mfd: Add ab8500 version detection and enforcing

There are currently four different versions of the AB8500
around: AB8500, AB8505, AB9540 and AB8540. Unfortunately:

- Some of the chips (AB8500, AB8505, AB9540) cannot read
  the AB8500_REV_REG register but return errors

- Some of them have the same ID value in the hardware
  register AB8500_REV_REV, for example the first versions
  of AB8505 and AB9540 have 0xFF in this register -
  just like the AB8500.

So we need to be able to enforce a certain version from
the platform. We do this by using the id of the platform
device that provides the read/write functions.

Reviewed-by: Mark Brown <[email protected]>
Signed-off-by: Maxime Coquelin <[email protected]>
Signed-off-by: Alex Macro <[email protected]>
Signed-off-by: Michel Jaouen <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Samuel Ortiz <[email protected]>

0 files changed, 0 insertions, 0 deletions