On Mon, Feb 11, 2013 at 3:53 PM, Doug Anderson <dianders@xxxxxxxxxxxx> wrote: > Wolfram, > > On Sun, Feb 10, 2013 at 10:17 AM, Wolfram Sang <w.sang@xxxxxxxxxxxxxx> wrote: >> On Mon, Feb 04, 2013 at 02:33:15PM +0530, Yuvaraj Kumar C D wrote: >>> This RFC patch is w.r.t multimaster bus arbitration which is already >>> being discussing in the mainline. >>> This patch provides hooks for the i2c multimaster bus arbitration >>> and to have the arbitration parameters. >> >> I still haven't understood why the arbitration specified in the I2C >> standard is not enough for you. Or what you would need to make use of >> it. > > At the moment perhaps the strongest argument for why this particular > arbitration scheme is needed is that's what the EC (embedded > controller) on the ARM Chromebook uses. There have been several > arguments in-house about whether this was the most ideal way to > structure things, but that's what we shipped with. Thus, if we want > to be able to talk to i2c devices on this bus (contains the keyboard, > battery, and a bunch of power switches) we need something in the > system that implements this arbitration scheme. > There was some discussion about using the built-in I2C multi-master support but no one had had a good experience getting it to work reliably in a real system so we ended up deciding not to rely on this. > As a side note: I'm trying to code up a quick arbitrator now using the > muxing framework as Grant suggested. I will play with this and post > it if I can get it to work. It's quite short so far. > > -Doug -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
