代码拉取完成，页面将自动刷新
After running make command, there will be two modules:
The fist module is our fake rtc driver, the second one is used to create a plateform device that matches our first module. This way, one can avoid updating the devicetree.
# insmod ./fake-rtc.ko
# insmod ./rtc-ins.ko
After loading both modules, one can print debug message, and see something like below:
# dmesg
[ 3390.052469] fake-rtc fake-rtc.0: rtc core: registered fake-rtc as rtc2
[ 3390.058033] fake-rtc fake-rtc.0: loaded; begin_time is 3390, rtc_time is 0
Before loading the module, there were no rtc2
# ls -l /dev/rtc*
lrwxrwxrwx 1 root root 4 Aug 12 17:54 /dev/rtc -> rtc0
crw------- 1 root root 254, 0 Aug 12 17:54 /dev/rtc0
crw------- 1 root root 254, 1 Aug 12 17:54 /dev/rtc1
After loading modules,
# ls -l /dev/rtc*
lrwxrwxrwx 1 root root 4 Aug 12 17:55 /dev/rtc -> rtc0
crw------- 1 root root 254, 0 Aug 12 17:55 /dev/rtc0
crw------- 1 root root 254, 1 Aug 12 17:55 /dev/rtc1
crw------- 1 root root 254, 1 Aug 12 17:55 /dev/rtc2
One can also check other parameters as below:
# udevadm info /dev/rtc2
P: /devices/platform/fake-rtc.0/rtc/rtc2
N: rtc2
E: DEVNAME=/dev/rtc2
E: DEVPATH=/devices/platform/fake-rtc.0/rtc/rtc2
E: MAJOR=254
E: MINOR=2
E: SUBSYSTEM=rtc
# cat /sys/class/rtc/rtc2/name
fake-rtc
# cat /sys/class/rtc/rtc2/date
1970-01-01
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