Why spi is changed in dts

can anyone tell me why these are changed between the snapshot vs the v19? thanks

line 222
"compatible = ""qca,qca9560-spi"", ""qca,ar7100-spi"";"

line 225
"compatible = ""qca,ar934x-spi"";"

@981213 has written a new spi driver that replaces "qca,ar7100-spi" for the newer atheros/qualcomm SoCs.

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is there any way to backport this to v19? on snapshot my rootfs squashfs is fine for booting but on v19 it detects rootfs as jffs2 and panics because it cant find the filesystem