10 Sep, 2010

1 commit

• 5affb6077   gpio: sx150x: correct and refine reset-on-probe behavior ... Browse Code »

  Replace the arbitrary software-reset call from the device-probe
  method, because:

  - It is defective. To work correctly, it should be two byte writes,
  not a single word write. As it stands, it does nothing.

  - Some devices with sx150x expanders installed have their NRESET pins
  ganged on the same line, so resetting one causes the others to reset -
  not a nice thing to do arbitrarily!

  - The probe, usually taking place at boot, implies a recent hard-reset,
  so a software reset at this point is just a waste of energy anyway.

  Therefore, make it optional, defaulting to off, as this will match the
  common case of probing at powerup and also matches the current broken
  no-op behavior.

  Signed-off-by: Gregory Bean
  Reviewed-by: Jean Delvare
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Gregory Bean

  2010-09-10 09:57:24 +0800  

11 Aug, 2010

1 commit

• c34f16b70   gpio: sx150x: add Semtech I2C sx150x gpio expander driver ... Browse Code »

  Add support for Semtech SX150-series I2C GPIO expanders. Compatible
  models include:

  8 bits: sx1508q
  16 bits: sx1509q

  Signed-off-by: Gregory Bean
  Cc: David Brownell
  Cc: Jean Delvare
  Cc: Trilok Soni
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Gregory Bean

  2010-08-11 23:59:09 +0800