Changes between Version 40 and Version 41 of gpio


Ignore:
Timestamp:
02/27/2026 05:36:39 PM (7 weeks ago)
Author:
Ryan Erb
Comment:

add note for ownership

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  • gpio

    v40 v41  
    4141
    4242Each of these options requires a different level of software complexity.
     43
     44== GPIO Ownership
     45
     46There are some GPIO that Gateworks as defined as 'user' GPIO that can be used freely by the user. There are usually quantity two of these on a IO header somewhere on the SBC. However, there are many other GPIO in use on the board, some of which are owned by the system and not easily toggled by the user.
     47
     48Users may find that certain GPIO pins on the Gateworks SBC cannot be toggled directly from userspace via gpioset or sysfs. This is by design within the Linux Kernel architecture.
     49
     50When a GPIO is defined in the Device Tree and assigned to a specific kernel-level driver (such as those managing status LEDs, reset lines, or power regulators), the kernel reserves that pin to ensure system stability. Attempting to claim these pins from userspace will result in a Resource Busy error. To manipulate these functions, users should interact with the appropriate kernel subsystem API.
     51
     52To see different GPIOs in the device tree, see [wiki:linux/devicetree]
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