1. 根目录:
2. drivers
3. clk
4. socfpga
5. Makefile

obj-y += clk.o
obj-y += clk-gate.o
obj-y += clk-pll.o
obj-y += clk-periph.o
obj-y += clk-pll-a10.o clk-periph-a10.o clk-gate-a10.o