[PATCH 0/3] make stmp-style devices mach-independent

[w.sang@pengutronix.de (Wolfram Sang)]

It seems I haven't been following the lists too closely lately, so I might have
missed similar patches. Yet, I noticed some patches dealing with drivers using
mxs-specific features, so they need to include mach-specific files which is
troublesome. I started to address the problem as well some time ago, so I push
out the patches now as RFC to enrich the discussion. The patches are rebased to
linux 3.2-rc2 and are boot tested.

The basics: mach-mxs uses ip-cores which follow a register layout I have
first seen on STMP SoCs. That means, every register has four incarnations:
 - one u32 to store a value
 - a SET register where every 1-bit sets the corresponding bit,
   others are unaffected
 - similar with a CLR register
 - and a TGL (toggle) register

Also, the 2 MSBs in register 0 are always the same and can be used to reset the
block.

All this is strictly speaking not mach-specific (but ip-core specific) and,
thus, doesn't need to be in mach-mxs/include. As I have been told, mx50 and
mx6(?) might also use IP cores following the STMP-style; so I wondered if it
can't be exported like the following patch series does:

Introduce a stmp-style device, put the code around that in a public place
(currently drivers/base/; dunno if that is the best place, though), and let
drivers for stmp-style devices select that code.

Voila, mach dependency gone, reusable code introduced. Note that I didn't
remove the duplicated code from mach-mxs yet, first all drivers have to be
converted.

Right thing to do? If so, I'll repost properly to the right lists. Fishing for
feedback right now :)

Thanks,

   Wolfram

Wolfram Sang (3):
  drivers: base: add support for stmp-style devices
  i2c: mxs: use global reset function
  rtc: stmp3xxx: use global stmp_device functionality

 drivers/base/Kconfig         |    3 ++
 drivers/base/Makefile        |    1 +
 drivers/base/stmp_device.c   |   80 ++++++++++++++++++++++++++++++++++++++++++
 drivers/i2c/busses/Kconfig   |    1 +
 drivers/i2c/busses/i2c-mxs.c |    9 +----
 drivers/rtc/Kconfig          |    1 +
 drivers/rtc/rtc-stmp3xxx.c   |   29 +++++----------
 include/linux/stmp_device.h  |   19 ++++++++++
 8 files changed, 117 insertions(+), 26 deletions(-)
 create mode 100644 drivers/base/stmp_device.c
 create mode 100644 include/linux/stmp_device.h

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1.7.7.1