Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Allwinner/D1H/CCU/CLK27M_FAN#0x0
CLK_SRC_SEL=PLL_VIDEO0_1X, GATING=OFF
CLK27M FANOUT Register
Factor M
Factor N
Clock Source Select
0 (PLL_VIDEO0_1X): undefined
1 (PLL_VIDEO1_1X): undefined
Gating for CLK27M
0 (OFF): undefined
1 (ON): undefined
https://github.com/cmsis-svd/cmsis-svd-data