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

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Date:	Fri, 20 Mar 2015 11:19:25 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Gabriel Dobato <dobatog@...il.com>, linux-i2c@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/4] i2c: mux-pinctrl: Rework to honor disabled child
 nodes


> 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.

Thanks,

   Wolfram


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