linux-kernel - Re: [PATCH v5 13/26] memory: omap-gpmc: Support general purpose input for WAITPINs

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Message-ID: <20160307103855.57720146@bbrezillon>
Date:	Mon, 7 Mar 2016 10:38:55 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Roger Quadros <rogerq@...com>
Cc:	<tony@...mide.com>, <computersforpeace@...il.com>,
	devicetree@...r.kernel.org, nsekhar@...com,
	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
	ezequiel@...guardiasur.com.ar, javier@...hile0.org,
	linux-omap@...r.kernel.org, dwmw2@...radead.org, fcooper@...com
Subject: Re: [PATCH v5 13/26] memory: omap-gpmc: Support general purpose
 input for WAITPINs

On Mon, 7 Mar 2016 10:34:40 +0100
Boris Brezillon <boris.brezillon@...e-electrons.com> wrote:

> Hi Roger,
> 
> On Fri, 19 Feb 2016 23:15:35 +0200
> Roger Quadros <rogerq@...com> wrote:
> 
> > OMAPs can have 2 to 4 WAITPINs that can be used as general purpose
> > input if not used for memory wait state insertion.
> > 
> > The first user will be the OMAP NAND chip to get the NAND
> > read/busy status using gpiolib.
> 
> Just a comment on this approach. Why do you need to exposed native R/B
> pins as GPIOs? I mean, other NAND controllers are supporting R/B
> detection using dedicated logic, and they do not exposed those pins a
> plain GPIOs. Have you considered adding another property (rb-native ?)

Just had a look at the sunxi-nand binding, and we chose "allwinner,rb"
for this native RB logic. So "ti,rb" would be the equivalent for the
gpmc driver.

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com