ghnotgood opened a new pull request, #19590:
URL: https://github.com/apache/nuttx/pull/19590

   - ISO1H812G is *output* only expander, not input.
   - Warning make sense when we try to set the expander the wrong way.
   
   
   ## Summary
   
   This change fixes warning that are confusing. Initializing ISO1H812G shows 
warning about that it is output only expander even when it is used as output 
only. Similarly, initializing ISO1I813T shows warning about that it is input 
only expander even when it is used as input only.
   
   ## Impact
   
   Improve developers experience.
   
   ## Testing
   
   I have successfully compiled NuttX with these changes with GPIO and SPI 
debugging on. I have confirmed that warning is not shown when ISO1H812G is used 
for output and ISO1I813T for input.


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