linux-kernel - Re: [PATCH v6 4/4] i2c, i2c

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Message-ID: <20140221153239.20dbb8c2@alan.etchedpixels.co.uk>
Date:	Fri, 21 Feb 2014 15:32:39 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	Jean Delvare <khali@...ux-fr.org>,
	Guenter Roeck <linux@...ck-us.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Rui Wang <ruiv.wang@...il.com>
Subject: Re: [PATCH v6 4/4] i2c, i2c_imc: Add DIMM bus code

> I'm suggesting identifying a range of addresses on a bus with a "port"
> (or whatever it should be called).  Multiple ports could claim
> non-overlapping ranges on the same bus.

Which is fine until you meant a mux or a device that can be moved about
by writing to it, or has a wide range of addresses determined by
strapping.

> In this particular case (Intel LGA2011 systems), there's only one sane
> way to wire up the busses, since the memory controller *is* the smbus
> master.  According to the JEDEC spec, each DIMM slot is has three pins

Ok that helps a lot for the specific case, and you have at least in
theory got a flag between the OS and BIOS to avoid things like SMM
throwing parties on the smbus while you are using it.

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