[I] [BUG] RPi 4B SPI driver doesn't work with alternates [nuttx]

["linguini1 (via GitHub)" <gi...@apache.org>]

linguini1 opened a new issue, #16951:
URL: https://github.com/apache/nuttx/issues/16951

   ### Description / Steps to reproduce the issue
   
   The current SPI driver doesn't work with the listed alternates in the BCM2711 peripheral datasheet. Only SPI0 currently works, as SPI3-6 needs magic registers to be configured before they can work.
   
   In the Linux supported version, this is done by the Linux driver. Even with the correct dt-overlay file from the Raspberry Pi foundation's repository, the alternate interfaces are not enabled. The source code of other implementation may need to be examined to locate these registers.
   
   ### On which OS does this issue occur?
   
   [OS: Linux]
   
   ### What is the version of your OS?
   
   Arch Linux 6.6
   
   ### NuttX Version
   
   master
   
   ### Issue Architecture
   
   [Arch: arm64]
   
   ### Issue Area
   
   [Area: Drivers]
   
   ### Host information
   
   _No response_
   
   ### Verification
   
   - [x] I have verified before submitting the report.


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