How to ADD SPI device in to machine mach-gs-oolite-v1 of ar71xx in OpenWrt version 4.14

Hi All,
I am working on mach-gs-oolite-v1 device of ar71xx family. It have SPI nor flash m25p80.(Working OK)
I want to add normal SPI device in this machine.
I have modify the machine file and it is compile but after flashing i'm facing kernel crash issue.
can any one help to add new SPI device .

I'm attaching machine file and kernel crash log.

any help on the issue ??