Re: [PATCH V4 1/2] i2c/adapter: Add bus recovery infrastructure

[Viresh Kumar <viresh.kumar-qxv4g6HH51o@public.gmane.org>]

On 5/4/2012 3:10 PM, Viresh KUMAR wrote:
> Add i2c bus recovery infrastructure to i2c adapters as specified in the i2c
> protocol Rev. 03 section 3.16 titled "Bus clear".
> 
> http://www.nxp.com/documents/user_manual/UM10204.pdf
> 
> Sometimes during operation i2c bus hangs and we need to give dummy clocks to
> slave device to start the transfer again. Now we may have capability in the bus
> controller to generate these clocks or platform may have gpio pins which can be
> toggled to generate dummy clocks. This patch supports both.
> 
> This patch also adds in generic bus recovery routines gpio or scl line based
> which can be used by bus controller. In addition controller driver may provide
> its own version of the bus recovery routine.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar-qxv4g6HH51o@public.gmane.org>
> ---
>  Documentation/i2c/bus-recovery |   87 ++++++++++++++++++++++
>  drivers/i2c/i2c-core.c         |  160 ++++++++++++++++++++++++++++++++++++++++
>  drivers/i2c/i2c-mux.c          |    9 ++-
>  include/linux/i2c.h            |   58 ++++++++++++++
>  4 files changed, 313 insertions(+), 1 deletions(-)
>  create mode 100644 Documentation/i2c/bus-recovery

Hi Wolfram,

Any inputs on this patch.

--
viresh