[PATCH 0/8] ARM: OMAP3+: Switch to use DT based cpu0-cpufreq driver

Nishanth Menon
2013-03-14T20:58:07Z

The following series arose from trying to use BeagleBoard-XM (OMAP3 variant)
for doing CPU DVFS using cpufreq-cpu0. This series will eventually result in
migrating the cpufreq support only through device tree (part of the effort
to migrate away from non-DT configurations for OMAP). Unfortunately, as already
known, we have a bunch of legacy code and mutually dependent device tree
conversion that is pending.
Key features pending:
A) clock framework 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
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 like 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: Somewhere in the future, when we have regulators driven off CCF and OMAP
converted to CCF, we could remove the DT regulator requirements there as well.

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
DT. As a result of this series, CPUFreq feature will not be available for non-DT
boot systems.

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/

Test coverage:
test script: http://pastebin.com/MpCRY0SB
Platforms verified:
beaglebone(rev A6a) - AM33xx compatible
beagleboard (rev C1D) - OMAP3430 compatible
omap3-beagle-xm -OMAP3630 compatible
Pandaboard -(OMAP4430 ES2.3) verified with omapconf
Pandaboard-ES -(OMAP4460 ES1.1) verified with omapconf

Series is based on v3.9-rc2 tag

Also available at:
https://github.com/nmenon/linux-2.6-playground/commits/push/cpufreq-cpu0-omap-all-v1
git link: git://github.com/nmenon/linux-2.6-playground.git
branch: cpufreq-cpu0-omap-all-v1

Nishanth Menon (8):
ARM: dts: OMAP34xx: move CPU OPP tables to device tree
ARM: dts: OMAP36xx: move CPU OPP tables to device tree
ARM: dts: OMAP3: use twl4030 vdd1 regulator for CPU
ARM: dts: OMAP443x: move CPU OPP tables to device tree
ARM: dts: omap4-panda: move generic sections to panda-common
ARM: dts: OMAP446x: move CPU OPP tables to device tree
ARM: OMAP3+: use cpu0-cpufreq driver
cpufreq: omap: remove omap-cpufreq

MAINTAINERS | 1 -
arch/arm/boot/dts/omap3-beagle-xm.dts | 6 +
arch/arm/boot/dts/omap3-beagle.dts | 6 +
arch/arm/boot/dts/omap3-evm.dts | 6 +
arch/arm/boot/dts/omap3.dtsi | 10 +
arch/arm/boot/dts/omap36xx.dtsi | 12 ++
arch/arm/boot/dts/omap4-panda-a4.dts | 5 +-
arch/arm/boot/dts/omap4-panda-common.dtsi | 205 ++++++++++++++++++++
arch/arm/boot/dts/omap4-panda-es.dts | 5 +-
arch/arm/boot/dts/omap4-panda.dts | 200 +-------------------
arch/arm/boot/dts/omap4.dtsi | 10 +
arch/arm/boot/dts/omap446x.dtsi | 27 +++
arch/arm/boot/dts/twl4030.dtsi | 6 +
arch/arm/mach-omap2/board-generic.c | 4 +
arch/arm/mach-omap2/cclock33xx_data.c | 2 +-
arch/arm/mach-omap2/cclock3xxx_data.c | 2 +-
arch/arm/mach-omap2/cclock44xx_data.c | 2 +-
arch/arm/mach-omap2/opp3xxx_data.c | 20 --
arch/arm/mach-omap2/opp4xxx_data.c | 23 ---
drivers/cpufreq/Kconfig.arm | 6 -
drivers/cpufreq/Makefile | 1 -
drivers/cpufreq/omap-cpufreq.c | 291 -----------------------------
22 files changed, 305 insertions(+), 545 deletions(-)
create mode 100644 arch/arm/boot/dts/omap4-panda-common.dtsi
create mode 100644 arch/arm/boot/dts/omap446x.dtsi
delete mode 100644 drivers/cpufreq/omap-cpufreq.c

Size change information:
add/remove: 0/0 grow/shrink: 3/5 up/down: 74/-291 (-217)
function old new delta
omap_generic_init 96 140 +44
vermagic 49 64 +15
linux_banner 130 145 +15
kernel_config_data 18333 18330 -3
omap443x_opp_def_list 144 80 -64
omap36xx_opp_def_list 160 96 -64
omap446x_opp_def_list 192 112 -80
omap34xx_opp_def_list 208 128 -80

non-zero DTB size deltas(bytes):
old new delta filename
8068 8311 +243 omap3-beagle.dtb
8647 8874 +227 omap3-beagle-xm.dtb
7783 8026 +243 omap3-evm.dtb
8000 8183 +183 omap3-tobi.dtb
13646 13771 +125 omap4-panda-a4.dtb
13646 13771 +125 omap4-panda.dtb
13602 13719 +117 omap4-panda-es.dtb
16256 16381 +125 omap4-sdp.dtb
10889 11014 +125 omap4-var-som.dtb

Cc: Kevin Hilman <khilman@deeprootsystems.com>
Cc: "Beno√Æt 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