Public bug reported:
It appears we don't set the CONFIG_GPIO_SYSFS on Trusty (or Utopic?) for
x86.
By enabled, I mean:
CONFIG_GPIO_SYSFS=y
This option (along with a few gpio devices) is needed to enable
programming of such things as the I2C Mux through via the CPLDs on some
OEM 'whitebox' switches that will leverage Software Defined Networking.
This option can, of course, be set and users can build their own
kernels, but, if at all possible they'd like to keep this as stock as
they can.
config GPIO_SYSFS
bool "/sys/class/gpio/... (sysfs interface)"
depends on SYSFS
help
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1342153
Title:
Enable CONFIG_GPIO_SYSFS option in the Kernel
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