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authorPi-Cheng Chen <pi-cheng.chen@linaro.org>2015-08-19 05:05:06 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-09-01 16:50:20 +0300
commit1453863fb02a18900c9079fa2e4f02710bf46507 (patch)
treebf785b11ca80200266a65d95a0480f1c82ded5bf /drivers/cpufreq/Kconfig.arm
parentc9c96ae2c57d91ea2b73ef447fdd44c760a96d97 (diff)
downloadlinux-1453863fb02a18900c9079fa2e4f02710bf46507.tar.xz
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.arm7
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