Janusz Krzysztofik <jmkrzyszt@...il.com>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Tony Lindgren <tony@...mide.com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Subject: Re: [RFC PATCH 0/8] mtd: rawnand: ams-delta: Use gpio-omap
 accessors for data I/O

On Fri, 20 Jul 2018 19:55:42 +0200
Janusz Krzysztofik <jmkrzyszt@...il.com> wrote:

> Hi Boris,
> 
> On Thursday, July 19, 2018 8:15:08 AM CEST Boris Brezillon wrote:
> > Hi Janusz,
> > 
> > On Thu, 19 Jul 2018 01:57:02 +0200
> > Janusz Krzysztofik <jmkrzyszt@...il.com> wrote:
> >   
> > > Implement the idea suggested by Artem Bityutskiy and Tony Lindgren
> > > described in commit b027274d2e3a ("mtd: ams-delta: fix
> > > request_mem_region() failure").  
> > 
> > Thanks for doing that. I'll review the patches, but I already have a
> > extra request: can you convert this driver to ->exec_op()? It does not
> > necessarily have to be done in this patchset, but, that'd be great to
> > have one more driver converted to the new interface.  
> 
> OK, I'll have a look as my free time permits.
> 
> > BTW, there seems to be a nand_gpio driver, maybe we should merge
> > ams-delta code into nand_gpio after it's been patched to use the GPIO
> > consumer API.  
> 
> nand_gpio uses a form of read()/write() on a single bidirectional register for 
> data transfer, not GPIO, and it does not make use of NRE / NWE signals.  Maybe 
> the two drivers could be merged to some extent but not entirely, I think.

Well, yes, right now the nand-gpio driver is assuming the data bus
is not bit-banged, but that's something we can easily add. Anyway, my
remark was more a "nice to have" not a hard requirement.