https://community.nxp.com/t5/i-MX-Processors/Device-Driver-I-O-Expander/m-p/2093678#M237044 hello,<BR />do you still have the code you made? I have the same problem, it would be very helpful.<BR />Thanks Thu, 08 May 2025 13:07:12 GMT Transidico 2025-05-08T13:07:12Z https://community.nxp.com/t5/i-MX-Processors/Device-Driver-I-O-Expander/m-p/1240568#M170364 <P>Hello Folks!<BR />I am trying to develop a device driver for a I/O expander. The device that I use for it is PCF8574T from NXP. And I am using the IMX8MMEVK board to do it.</P><P>I wrote a device driver that it works fine - look the attached pcf8574t.tar.gz. But now I would like to map each GpIO of pcf8574t on sysfs over /sys/class/gpio. Does anybody has a tip about how can I do it?</P><P>Thanks in advance.</P><P>&nbsp;</P> Fri, 05 Mar 2021 00:02:25 GMT https://community.nxp.com/t5/i-MX-Processors/Device-Driver-I-O-Expander/m-p/1240568#M170364 oprata 2021-03-05T00:02:25Z https://community.nxp.com/t5/i-MX-Processors/Device-Driver-I-O-Expander/m-p/1240648#M170371 <P>Hi</P> <P>&nbsp;</P> <P>You can see this reply&nbsp;<A href="https://forums.balena.io/t/gpio-mapping-on-variscite-board/80718" target="_self">https://forums.balena.io/t/gpio-mapping-on-variscite-board/80718</A>&nbsp;</P> <P>&nbsp;</P> <P>BR</P> <P>Zhiming</P> Fri, 05 Mar 2021 03:05:27 GMT https://community.nxp.com/t5/i-MX-Processors/Device-Driver-I-O-Expander/m-p/1240648#M170371 Zhiming_Liu 2021-03-05T03:05:27Z https://community.nxp.com/t5/i-MX-Processors/Device-Driver-I-O-Expander/m-p/2093678#M237044 hello,<BR />do you still have the code you made? I have the same problem, it would be very helpful.<BR />Thanks Thu, 08 May 2025 13:07:12 GMT https://community.nxp.com/t5/i-MX-Processors/Device-Driver-I-O-Expander/m-p/2093678#M237044 Transidico 2025-05-08T13:07:12Z