[PATCH V3 0/4] AT91: replace broken TWI driver i2c-at91.c

Nikolaus Voss
2011-11-08T14:15:48Z

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.

V3: Integrated review comments from Ryan Mallon and Felipe Balbi
V2: Fixed whitespace issue

Nikolaus Voss (4):
drivers/i2c/busses/i2c-at91.c: remove broken driver
drivers/i2c/busses/i2c-at91.c: add new driver
G45 TWI: remove open drain setting for twi function gpios
Add lookup entries for twi_clk for devices with more than one TWI
port

arch/arm/mach-at91/at91sam9g45.c | 2 +
arch/arm/mach-at91/at91sam9g45_devices.c | 6 -
arch/arm/mach-at91/at91sam9rl.c | 2 +
drivers/i2c/busses/Kconfig | 11 +-
drivers/i2c/busses/i2c-at91.c | 453 +++++++++++++++++++-----------
5 files changed, 292 insertions(+), 182 deletions(-)

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1.7.5.4