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| author | Nicolas Saenz Julienne <nsaenzjulienne@suse.de> | 2019-06-12 20:24:56 +0200 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2019-06-13 05:28:22 +0200 |
| commit | d3df18a97e586702920337056540267807b23f8e (patch) | |
| tree | 0a431d6334bd5f5f70656f4241aaf7bc3419cb11 /drivers/cpufreq/Kconfig.arm | |
| parent | cpufreq: Switch imx7d to imx-cpufreq-dt for speed grading (diff) | |
| download | linux-d3df18a97e586702920337056540267807b23f8e.tar.xz linux-d3df18a97e586702920337056540267807b23f8e.zip | |
cpufreq: add driver for Raspberry Pi
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.
Also, as the firmware interface might be configured as a module, making
the cpu clock unavailable during init, this implements a full fledged
driver, as opposed to most drivers registering cpufreq-dt, which only
make use of an init routine.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Acked-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/cpufreq/Kconfig.arm')
| -rw-r--r-- | drivers/cpufreq/Kconfig.arm | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm index 982efdf9c7e5..2499d0bccb3a 100644 --- a/drivers/cpufreq/Kconfig.arm +++ b/drivers/cpufreq/Kconfig.arm @@ -141,6 +141,14 @@ config ARM_QCOM_CPUFREQ_HW The driver implements the cpufreq interface for this HW engine. Say Y if you want to support CPUFreq HW. +config ARM_RASPBERRYPI_CPUFREQ + tristate "Raspberry Pi cpufreq support" + depends on CLK_RASPBERRYPI || COMPILE_TEST + help + This adds the CPUFreq driver for Raspberry Pi + + If in doubt, say N. + config ARM_S3C_CPUFREQ bool help |