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

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Message-ID: <CAMuHMdUdxk6yjYAr3i7sjdMa-WJxrbOhsEz3JidY9aZVhaoURw@mail.gmail.com>
Date:	Wed, 6 Jan 2016 15:30:39 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Wolfram Sang <wsa@...-dreams.de>
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

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"?
> +
> +               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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