On 19.03.2015 17:02, Wolfram Sang wrote:

quoted

Perhaps better would be to have a mux-specific function to iterate over a
mux's child nodes and instantiate buses for those. That function would check
whether each bus node was disabled or not. That'd isolate the special case
into the place where it was relevant.

... so I wonder what you think about putting the
of_device_is_available() check into i2c_add_mux_adapter() once the
reg-property and chan_id have been matched?

Ok, I see what you mean. I had a look at the place in question and
wonder what to return from i2c_add_mux_adapter() in the disabled
case so that i2c-mux-pinctrl is still happy with the returned value.

I guess what you want to have is that i2c_add_adapter() is not called
for the disabled case, right?

Is the i2c_adapter struct prepared in i2c_mux_add_adapter() still valid
if i2c_add_adapter() is not called?

Sorry, I am not too deep into i2c subsystem, I just reworked i2c-mux-
pinctrl to make it work on Dove. If you are fine with giving me some
guidance how you prefer to have it done, I can try to free some spare
time. Unfortunately there is already little of it, so please don't
expect a quick tested patch.

Sebastian