From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@xxxxxxx>
Hi Rafael,
The SPC(Serial Power Controller) on Versatile Express V2P-CA15_A7(TC2)
not only controls low-power states, wake-up irqs and per-CPU jump addresses
but also the CPU performance operating points which is essential to provide
CPU DVFS. The M3 microcontroller can provide upto eight performance values,
one set for each cluster (CA15 or CA7). Each of this value contains the
frequency(kHz) and voltage(mV) at that performance level. It expects
these performance level to be passed through the SPC PERF_LVL registers.
This patch series adds support to populate those OPPs, add them to the
cpu devices and runtime programming of these performance levels through
clock framework. It also adds a small interface cpufreq driver to validate
the OPPs and register the arm_big_little cpufreq driver.
Changes v2->v3:
- Dropped "cpufreq: arm-big-little: use clk_get instead of
clk_get_sys" as it's already pulled in.
- Rebased on [1] to include opp_* to dev_pm_opp_* changes
Changes v1->v2:
- Introduced ARCH_VEXPRESS_SPC config to make dependency
selection cleaner
- Other minor review comments from Nico implemented
Regards,
Sudeep
[1] git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git
linux-next
Sudeep KarkadaNagesha (4):
ARM: vexpress/TC2: add support for CPU DVFS
ARM: vexpress/TC2: add cpu clock support
cpufreq: arm_big_little: add vexpress SPC interface driver
ARM: vexpress/TC2: register vexpress-spc cpufreq device
arch/arm/mach-vexpress/Kconfig | 12 ++
arch/arm/mach-vexpress/Makefile | 3 +-
arch/arm/mach-vexpress/spc.c | 366 ++++++++++++++++++++++++++++++++-
arch/arm/mach-vexpress/spc.h | 2 +-
arch/arm/mach-vexpress/tc2_pm.c | 7 +-
drivers/cpufreq/Kconfig.arm | 8 +
drivers/cpufreq/Makefile | 1 +
drivers/cpufreq/vexpress-spc-cpufreq.c | 70 +++++++
8 files changed, 464 insertions(+), 5 deletions(-)
create mode 100644 drivers/cpufreq/vexpress-spc-cpufreq.c
--
1.8.1.2
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