linux-kernel - Re: [RFC 02/47] mtd: nand: add ONFI NAND Timing Mode Specifications

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Message-ID: <20140325170102.GC30641@obsidianresearch.com>
Date:	Tue, 25 Mar 2014 11:01:02 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	angus.clark@...com, kernel@...inux.com,
	linux-mtd@...ts.infradead.org, pekon@...com,
	computersforpeace@...il.com, dwmw2@...radead.org,
	Boris BREZILLON <b.brezillon.dev@...il.com>
Subject: Re: [RFC 02/47] mtd: nand: add ONFI NAND Timing Mode Specifications

On Tue, Mar 25, 2014 at 08:19:19AM +0000, Lee Jones wrote:
> This patch adds a new structure, 'nand_timing_spec', to capture the A/C
> timing characteristics of NAND devices.

Boris BREZILLON <b.brezillon.dev@...il.com> has been working on a
similar patch for a time now, and I think has an implementation for
the sunxi driver.
 
> some of the major NAND manufacturers (e.g. Samsung, Toshiba). Here we
> have followed broadly the ONFI timing definitions.

Timing specifications that are not precisely defined are
useless.. I would stick entirely with the well defined ONFI ones
until a need arises..

> + * Note, 'tR' field (maximum page read time) is extracted from the ONFI
> + * parameter page during device probe.
> + */
> +struct nand_timing_spec nand_onfi_timing_specs[] = {

const?

> +	/*
> +	 * ONFI Timing Mode '0' (supported on all ONFI compliant devices)
> +	 */
> +	[0] = {
> +		.tCLS	= 50,
> +		.tCS	= 70,
> +		.tALS	= 50,

Use picoseconds, ns is already loosing precision at the higher timing
modes.

Cheers,
Jason
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