linux-kernel - Re: [RFC PATCH 3/9] of: mtd: add NAND timings retrieval support

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Message-ID: <20140109173505.GB8899@obsidianresearch.com>
Date:	Thu, 9 Jan 2014 10:35:05 -0700
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	boris brezillon <b.brezillon@...rkiz.com>
Cc:	devicetree@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	linux-doc@...r.kernel.org, dev@...ux-sunxi.org,
	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
	Rob Landley <rob@...dley.net>,
	Grant Likely <grant.likely@...aro.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 3/9] of: mtd: add NAND timings retrieval support

On Thu, Jan 09, 2014 at 09:36:18AM +0100, boris brezillon wrote:

> >You might want to check if you can boil down the DT timings from the
> >huge list to just an ONFI mode number..
> 
> Sure, but the sunxi driver needs at least 19 of them...

So does mvebu's NAND driver..

What I ment was you could have a

  onfi,nand-timing-mode = 0

in the DT. Each of the modes defines all ~19 parameters, higher modes
are faster.

Pick a mode value that fits all the parameters of the connected
non-ONFI flash.

This would be instead of defining each parameter
individually.. Provide some helpers to convert from a onfi mode number
to all the onfi defined timing parameters so that drivers can
configure the HW..

Jason
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