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CONFIG_GPIO_SYSFS: /sys/class/gpio/... (sysfs interface)

General informations

The Linux kernel configuration item CONFIG_GPIO_SYSFS:

Help text

Say Y here to add a sysfs interface for GPIOs.

This is mostly useful to work around omissions in a system's kernel support. Those are common in custom and semicustom hardware assembled using standard kernels with a minimum of custom patches. In those cases, userspace code may import a given GPIO from the kernel, if no kernel driver requested it.

Kernel drivers may also request that a particular GPIO be exported to userspace; this can be useful when debugging.



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