Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Raspberry Pi/RP2040/SPI0/SSPPERIPHID2#0x0
Peripheral identification registers, SSPPeriphID0-3 on page 3-13
These bits read back as 0x4
These bits return the peripheral revision
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https://github.com/cmsis-svd/cmsis-svd-data