On 3 December 2012 08:24, Viresh Kumar <viresh.kumar@xxxxxxxxxx> wrote: > Add i2c bus recovery infrastructure to i2c adapters as specified in the i2c > protocol Rev. 03 section 3.1.16 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. > > This doesn't support multi-master recovery for now. > > Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx> > --- > V7->V8: > - Clk rate fixed to 100KHz > - Check SCL line to see if it is LOW due to some faults > - removed last use of unlikely() in earlier patch > - Enhanced comment over skip_sda_polling As merge window is shifted for few more days, i am trying another time to get this in 3.8 :) @Paul/Wolfram: Any more comments ? -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
