From: Ben Dooks <ben-i2c-elnMNo+KYs3YtjvyW6yDsg@public.gmane.org>
To: Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
Cc: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
"Richard Röjfors"
<richard.rojfors-gfIc91nka+FZroRs9YW3xA@public.gmane.org>,
"Ben Dooks" <ben-linux-elnMNo+KYs3YtjvyW6yDsg@public.gmane.org>,
info-l7gf1WXxx3uGw+nKnLezzg@public.gmane.org,
"Michael Lawnick" <ml.lawnick-Mmb7MZpHnFY@public.gmane.org>,
"Jean Delvare" <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>,
"Rodolfo Giometti" <giometti-k2GhghHVRtY@public.gmane.org>
Subject: Re: Xilinx iic i2c bus interface GPIO support for i2c-mux in Linux.
Date: Mon, 13 Feb 2012 23:12:13 +0000 [thread overview]
Message-ID: <20120213231212.GD2999@freya.fluff.org> (raw)
In-Reply-To: <20120208194615.GT14907-sJ/iWh9BUns@public.gmane.org>
On Wed, Feb 08, 2012 at 01:46:15PM -0600, Robin Holt wrote:
> We are using a Xilinx FPGA which implements a series of i2c bus
> interfaces. We are planning on implementing a single-bit GPIO
> (XIIC_GPO_REG_OFFSET) which is included in that logic block to act
> as a MUX selector (also in the FPGA) between two separate i2c busses.
>
> This will require a GPIO driver in the linux kernel.
There's already a general purpose GPIO driver so that should not be a
problem.
> Is it better to try and change the i2c-xiic.c code which already knows
> about the GPO register to handle that additional GPIO or should we be
> implementing the GPIO driver outside the i2c driver and then use the
> standard i2c-mux support available in newer kernels?
My feelings would be to try and use the standard i2c-mux support if
possible.
> Any guidance is welcome.
>
> Thanks,
> Robin Holt
> --
> To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
prev parent reply other threads:[~2012-02-13 23:12 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-08 19:46 Xilinx iic i2c bus interface GPIO support for i2c-mux in Linux Robin Holt
[not found] ` <20120208194615.GT14907-sJ/iWh9BUns@public.gmane.org>
2012-02-08 19:54 ` Jean Delvare
[not found] ` <20120208205429.672c9092-R0o5gVi9kd7kN2dkZ6Wm7A@public.gmane.org>
2012-02-08 20:02 ` Robin Holt
[not found] ` <20120208200206.GW14907-sJ/iWh9BUns@public.gmane.org>
2012-02-08 20:47 ` Jean Delvare
2012-02-13 23:12 ` Ben Dooks [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20120213231212.GD2999@freya.fluff.org \
--to=ben-i2c-elnmno+kys3ytjvyw6ydsg@public.gmane.org \
--cc=ben-linux-elnMNo+KYs3YtjvyW6yDsg@public.gmane.org \
--cc=giometti-k2GhghHVRtY@public.gmane.org \
--cc=holt-sJ/iWh9BUns@public.gmane.org \
--cc=info-l7gf1WXxx3uGw+nKnLezzg@public.gmane.org \
--cc=khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org \
--cc=linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=ml.lawnick-Mmb7MZpHnFY@public.gmane.org \
--cc=richard.rojfors-gfIc91nka+FZroRs9YW3xA@public.gmane.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.