linux-kernel - Re: [RFC PATCH 8/8] mtd: rawnand: ams-delta: Use GPIO callbacks for data I/O

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Date:   Thu, 19 Jul 2018 08:47:49 +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 8/8] mtd: rawnand: ams-delta: Use GPIO callbacks for
 data I/O

On Thu, 19 Jul 2018 01:57:10 +0200
Janusz Krzysztofik <jmkrzyszt@...il.com> wrote:

> Don't readw()/writew() data directly from/to GPIO port which is under
> control of gpio-omap driver, use GPIO chip callbacks instead.
> 
> Thanks to utilization of get/set_multiple() callbacks, performance
> degrade is minor for typical data transfers.

Same comment here, don't use the gpio_chip hooks directly, use the
consumer API instead.

> 
> The driver should now work with any 8+-bit bidirectional GPIO port,
> not only OMAP.
> 
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@...il.com>
> 
> # Conflicts:
> #	drivers/mtd/nand/raw/ams-delta.c

Oh, some leftovers from a conflict resolution :).