[dm][dvfs] support Dynamic Voltage and Frequency Scaling (DVFS)

bsp/rockchip/dm/Kconfig

@@ -1,6 +1,9 @@
 SOC_DM_ADC_DIR          = $(SOC_DM_DIR)/adc
 SOC_DM_CAN_DIR          = $(SOC_DM_DIR)/can
 SOC_DM_CLK_DIR          = $(SOC_DM_DIR)/clk
+SOC_DM_DVFS_EVENT_DIR   = $(SOC_DM_DIR)/dvfs/event
+SOC_DM_DVFS_CPUFREQ_DIR = $(SOC_DM_DIR)/dvfs/cpufreq
+SOC_DM_DVFS_DEVFREQ_DIR = $(SOC_DM_DIR)/dvfs/devfreq
 SOC_DM_HWCRYPTO_DIR     = $(SOC_DM_DIR)/hwcrypto
 SOC_DM_HWSPINLOCK_DIR   = $(SOC_DM_DIR)/hwspinlock
 SOC_DM_CLOCK_TIME_DIR   = $(SOC_DM_DIR)/hwtimer

bsp/rockchip/dm/dvfs/SConscript

@@ -0,0 +1,21 @@
+from building import *
+
+group = []
+
+if not GetDepend(['RT_USING_DVFS']):
+    Return('group')
+
+cwd = GetCurrentDir()
+list = os.listdir(cwd)
+CPPPATH = [cwd + '/../include']
+
+src = []
+
+group = DefineGroup('DeviceDrivers', src, depend = [''], CPPPATH = CPPPATH)
+
+for d in list:
+    path = os.path.join(cwd, d)
+    if os.path.isfile(os.path.join(path, 'SConscript')):
+        group = group + SConscript(os.path.join(d, 'SConscript'))
+
+Return('group')

bsp/rockchip/dm/dvfs/cpufreq/Kconfig

@@ -0,0 +1,10 @@
+config RT_DVFS_ROCKCHIP_CPUFREQ
+    bool "Rockchip CPUfreq driver"
+    depends on RT_USING_DVFS
+    depends on RT_USING_OFW
+    default y
+    help
+      Rockchip CPUfreq with OPP table parsing and optional nvmem
+      bin/leakage voltage selection. Uses SCMI clock and DT cpu-supply
+      regulator (e.g. FAN53555). Thermal throttling uses
+      thermal-cool-dvfs on the cpufreq device.

bsp/rockchip/dm/dvfs/cpufreq/SConscript

@@ -0,0 +1,13 @@
+from building import *
+
+group = []
+src = []
+cwd = GetCurrentDir()
+CPPPATH = [cwd + '/../../include']
+
+if GetDepend(['RT_DVFS_ROCKCHIP_CPUFREQ']):
+    src += ['dvfs-rockchip-cpufreq.c']
+
+group = DefineGroup('DeviceDrivers', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')