Turn gpiochip into device
The struct gpio_chip currently does not contain a struct device entry, but it should, and gpiochip_add() should use device_register().
The biggest symptom is the sysfs interface which is creating devices on-the-fly just to be able to spawn sysfs entries. Replace the sysfs hooks on-demand creation of devices with referencesto the new struct device in struct gpio_chip.
As a side effect, gpiochip_get() should use try_module_get() on the this new gpiochip device and increase reference count, and all current users doing module_get() on chip->owner should move to using gpiochip_get(), or maybe we should do both (needs to be investigated).
Blueprint information
- Status:
- Started
- Approver:
- Deepak Saxena
- Priority:
- Low
- Drafter:
- Linus Walleij
- Direction:
- Needs approval
- Assignee:
- Linus Walleij
- Definition:
- Approved
- Series goal:
- Accepted for kernel-merge-window
- Implementation:
-
Needs Infrastructure
- Milestone target:
- None
- Started by
- Linus Walleij
- Completed by
Whiteboard
Meta:
Roadmap id: KWG-MAINTENANCE
Headline: TODO
Acceptance: TODO
Work Items
Work items for backlog:
Inspect the userspace sysfs ABI for GPIO, maybe create some test: TODO
Make a patch removing the dummy devices and replace with a real refcounting device: TODO
Test the userspace with the changes: TODO
Iterate until the ABI conforms 100% to the old one: TODO
Submit patch to the linux-kernel mailing list: TODO
Await review: TODO
Iterate patch, collect ACKs: TODO
Await integration upstream: TODO
Dependency tree
* Blueprints in grey have been implemented.
