[PATCH 1/3] riscv: defconfig, Kconfig: enable CPU power management

[Yash Shah <yash.shah@sifive.com>]

Enable CPUFreq and CPUIdle for RISC-V systems to be configured with
Kconfig, and compile the kernel code to support it by default. This
will be used to support dynamic CPU frequency switching for the HiFive
Unleashed board, along with any future RISC-V boards that support
CPU power management.

Signed-off-by: Yash Shah <yash.shah@sifive.com>
---
 arch/riscv/Kconfig           | 8 ++++++++
 arch/riscv/configs/defconfig | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index a31e1a4..1c8443e 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -381,6 +381,14 @@ endchoice
 
 endmenu
 
+menu "CPU Power Management"
+
+source "drivers/cpuidle/Kconfig"
+
+source "drivers/cpufreq/Kconfig"
+
+endmenu
+
 menu "Power management options"
 
 source "kernel/power/Kconfig"
diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig
index 4da4886..58f4bce 100644
--- a/arch/riscv/configs/defconfig
+++ b/arch/riscv/configs/defconfig
@@ -17,6 +17,11 @@ CONFIG_BPF_SYSCALL=y
 CONFIG_SOC_SIFIVE=y
 CONFIG_SOC_VIRT=y
 CONFIG_SMP=y
+CONFIG_CPU_IDLE=y
+CONFIG_CPU_FREQ=y
+CONFIG_CPU_FREQ_STAT=y
+CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
+CONFIG_CPUFREQ_DT=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 CONFIG_NET=y
-- 
2.7.4