On 20-05-19, 12:47, Nicolas Saenz Julienne wrote: > Raspberry Pi's firmware offers and interface though which update it's > performance requirements. It allows us to request for specific runtime > frequencies, which the firmware might or might not respect, depending on > the firmware configuration and thermals. > > As the maximum and minimum frequencies are configurable in the firmware > there is no way to know in advance their values. So the Raspberry Pi > cpufreq driver queries them, builds an opp frequency table to then > launch cpufreq-dt. > > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulie...@suse.de> > --- > drivers/cpufreq/Kconfig.arm | 8 +++ > drivers/cpufreq/Makefile | 1 + > drivers/cpufreq/raspberrypi-cpufreq.c | 83 +++++++++++++++++++++++++++ > 3 files changed, 92 insertions(+) > create mode 100644 drivers/cpufreq/raspberrypi-cpufreq.c > > diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm > index 179a1d302f48..f6eba7ae50d0 100644 > --- a/drivers/cpufreq/Kconfig.arm > +++ b/drivers/cpufreq/Kconfig.arm > @@ -308,3 +308,11 @@ config ARM_PXA2xx_CPUFREQ > This add the CPUFreq driver support for Intel PXA2xx SOCs. > > If in doubt, say N. > + > +config ARM_RASPBERRYPI_CPUFREQ > + tristate "Raspberry Pi cpufreq support" > + depends on RASPBERRYPI_FIRMWARE || COMPILE_TEST > + help > + This adds the CPUFreq driver for Raspberry Pi > + > + If in doubt, say N. > diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile > index 689b26c6f949..02678e9b2ff5 100644 > --- a/drivers/cpufreq/Makefile > +++ b/drivers/cpufreq/Makefile > @@ -84,6 +84,7 @@ obj-$(CONFIG_ARM_TEGRA124_CPUFREQ) += tegra124-cpufreq.o > obj-$(CONFIG_ARM_TEGRA186_CPUFREQ) += tegra186-cpufreq.o > obj-$(CONFIG_ARM_TI_CPUFREQ) += ti-cpufreq.o > obj-$(CONFIG_ARM_VEXPRESS_SPC_CPUFREQ) += vexpress-spc-cpufreq.o > +obj-$(CONFIG_ARM_RASPBERRYPI_CPUFREQ) += raspberrypi-cpufreq.o
My bad sorry, I noticed this earlier and forgot to comment. The above two files are maintained in alphabetical order, please add the entries at relevant places. > > ################################################################################## > diff --git a/drivers/cpufreq/raspberrypi-cpufreq.c > b/drivers/cpufreq/raspberrypi-cpufreq.c > new file mode 100644 > index 000000000000..a85988867d56 > --- /dev/null > +++ b/drivers/cpufreq/raspberrypi-cpufreq.c > @@ -0,0 +1,83 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Raspberry Pi cpufreq driver > + * > + * Copyright (C) 2019, Nicolas Saenz Julienne <nsaenzjulie...@suse.de> > + */ > + > +#include <linux/of.h> > +#include <linux/clk.h> > +#include <linux/cpu.h> > +#include <linux/module.h> > +#include <linux/pm_opp.h> > +#include <linux/cpufreq.h> > +#include <linux/platform_device.h> Would be better to keep above in alphabetical order as well. Please don't send another version now and wait for comments on the other patches. -- viresh
