例如，查看ldo6
/sys/devices/soc.0/qcom,rpm-smd.35/rpm-regulator-ldoa6.85/regulator-l6.110/regulator/regulator.14
有以下文件：
1a98000.qcom,mdss_dsi-vddio
1a98300.qcom,mdss_dsi_pll-vddio
5-0048-vcc_i2c
device
hall_switch.70-vio
henu_ddev.69-ldo6
max_microvolts
microvolts
min_microvolts
name
num_users
opmode
power
state
subsystem
suspend_disk_state
suspend_mem_state
suspend_standby_state
type
uevent
原文：http://www.cnblogs.com/lp1129/p/5258006.html