linux-kernel - Re: [PATCH 2/2] i2c: Add generic I2C multiplexer using pinctrl API

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Date:	Tue, 17 Apr 2012 21:50:02 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Ben Dooks <ben-linux@...ff.org>,
	Wolfram Sang <w.sang@...gutronix.de>,
	devicetree-discuss@...ts.ozlabs.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, Stephen Warren <swarren@...dia.com>
Subject: Re: [PATCH 2/2] i2c: Add generic I2C multiplexer using pinctrl API

On Tue, Apr 17, 2012 at 8:49 PM, Stephen Warren <swarren@...dotorg.org> wrote:

> This is useful for SoCs whose I2C module's signals can be routed to
> different sets of pins at run-time, using the pinctrl API.
>
>                                 +-----+  +-----+
>                                 | dev |  | dev |
>    +------------------------+   +-----+  +-----+
>    | SoC                    |      |        |
>    |                   /----|------+--------+
>    |   +---+   +------+     | child bus A, on first set of pins
>    |   |I2C|---|Pinmux|     |
>    |   +---+   +------+     | child bus B, on second set of pins
>    |                   \----|------+--------+--------+
>    |                        |      |        |        |
>    +------------------------+  +-----+  +-----+  +-----+
>                                | dev |  | dev |  | dev |
>                                +-----+  +-----+  +-----+
>
> Signed-off-by: Stephen Warren <swarren@...dia.com>

I remember you told me about this thing, it's really fascinating!
Acked-by: Linus Walleij <linus.walleij@...aro.org>

> Note: This patch depends on the latest pinctrl tree. In order to merge
> this series into the I2C tree, you'll need to merge the pinctrl tree
> into it first. However, the pinctrl tree doesn't yet have a stable tag/branch
> that you can merge, so this patch can't actually be committed yet.

I'll create a tag once I have the devm* stuff in place (it's so
good we just have to have it).

BTW another way is to have this ACK:ed by Jean/Dooks/Wolfram
and I just put it in the pinctrl tree, unless there is something
radical happening in the mux part of the I2C tree this merge
window?

Yours,
Linus Walleij
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