[PATCH v11 0/4] AT91: replace old i2c-at91.c TWI driver

Hi Nikolaus,

Le 08/29/2012 09:28 AM, Nikolaus Voss a ?crit :

The old driver has two main deficencies:
i)  No repeated start (Sr) condiction is possible, this makes it unusable
     e.g. for most SMBus transfers.
ii) I/O was done with polling/busy waiting what caused over-/underruns
     even at light system loads and clock speeds.

The new driver overcomes these deficencies and in addition allows for
more than one TWI interface.

A remaining limitation is the fact, that only one repeated start is
possible (two concatenated messages). This limitation is imposed by
the hardware. However, this should not be a problem as all common
i2c-client communication does not rely on more than one repeated start.

Changes since v11:
- corrected wrong id_entry on sam9261 twi gpio pdev

Thanks for this new version, you can add
Tested-By: Ludovic Desroches <redacted>
for the whole series.

Concerning the open drain issue, even if I don't have it on my board 
your patch is correct it is needed also for chips. Once I'll have the 
complete list, I'll send an additional patch.

Regards

Ludovic

Nikolaus Voss (4):
   drivers/i2c/busses/i2c-at91.c: remove old polling driver
   Replace clk_lookup.con_id with clk_lookup.dev_id entries for twi clk
   drivers/i2c/busses/i2c-at91.c: add new driver
   G45 TWI: remove open drain setting for twi function gpios

  arch/arm/mach-at91/at91rm9200.c            |    1 +
  arch/arm/mach-at91/at91rm9200_devices.c    |    9 +
  arch/arm/mach-at91/at91sam9260.c           |    1 +
  arch/arm/mach-at91/at91sam9261.c           |    1 +
  arch/arm/mach-at91/at91sam9261_devices.c   |    9 +
  arch/arm/mach-at91/at91sam9263.c           |    1 +
  arch/arm/mach-at91/at91sam9g45.c           |    2 +
  arch/arm/mach-at91/at91sam9g45_devices.c   |    6 -
  arch/arm/mach-at91/at91sam9rl.c            |    2 +
  arch/arm/mach-at91/at91sam9x5.c            |    3 +
  arch/arm/mach-at91/include/mach/at91_twi.h |   68 ----
  drivers/i2c/busses/Kconfig                 |   11 +-
  drivers/i2c/busses/i2c-at91.c              |  591 ++++++++++++++++++----------
  13 files changed, 418 insertions(+), 287 deletions(-)
  delete mode 100644 arch/arm/mach-at91/include/mach/at91_twi.h