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

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Message-ID: <20160113125227.GD1540@katana>
Date:	Wed, 13 Jan 2016 13:52:27 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	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>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: Re: [RFC v2 2/4] dt-bindings: i2c: mux: demux-pinctrl: add bindings

On Wed, Jan 06, 2016 at 03:30:39PM +0100, Geert Uytterhoeven wrote:
> Hi Wolfram,
> 
> On Wed, Jan 6, 2016 at 2:51 PM, Wolfram Sang <wsa@...-dreams.de> 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) :)

> > +
> > +               compatible = "i2c-demux-pinctrl";
> > +               i2c-parent = <&gpioi2c>, <&iic2>, <&i2c2>;
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds

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