Viresh Kumar wrote:
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 ?
OK by me
Reviewed-by: Paul Carpenter <paul@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
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