On Mon, 2015-04-27 at 12:40 +0100, Sudeep Holla wrote: > On some ARM based systems, a separate Cortex-M based System Control > Processor(SCP) provides the overall power, clock, reset and system > control including CPU DVFS. SCPI Message Protocol is used to > communicate with the SCPI. > > This patch adds a interface driver for adding OPPs and registering > the arm_big_little cpufreq driver for such systems. > > Signed-off-by: Sudeep Holla <sudeep.ho...@arm.com> > Cc: Viresh Kumar <viresh.ku...@linaro.org> > Cc: "Rafael J. Wysocki" <r...@rjwysocki.net> > Cc: linux...@vger.kernel.org > --- > drivers/cpufreq/Kconfig.arm | 9 ++++ > drivers/cpufreq/Makefile | 1 + > drivers/cpufreq/scpi-cpufreq.c | 103 > +++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 113 insertions(+) > create mode 100644 drivers/cpufreq/scpi-cpufreq.c > > diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm > index 4f3dbc8cf729..9e678bf1687c 100644 > --- a/drivers/cpufreq/Kconfig.arm > +++ b/drivers/cpufreq/Kconfig.arm > @@ -24,6 +24,15 @@ config ARM_VEXPRESS_SPC_CPUFREQ > This add the CPUfreq driver support for Versatile Express > big.LITTLE platforms using SPC for power management. > > +config ARM_SCPI_CPUFREQ > + tristate "SCPI based CPUfreq driver" > + depends on ARM_BIG_LITTLE_CPUFREQ && ARM_SCPI_PROTOCOL
And ARM_BIG_LITTLE_CPUFREQ depends on CONFIG_ARM, so we can't build this for arm64, which is the only platform (Juno) we have to run these patches on. Unless you're prepared for a horrid hack... https://github.com/ARM-software/linux/commit/b9ceaa0cbd7c57d57ee7e69146cc627697570f6e or a pair of less horrid ones... http://git.linaro.org/kernel/linux-linaro-tracking.git/commit/4b5dd8ff98613b7e90c8f3214522a00ab6900fe9 http://git.linaro.org/kernel/linux-linaro-tracking.git/commit/8641dbfe253f6a9061742ca11f769fc1d82c2aaa Any reason why the above two aren't suitable for mainline Linux? The second was actually committed then reverted because it broke arm64 builds, but the other patch fixes that. -- Tixy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
