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gpio: TODO: add an item to track reworking the sysfs interface

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It seems there really exists the need for a simple sysfs interface that
can be easily used from minimal initramfs images that don't contain much
more than busybox. However the current interface poses a challenge to
the removal of global GPIO numberspace. Add an item that tracks
extending the existing ABI with a per-chip export/unexport attribute
pair.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250321-gpio-todo-updates-v1-6-7b38f07110ee@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Bartosz Golaszewski
2025-03-21 16:49:38 +01:00
parent 9ff2443b37
commit af54a2fbdf
1 changed files with 13 additions and 0 deletions
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13
drivers/gpio/TODO
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@@ -173,3 +173,16 @@ value back to the caller.
We've now added new variants - set_rv() and set_multiple_rv() that return an
integer. Let's convert all GPIO drivers treewide to use the new callbacks,
remove the old ones and finally rename the new ones back to the old names.
-------------------------------------------------------------------------------
Extend the sysfs ABI to allow exporting lines by their HW offsets
The need to support the sysfs GPIO class is one of the main obstacles to
removing the global GPIO numberspace from the kernel. In order to wean users
off using global numbers from user-space, extend the existing interface with
new per-gpiochip export/unexport attributes that allow to refer to GPIOs using
their hardware offsets within the chip.
Encourage users to switch to using them and eventually remove the existing
global export/unexport attribues.