linux-kernel - Re: [RFC PATCH 1/4] spi: spidev: Add Google SPI flash compatible string

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Message-ID: <20150520114158.GF21577@sirena.org.uk>
Date:	Wed, 20 May 2015 12:41:58 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Olof Johansson <olof@...om.net>,
	Doug Anderson <dianders@...omium.org>,
	David Hendricks <dhendrix@...gle.com>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/4] spi: spidev: Add Google SPI flash compatible
 string

On Wed, May 20, 2015 at 01:21:53PM +0200, Javier Martinez Canillas wrote:

> The ChromeOS user-space just uses flashrom to send a raw stream of bytes
> via spidev to the SPI NOR flash chip. There is drivers/mtd/spi-nor/spi-nor.c
> but AFAIU there are some limitations when interfacing the flash through
> the MTD layer, for example there isn't a way to set the SPI flash write
> protection through MTD. But I'll do some investigation before re-spinning
> the patches.

OK, that's a bit concerning - perhaps what's needed here is to extend
MTD and so on (if only to find some way for it to coexist with spidev
for the time being)?

> BTW, the other "rohm,dh2228fv" compatible string in spidev added by commit
> 8fad805bdc52 ("spi: spidev: Add Rohm DH2228FV DAC compatible string"), also
> does not have a documented DT binding so that should be fixed as well.

wv :)

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