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

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Message-ID: <52D6A48D.4080302@overkiz.com>
Date:	Wed, 15 Jan 2014 16:09:01 +0100
From:	boris brezillon <b.brezillon@...rkiz.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.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

Hello Jason,

On 09/01/2014 18:35, Jason Gunthorpe wrote:
> 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..

Are you suggesting we should provide a function that converts these
modes into a nand_timings struct, or just use the timing modes and
let the NAND controller drivers configure its IP accordingly ?

I found the ONFI timing tables in this document:

www.*onfi*.org/~/media/*ONFI*/specs/*onfi*_3_1_spec.pdf‎ (chapter 4.16).

I suppose my nand_timings struct should use the names described
page 110-111 (at least if we decide to use nand_timings and not
nand_timing_modes), right ?

Best Regards,

Boris

>
> Jason

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