linux-kernel - Re: [RFC v2 2/4] dt-bindings: i2c: mux: demux-pinctrl: add bindings

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Date:	Wed, 13 Jan 2016 17:07:55 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Wolfram Sang <wsa@...-dreams.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Linux I2C <linux-i2c@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
	Jan Luebbe <jlu@...gutronix.de>
Subject: Re: [RFC v2 2/4] dt-bindings: i2c: mux: demux-pinctrl: add bindings

Hello.

On 01/13/2016 03:52 PM, Wolfram Sang wrote:

>>> These bindings allow an I2C bus to switch between multiple masters. This
>>> is not hot-swichting because connected I2C slaves will be
>>> re-instantiated. It is meant to select the best I2C core at runtime once
>>> the task is known. Example: Prefer i2c-gpio over another I2C core
>>> because of HW errata affetcing your use case.
>>
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/i2c/i2c-demux-pinctrl.txt
>>> @@ -0,0 +1,155 @@
>>
>>> +Here is a snipplet for a bus to be demuxed. It contains various i2c clients for
>>
>> snippet
>>
>>> +HDMI, so the bus is named "i2c-hdmi":
>>> +
>>> +       i2chdmi: i2c@8 {
>>
>> Would it make sense to call the node "i2c-bus@8"?
>
> That sounds like a question for our EPapr expert Sergei (CCed) :)

    ePAPR only mentions "i2c". I'm not sure where the numeric part of the name 
comes from in this case...

[...]

MBR, Sergei