[PATCH v2 1/2] regulator: act8945a: add regulator driver for ACT8945A

Peter Korsgaard peter at korsgaard.com
Thu Jan 14 03:43:00 PST 2016

>>>>> "Yang," == Yang, Wenyou <Wenyou.Yang at atmel.com> writes:


 >>> Isn't the regulator part of the act8945a identical to act8865? Can't we just use
 >>> the existing act8865-regulator.c driver? (E.G. support 8865 variant in the mfd
 >>> driver, but only register the regulator sub device?)
 >> > Yes, the regulator part of the act8945a is identical to act8865.
 >> > But the act8865-regulator driver is a struct i2c_driver, and the mfd  > sub-
 >> device driver is a platform_driver driver, it is not easy to use  > it.
 >> But the mfd driver could support the act8865 variant as well (by only registering
 >> the regulator mfd cell).

 > I still don't understand.

 > The MFD sub device is registered as a platform device, the existing
 > act8865 driver is registered as an i2c_driver. How do they match? :)

 > Could you point out which exiting driver for me to reference.  Thank you!

What I'm saying is that it isn't nice that we end up with both
act8865-regulator.c and act8954-regulator.c doing 95% the same. This can
either be fixed by:

- Adding act8865 support to your mfd driver (but only registering the
  regulator subdev for act8865) and changing the existing
  act8865-regulator driver to work as a mfd subdev (platform device)

- Extending the act8865-regulator driver to register as a platform
  driver in ADDITION to a i2c driver so it can be used with mfd. The
  driver already uses regmap so it should only be a matter of adding the
  pdev probe/remove functions.

Venlig hilsen,
Peter Korsgaard 

More information about the linux-arm-kernel mailing list