linux-kernel - Re: [PATCH v2] i2c/mux: Driver for PCA9541 I2C Master Selector

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Message-ID: <20101016015829.GA30128@ericsson.com>
Date:	Fri, 15 Oct 2010 18:58:29 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	Jean Delvare <khali@...ux-fr.org>
CC:	Ben Dooks <ben-linux@...ff.org>,
	Rodolfo Giometti <giometti@...ux.it>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] i2c/mux: Driver for PCA9541 I2C Master Selector

On Tue, Oct 12, 2010 at 09:15:16PM -0400, Guenter Roeck wrote:
> This patch adds support for PCA9541, an I2C Bus Master Selector.
> The driver is modeled as single channel I2C Multiplexer to be able to utilize
> the I2C multiplexer framework.
> 
> Signed-off-by: Guenter Roeck <guenter.roeck@...csson.com>
> Reviewed-by: Tom Grennan <tom.grennan@...csson.com>
> ---
> v2 changes:
> - Added more detailed description and reasoning why the driver was implemented
>   as single-channel multiplexer.
> - Modified arbitration algorithm, since access to i2c masters from interrupt
>   level is not a good idea. Instead of using hrtimers and handling arbitration
>   in interrupt, handle it from select_chan and either delay for short retry
>   periods or sleep for long (millisecond) periods.
> 
>  drivers/i2c/muxes/Kconfig   |   10 +
>  drivers/i2c/muxes/Makefile  |    1 +
>  drivers/i2c/muxes/pca9541.c |  397 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 408 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/i2c/muxes/pca9541.c
> 
Any comments / thoughts / feedback ?

Thanks,
Guenter
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