[PATCH 2/2] i2c: Add generic I2C multiplexer using pinctrl API

[Linus Walleij]

On Tue, Apr 17, 2012 at 8:49 PM, Stephen Warren <swarren at wwwdotorg.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 at nvidia.com>

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