[PATCH V2 0/8] ARM: OMAP3+: support cpufreq-cpu0 for device tree boot

[Nishanth Menon <nm@ti.com>]

Hi,
The following version 2 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.

As a result of these pending features:
- OMAP4 TWL6030 and TPS62361 which set voltage ONLY over I2C_SR have no
regulators associated at the moment - fortunately, we boot at highest voltage,
so things still work.
- Missing ABB and AVS implies that for few of the SoCs (3630, OMAP4), I have
not added those OPPs in DT yet - this also needs alignment with iMX, AM series
pending work, where certain OPPs need enabling based on efuse programmed
bit sequences - since it is an add-on work, it is not addressed here.

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[2].
Once these conversions are complete, there will 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 2:
	- series now rebased on Device tree patches queued for OMAP 3.10
	- cpufreq-cpu0 and omap_cpufreq will co-exist and used depending on
	  usage of device tree.
	- minor wording, cleanups for the same.
	- omap3.dtsi and omap4.dtsi now become common dtsi which is used by
	  omap34xx.dtsi, omap36xx.dtsi, omap443x.dtsi, omap4460.dtsi as needed.

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] 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 2 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
	44fab7a ARM: dts: omap3-devkit8000: Add NAND DT node

Version 2 is also available at:
	https://github.com/nmenon/linux-2.6-playground/commits/push/cpufreq-cpu0-omap-all-v2
	git link: git://github.com/nmenon/linux-2.6-playground.git
	branch: cpufreq-cpu0-omap-all-v2

Test coverage:
	test script: http://pastebin.com/zrr8ptge
Platforms verified:
	beaglebone(rev A6a) - AM33xx compatible - http://pastebin.com/PUx5h6Jy
	beagleboard (rev C1D) - OMAP3430 compatible - http://pastebin.com/SycCinFb (DT) http://pastebin.com/qwJHw9Ev (no DT)
	omap3-beagle-xm -OMAP3630 compatible - http://pastebin.com/tVEXeVZC
	Pandaboard -(OMAP4430 ES2.2) verified with omapconf - http://pastebin.com/cAtytfW0
	Pandaboard-ES -(OMAP4460 ES1.1) verified with omapconf - http://pastebin.com/3EymNTMp

Nishanth Menon (8):
  ARM: dts: OMAP34xx/35xx: Add CPU OPP table
  ARM: dts: OMAP36xx: Add CPU OPP table
  ARM: dts: OMAP3: use twl4030 vdd1 regulator for CPU
  ARM: dts: OMAP443x: Add CPU OPP table
  ARM: dts: omap4-panda: move generic sections to panda-common
  ARM: dts: OMAP4460: Add CPU OPP table
  ARM: OMAP3+: use cpu0-cpufreq driver in device tree supported boot
  cpufreq: OMAP: donot allow to be used with device tree

 arch/arm/boot/dts/am3517-evm.dts          |    2 +-
 arch/arm/boot/dts/am3517_mt_ventoux.dts   |    2 +-
 arch/arm/boot/dts/omap3-beagle-xm.dts     |    6 +
 arch/arm/boot/dts/omap3-beagle.dts        |    8 +-
 arch/arm/boot/dts/omap3-devkit8000.dts    |    2 +-
 arch/arm/boot/dts/omap3-evm.dts           |    8 +-
 arch/arm/boot/dts/omap3-igep.dtsi         |    2 +-
 arch/arm/boot/dts/omap3-overo.dtsi        |    2 +-
 arch/arm/boot/dts/omap3430-sdp.dts        |    2 +-
 arch/arm/boot/dts/omap34xx.dtsi           |   28 ++++
 arch/arm/boot/dts/omap36xx.dtsi           |   13 ++
 arch/arm/boot/dts/omap4-panda-a4.dts      |    5 +-
 arch/arm/boot/dts/omap4-panda-common.dtsi |  251 +++++++++++++++++++++++++++++
 arch/arm/boot/dts/omap4-panda-es.dts      |    3 +-
 arch/arm/boot/dts/omap4-panda.dts         |  247 +---------------------------
 arch/arm/boot/dts/omap4-sdp.dts           |    2 +-
 arch/arm/boot/dts/omap4-var-som.dts       |    2 +-
 arch/arm/boot/dts/omap443x.dtsi           |   27 ++++
 arch/arm/boot/dts/omap4460.dtsi           |   14 ++
 arch/arm/boot/dts/twl4030.dtsi            |    6 +
 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 +-
 drivers/cpufreq/omap-cpufreq.c            |   14 ++
 25 files changed, 399 insertions(+), 260 deletions(-)
 create mode 100644 arch/arm/boot/dts/omap34xx.dtsi
 create mode 100644 arch/arm/boot/dts/omap4-panda-common.dtsi
 create mode 100644 arch/arm/boot/dts/omap443x.dtsi

vmlinux size change information (omap2plus_defconfig + CPUFREQ enabled):
add/remove: 0/0 grow/shrink: 5/0 up/down: 208/0 (208)
function                                     old     new   delta
omap_cpu_init                                360     472    +112
omap_generic_init                             96     140     +44
omap44xx_clks                               5832    5856     +24
omap3xxx_clks                               6720    6744     +24
omap3xxx_clk_init                           1072    1076      +4

non-zero DTB size deltas(bytes):
old	new	delta	 filename
10671	10898	+227	omap3-beagle-xm.dtb
9947	10190	+243	omap3-beagle.dtb
11399	11582	+183	omap3-devkit8000.dtb
9731	9974	+243	omap3-evm.dtb
10958	11141	+183	omap3-igep0020.dtb
10906	11089	+183	omap3-igep0030.dtb
10255	10438	+183	omap3-tobi.dtb
11361	11544	+183	omap3430-sdp.dtb
16270	16361	+91	omap4-panda-a4.dtb
16326	16409	+83	omap4-panda-es.dtb
16270	16361	+91	omap4-panda.dtb
19379	19470	+91	omap4-sdp.dtb
12943	13034	+91	omap4-var-som.dtb

Cc: Kevin Hilman <khilman@deeprootsystems.com>
Cc: Jon Hunter <jon-hunter@ti.com>
Cc: "Benoît Cousson" <b-cousson@ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Keerthy <j-keerthy@ti.com>
Cc: linux-omap@vger.kernel.org
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: cpufreq@vger.kernel.org
Cc: linux-pm@vger.kernel.org

Regards,
Nishanth Menon
-- 
1.7.9.5