Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Alif Semiconductor/AE302F40C1537LE_CM55_HP_View/CSI/CSI_PHY_TEST_CTRL0#0x0
PHY Test Control 0 Register
When active, performs test interface initialization. Active high.
Clock to capture TESTDIN bus contents into the PHY module, with TESTEN signal controlling the operation selection.
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https://github.com/cmsis-svd/cmsis-svd-data