linux-kernel - RE: [RFC PATCH v2 09/14] mtd: nand: add sunxi NFC dt bindings doc

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Date:	Wed, 29 Jan 2014 18:02:33 +0000
From:	"Gupta, Pekon" <pekon@...com>
To:	Rob Herring <robherring2@...il.com>,
	Boris BREZILLON <b.brezillon.dev@...il.com>,
	"Ezequiel Garcia (ezequiel.garcia@...e-electrons.com)" 
	<ezequiel.garcia@...e-electrons.com>,
	Brian Norris <computersforpeace@...il.com>
CC:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"dev@...ux-sunxi.org" <dev@...ux-sunxi.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	Rob Landley <rob@...dley.net>,
	Grant Likely <grant.likely@...aro.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [RFC PATCH v2 09/14] mtd: nand: add sunxi NFC dt bindings doc

Dear Rob, and other DT maintainers,

>From: Rob Herring
[...]
>> +- onfi,nand-timing-mode : mandatory if the chip does not support the ONFI
>> +  standard.
>
>Add to generic nand binding.
>
>> +- allwinner,rb : shall contain the native Ready/Busy ids.
>> + or
>> +- rb-gpios : shall contain the gpios used as R/B pins.
>
>Isn't allwinner,rb implied by a lack of rb-gpios property. Or no R/B
>pin is an option? If so, don't you need some fixed time delay
>properties like max erase time?
>
>rb-gpios could be added to the generic nand binding as well.
>
I do think this should go into generic nand binding, as this is controller specific.
Some controllers have dedicated R/B pin (Ready/Busy) while others may use
GPIO instead. It's the way a hardware controller is designed.

Request you to please consider Ack from MTD Maintainers 'at-least' for
generic NAND DT bindings. There is already a discussion going in
a separate thread for which is still not awaiting replies [1].

[1] http://lists.infradead.org/pipermail/linux-mtd/2014-January/051625.html


with regards, pekon
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