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
> --
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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]
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