[BUG] omap: mfd/regulator: twl/core: init order

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Hi

 while testing an omap3 board with device tree support I stumbled upon a
bug which is due to wrong initialization order of twl-core and
twl-regulator (I suppose): In the boot process they get loaded way too
late so that a lot of drivers before where configured wrong or just
refuse to load.

For example the real time clock driver: The RTC kicks in way before
twl_probe() and due to that it configures its register map wrong
(at this time twl_priv->twl_id isn't configured yet).

Another example is the omap display subsystem. It (DSS) fails loading
while trying to register some not yet existent regulators and because it
lacks EPROBE_DEFER.

USB and MMC is also not working and I'm suspicious of the same cause.

Any ideas?

 Thanks
  -- Christoph

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