Hello Wolfgang,
Wolfgang Denk wrote:
Dear ksi@koi8.net,
In message Pine.LNX.4.64ksi.0902191141090.18501@home-gw.koi8.net you wrote:
[...]
That means you'll have to rewrite the entire U-Boot. 99% of the boards have only one bus so they did not switch busses. That means they never called that i2c_set_bus_num() relying on i2c_init() in libxxx/board.c instead.
I cannot follow your argument.
Yes, the status quo is as you describe, it relies on i2c_init() and is simple-minded and does not support an arbitry number of arbitrarily complex I2C bus trees and multiplexors and expanders and what else. But it was sufficient for the first 10 years and 500 boards of U-Boot development.
Now we are discussion a major redesign, so what is the big problem of changing this part? "rewrite the entire U-Boot"? Please stay serious. Compared to the other changes you suggest, this is not that big a part.
I think so too.
bye Heiko