linux-kernel - Re: [PATCH V2] Add support for flag status register on Micron chips.

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Message-ID: <CAFcVECLH432pP_hCZXpbKCrOO_tV9v2ev4kLNzUjro68BnADkA@mail.gmail.com>
Date:	Mon, 14 Apr 2014 21:11:34 +0530
From:	Harini Katakam <harinikatakamlinux@...il.com>
To:	grmoore@...era.com
Cc:	ggrahammoore@...il.com, Marek Vasut <marex@...x.de>,
	Geert Uytterhoeven <geert+renesas@...ux-m68k.org>,
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Jingoo Han <jg1.han@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Yves Vandervennet <rocket.yvanderv@...il.com>,
	linux-mtd@...ts.infradead.org,
	Insop Song <insop.song@...nspeed.com>,
	Alan Tull <atull@...era.com>,
	Sourav Poddar <sourav.poddar@...com>,
	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Dinh Nguyen <dinguyen@...era.com>
Subject: Re: [PATCH V2] Add support for flag status register on Micron chips.

Hi,

On Fri, Apr 11, 2014 at 8:33 PM,  <grmoore@...era.com> wrote:
> From: Graham Moore <grmoore@...era.com>
>
> Some new Micron flash chips require reading the flag
> status register to determine when operations have completed.
>
> Furthermore, chips with multi-die stacks of the 65nm 256Mb QSPI also
> require reading the status register before reading the flag status register.
>
> This patch adds support for the flag status register in the n25q512a1 and n25q00
> Micron QSPI flash chips.
>
> Signed-off-by: Graham Moore <grmoore@...era.com>

<snip>

>  #define INFO(_jedec_id, _ext_id, _sector_size, _n_sectors, _flags)     \
> @@ -941,6 +999,8 @@ static const struct spi_device_id m25p_ids[] = {
>         { "n25q128a13",  INFO(0x20ba18, 0, 64 * 1024,  256, 0) },
>         { "n25q256a",    INFO(0x20ba19, 0, 64 * 1024,  512, SECT_4K) },
>         { "n25q512a",    INFO(0x20bb20, 0, 64 * 1024, 1024, SECT_4K) },
> +       { "n25q512a1",   INFO(0x20ba20, 0, 64 * 1024, 1024, USE_FSR) },
> +       { "n25q00",      INFO(0x20ba21, 0, 64 * 1024, 2048, USE_FSR) },
>

I understand that "n25q512a1" was added to distinguish between
0x20bb20 and 0x20ba20,
which is essentially 1.8V and 3V parts.
(The actual part numbers are n25q512a11 and n25q512a13 respectively)
But USE_FSR is required for both parts.

Sorry for posting this question here but it seemed relevant:
When such devices differ only in supply voltages (and return different
response to READ ID),
which we don't act on, is there a way to use the same string?

Regards,
Harini
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