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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 19 May 2015 22:53:05 +0300
From:	Baruch Siach <baruch@...s.co.il>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Mark Brown <broonie@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	Doug Anderson <dianders@...omium.org>,
	linux-kernel@...r.kernel.org, Kukjin Kim <kgene@...nel.org>,
	Olof Johansson <olof@...om.net>,
	David Hendricks <dhendrix@...gle.com>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [RFC PATCH 1/4] spi: spidev: Add Google SPI flash compatible
 string

Hi Javier,

On Tue, May 19, 2015 at 03:34:11PM +0200, Javier Martinez Canillas wrote:
> Google Chromebooks have a SPI flash that is used to store firmware and
> different system parameters and data (i.e: Google Binary Block flags).
> 
> Since there isn't a driver for it yet, the spidev interface is used to
> access the flash from user-space (i.e: using the flashrom tool).
> 
> Add a "google,spi-flash" compatible string so the Device Tree sources
> use it instead of the "spidev" compatible which does not describe the
> real HW and is just a Linux implementation detail.
> 
> A generic "google,spi-flash" OF device ID is used instead of the actual
> vendor/model because these chips are commodity parts that are sourced
> from multiple vendors. So specifying the exact vendor and model in the
> DTS will add a maintenance burden with no real gain (the parts are 100%
> compatible anyways) and will likely result in it simply being wrong for
> a sizeable fraction of the machines.

The compatible string and dt binding should be documented somewhere under 
Documentation/devicetree/bindings/. Also, please keep the dt list on Cc for dt 
related patches.

baruch

-- 
     http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
   - baruch@...s.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/