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| author | Pi-Cheng Chen <pi-cheng.chen@linaro.org> | 2015-08-19 04:05:06 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-09-01 15:50:20 +0200 |
| commit | 1453863fb02a18900c9079fa2e4f02710bf46507 (patch) | |
| tree | bf785b11ca80200266a65d95a0480f1c82ded5bf /drivers/cpufreq/Kconfig.arm | |
| parent | dt-bindings: mediatek: Add MT8173 CPU DVFS clock bindings (diff) | |
| download | linux-1453863fb02a18900c9079fa2e4f02710bf46507.tar.xz linux-1453863fb02a18900c9079fa2e4f02710bf46507.zip | |
cpufreq: mediatek: Add MT8173 cpufreq driver
Mediatek MT8173 is an ARMv8 based quad-core (2*Cortex-A53 and
2*Cortex-A72) SoC with duall clusters. For each cluster, two voltage
inputs, Vproc and Vsram are supplied by two regulators. For the big
cluster, two regulators come from different PMICs. In this case, when
scaling voltage inputs of the cluster, the voltages of two regulator
inputs need to be controlled by software explicitly under the SoC
specific limitation:
100mV < Vsram - Vproc < 200mV
which is called 'voltage tracking' mechanism. And when scaling the
frequency of cluster clock input, the input MUX need to be parented to
another "intermediate" stable PLL first and reparented to the original
PLL once the original PLL is stable at the target frequency. This patch
implements those mechanisms to enable CPU DVFS support for Mediatek
MT8173 SoC.
Signed-off-by: Pi-Cheng Chen <pi-cheng.chen@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/Kconfig.arm')
| -rw-r--r-- | drivers/cpufreq/Kconfig.arm | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm index cc8a71c267b8..2bacf24a19a9 100644 --- a/drivers/cpufreq/Kconfig.arm +++ b/drivers/cpufreq/Kconfig.arm @@ -130,6 +130,13 @@ config ARM_KIRKWOOD_CPUFREQ This adds the CPUFreq driver for Marvell Kirkwood SoCs. +config ARM_MT8173_CPUFREQ + bool "Mediatek MT8173 CPUFreq support" + depends on ARCH_MEDIATEK && REGULATOR + select PM_OPP + help + This adds the CPUFreq driver support for Mediatek MT8173 SoC. + config ARM_OMAP2PLUS_CPUFREQ bool "TI OMAP2+" depends on ARCH_OMAP2PLUS |