[PATCH v3 1/4] i2c: mux-pinctrl: Rework to honor disabled child nodes

Wolfram Sang wsa at the-dreams.de
Fri Mar 20 03:19:25 PDT 2015

> 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.

Ouch, you are right. The crux of interfaces returning NULL instead of an
ERR_PTR :( I'll have a look, I maybe started to fix this somewhen.

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

I think that makes sense.

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

I will have a closer look to the issue this weekend.

> 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.

Cool, thanks. Learning by doing is a good way to get such knowledge :)

> Unfortunately there is already little of it, so please don't
> expect a quick tested patch.

I understand.



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