Subj : gpio on x86
To   : Gerrit Kuehn
From : Alexey Vissarionov
Date : Fri May 13 2022 10:28 am

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
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