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   TZUTC: 0300   
   Good ${greeting_time}, Gerrit!   
      
   12 May 2022 18:33:52, you wrote to *:   
      
    GK> I have an Intel-based mainboard with build-in gpios that I'd like   
    GK> to use. However, I cannot get the kernel (5.16) to recognise the   
    GK> chip (NXP PCA9554). To my understanding, this should be supported   
    GK> with the gpio_pca953x kernel module.   
      
   Or not supported.   
      
    GK> Upon loading this, the kernel reports no device or chip found, so   
    GK> all further actions via /sys/class/gpio/ or gpioinfo return nothing.   
    GK> Any ideas what I might be missing here?   
      
   https://www.ti.com/lit/gpn/pca9554   
   https://www.onsemi.com/pdf/datasheet/pca9554-d.pdf   
   https://www.nxp.com/docs/en/data-sheet/PCA9554_9554A.pdf   
      
   Quite enough to write your own kernel module.   
      
      
   --   
   Alexey V. Vissarionov aka Gremlin from Kremlin   
   gremlin.ru!gremlin; +vii-cmiii-ccxxix-lxxix-xlii   
      
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