[PATCH V3 0/2] ARM: OMAP3+: support cpufreq-cpu0 for device tree boot

[Nishanth Menon <nm@ti.com>]

The following version 3 of the series arose from trying to use BeagleBoard-XM
(OMAP3 variant) for doing CPU DVFS using cpufreq-cpu0. This series enables the
generic cpufreq-cpu0 driver to be used in device tree enabled boot while
maintaining support of the legacy omap-cpufreq driver when used in non device
tree enabled boot.

However, in order to enable complete SoC entitlement for OMAP platforms, with
this series, key features are still pending on device tree adaptation for OMAP:
A) clock framework data transition to DT - this should happen soon, so this
series hacks the clock node for the time being as suggested in review of
original series[1].
B) On processors that use voltage controller, voltage processor (VC/VP hardware
loop using I2C_SR path) - we have started work on transitioning them to
regulator framework driven by DT.
C) Adaptive Body Bias and SmartReflex AVS conversion to DT. [2]

Note: At this point in time, we do not have DT entries for clock on OMAP
platforms. Common Clock Framework(CCF) could also control regulators[3].
Once these conversions are complete, there might be minimal cleanup work to
switch to the new data structure changes.

Key benefit of the series is to allow all relevant TI platforms now to use a
single cpufreq driver and equivalent frameworks in addition be part of the
transition to device tree.
NOTE: As a result of this series:
1. omap-cpufreq will be used only in non device tree boot scenario. we should
   delete this driver once the 100% DT conversion is complete.
2. Generic cpufreq-cpu0 will be used only in device tree boot scenario.
   boot systems.

Key changes in version 3:
	- series now rebased on Device tree patches queued for OMAP 3.10
	- DT patches introducing OPPs are now merged, so pending patches alone
	  are part of the new series.
	- omap-cpufreq is now converted to platform_device to address:
		http://marc.info/?t=136434901900001&r=1&w=2

version 2 of the series:
	http://marc.info/?t=136371570200003&r=1&w=2
	available at:
	https://github.com/nmenon/linux-2.6-playground/commits/push/cpufreq-cpu0-omap-all-v2

version 1 of the series:
	http://marc.info/?t=136329485400005&r=1&w=2
	available at:
	https://github.com/nmenon/linux-2.6-playground/commits/push/cpufreq-cpu0-omap-all-v1

[1] Original discussion thread which triggered this series:
	http://marc.info/?l=linux-pm&m=136304313700602&w=2
	https://patchwork.kernel.org/patch/2251841/
	https://patchwork.kernel.org/patch/2251851/
[2] ABB RFC: http://marc.info/?l=linux-omap&m=136449099409794&w=2 
[3] CCF DVFS patches:
https://patchwork.kernel.org/patch/2195431/
https://patchwork.kernel.org/patch/2195421/
https://patchwork.kernel.org/patch/2195451/
https://patchwork.kernel.org/patch/2195441/
https://patchwork.kernel.org/patch/2195461/

Version 3 is now based on for-3.10/dts branch from Benoit:
	http://git.kernel.org/cgit/linux/kernel/git/bcousson/linux-omap-dt.git/log/?h=for_3.10/dts
	d114294 ARM: dts: AM33XX: Corrects typo in interrupt field in SPI node

Version 3 is also available at:
	https://github.com/nmenon/linux-2.6-playground/commits/push/cpufreq-cpu0-omap-all-v3
	git link: git://github.com/nmenon/linux-2.6-playground.git
	branch: cpufreq-cpu0-omap-all-v3

Test coverage:
	test script: http://pastebin.com/zrr8ptge
Platforms verified:
	beaglebone(rev A6a) - AM33xx compatible - http://pastebin.com/GVP2wDVr
	beagleboard (rev C1D) - OMAP3430 compatible
		- DT enabled boot: http://pastebin.com/2AY1F5Qa
		- No DT enabled boot: http://pastebin.com/hDk0gbpU
	omap3-beagle-xm -OMAP3630 compatible - http://pastebin.com/5tHAQcLZ
	Pandaboard -(OMAP4430 ES2.2) - http://pastebin.com/6D9aDPXT
	Pandaboard-ES -(OMAP4460 ES1.1) - http://pastebin.com/ExrBEczr

Nishanth Menon (2):
  ARM: OMAP3+: use cpu0-cpufreq driver in device tree supported boot
  cpufreq: OMAP: instantiate omap-cpufreq as a platform_driver

 arch/arm/mach-omap2/board-generic.c   |    5 +++++
 arch/arm/mach-omap2/cclock33xx_data.c |    2 +-
 arch/arm/mach-omap2/cclock3xxx_data.c |    3 ++-
 arch/arm/mach-omap2/cclock44xx_data.c |    3 ++-
 arch/arm/mach-omap2/pm.c              |    9 +++++++++
 drivers/cpufreq/omap-cpufreq.c        |   19 ++++++++++++++-----
 6 files changed, 33 insertions(+), 8 deletions(-)

Cc: Kevin Hilman <khilman@linaro.org>
Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: "Benoît Cousson" <b-cousson@ti.com>
Cc: Jon Hunter <jon-hunter@ti.com>
Cc: Keerthy <j-keerthy@ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Shawn Guo <shawn.guo@linaro.org>

Regards,
Nishanth Menon
-- 
1.7.9.5

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