Hi Frank, On Thursday 17 April 2014 13:54:44 Frank Bormann wrote: > Hi Laurent, > > I have a pca9546 on one of my i2c buses. This will create four mux buses in > Linux. One of those mux buses then has a pca9542 connected to it, creating > another two mux buses on top of the first ones. > > The 3.8 kernel, I was initially using enumerated, this as: > > pca9546: 3, 4, 5, 6 > pca9542: 7, 8 > > However, the new 3.12 kernel, I am using now, has changed that enumeration > to: > > pca9546: 3, 4, 7, 8 > pca9542: 5, 6 > > As you may imagine, the pca9542 is connected to bus 4. Apparently, > previously, it would finish the initalization of pca9546 before dealing > with the pca9542. Now it seems to do the pca9542 initialization as soon as > it sees it on mux bus 4. My application however expects the pca9546 buses > to be on incremental bus numbers. I understand that the bus numbers changed, but you still haven't explain *why* you need to have fixed bus numbers. Why do you need to know the bus number at all ? -- Regards, Laurent Pinchart -- 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
