linux.git/drivers/i2c, branch v3.0-rc6

i2c/pca954x: Initialize the mux to disconnected state

2011-06-29T09:36:11+00:00

pca954x power-on default is channel 0 connected. If multiple pca954x
muxes are connected to the same physical I2C bus, the parent bus will
see channel 0 devices behind both muxes by default. This is bad.

Scenario:
            -- pca954x @ 0x70 -- ch 0 (I2C-bus-101) -- EEPROM @ 0x50
            |
I2C-bus-1 ---
            |
            -- pca954x @ 0x71 -- ch 0 (I2C-bus-111) -- EEPROM @ 0x50

1. Load I2C bus driver: creates I2C-bus-1
2. Load pca954x driver: creates virtual I2C-bus-101 and I2C-bus-111
3. Load eeprom driver
4. Try to read EEPROM @ 0x50 on I2C-bus-101. The transaction will also bleed
   onto I2C-bus-111 because pca954x @ 0x71 channel 0 is connected by default.

Fix: Initialize pca954x to disconnected state in pca954x_probe()

Signed-off-by: Petri Gynther 
Signed-off-by: Jean Delvare 
Cc: stable@kernel.org

i2c-taos-evm: Fix log messages

2011-06-29T09:36:10+00:00

* Print all error and information messages even when debugging is
  disabled.
* Don't use adapter device to log messages before it is ready.

Signed-off-by: Jean Delvare 
Cc: stable@kernel.org

mfd: Use mfd cell platform_data for timberdale cells platform bits

2011-05-26T17:45:05+00:00

With the addition of a device platform mfd_cell pointer, MFD drivers
can go back to passing platform data back to their sub drivers.
This allows for an mfd_cell->mfd_data removal and thus keep the
sub drivers MFD agnostic. This is mostly needed for non MFD aware
sub drivers.

Acked-by: Richard Röjfors 
Signed-off-by: Samuel Ortiz

Merge branch 'for-linus/2640/i2c' of git://git.fluff.org/bjdooks/linux

2011-05-24T23:39:23+00:00

* 'for-linus/2640/i2c' of git://git.fluff.org/bjdooks/linux: (21 commits)
  mach-ux500: set proper I2C platform data from MOP500s
  i2c-nomadik: break out single messsage transmission
  i2c-nomadik: reset the hw after status check
  i2c-nomadik: remove the unnecessary delay
  i2c-nomadik: change the TX and RX threshold
  i2c-nomadik: add code to retry on timeout failure
  i2c-nomadik: use pm_runtime API
  i2c-nomadik: print abort cause only on abort tag
  i2c-nomadik: correct adapter timeout initialization
  i2c-nomadik: remove the redundant error message
  i2c-nomadik: corrrect returned error numbers
  i2c-nomadik: fix speed enumerator
  i2c-nomadik: make i2c timeout specific per i2c bus
  i2c-nomadik: add regulator support
  i2c: i2c-sh_mobile bus speed platform data V2
  i2c: i2c-sh_mobile clock string removal
  i2c-eg20t: Support new device ML7223 IOH
  i2c: tegra: Add de-bounce cycles.
  i2c: tegra: fix repeated start handling
  i2c: tegra: recover from spurious interrupt storm
  ...

Merge branches 'for-2639/i2c-eg20t', 'for-2639/i2c-shmobile', 'for-2639/i2c-tegra' and 'for-2639/i2c-nomadik2' into for-linus/2640/i2c

2011-05-24T23:25:55+00:00

i2c-nomadik: break out single messsage transmission

2011-05-24T23:20:58+00:00

Reduce code size in the message transfer function by factoring out
a single-message transfer function.

Signed-off-by: Linus Walleij 
Signed-off-by: Ben Dooks

i2c-nomadik: reset the hw after status check

2011-05-24T23:20:54+00:00

In case of I2C timeout, reset the HW only after the HW status
is read, otherwise the staus will be lost.

Signed-off-by: Virupax Sadashivpetimath 
Reviewed-by: Jonas Aberg 
Reviewed-by: Srinidhi Kasagar 
Signed-off-by: Linus Walleij 
Signed-off-by: Ben Dooks

i2c-nomadik: remove the unnecessary delay

2011-05-24T23:20:50+00:00

The delay in the driver seems to be not needed, so remove it.

Signed-off-by: Virupax Sadashivpetimath 
Reviewed-by: Markus Grape 
Tested-by: Per Persson 
Tested-by: Chethan Krishna N 
Reviewed-by: Srinidhi Kasagar 
Signed-off-by: Linus Walleij 
Signed-off-by: Ben Dooks

i2c-nomadik: change the TX and RX threshold

2011-05-24T23:20:47+00:00

1) Increase RX FIFO threshold so that there is a reduction in
the number of interrupts handled to complete a transaction.

2) Fill TX FIFO in the write function.

Signed-off-by: Virupax Sadashivpetimath 
Reviewed-by: Jonas Aberg 
Signed-off-by: Linus Walleij 
Signed-off-by: Ben Dooks

i2c-nomadik: add code to retry on timeout failure

2011-05-24T23:20:43+00:00

It is seen that i2c-nomadik controller randomly stops generating the
interrupts leading to a i2c timeout. As a workaround to this problem,
add retries to the on going transfer on failure.

Signed-off-by: Virupax Sadashivpetimath 
Reviewed-by: Jonas ABERG 
Signed-off-by: Linus Walleij 
Signed-off-by: Ben Dooks