kernel/drivers/gpio/gpiolib-devres.c, branch linux-5.1.y

gpio: Add devm_gpiod_unhinge()

2018-12-11T01:04:23Z

This adds a function named devm_gpiod_unhinge() that removes the resource management from a GPIO descriptor. I am not sure if this is the best anglosaxon name for the function, no other managed resources have an equivalent currently, but I chose "unhinge" as the closest intuitive thing I could imagine that fits Rusty Russell's API design criterions "the obvious use is the correct one" and "the name tells you how to use it". The idea came out of a remark from Mark Brown that it should be possible to handle over management of a resource from devres to the regulator core, and indeed we can do that. Signed-off-by: Linus Walleij Reviewed-by: Marek Szyprowski Tested-by: Marek Szyprowski Reviewed-by: Charles Keepax Signed-off-by: Mark Brown

gpio: devres: Handle nonexclusive GPIOs

2018-12-11T01:04:17Z

When we get a nonexeclusive GPIO descriptor using managed resources, we should only add it to the list of managed resources once: on the first user. Augment the devm_gpiod_get_index() and devm_gpiod_get_from_of_node() calls to account for this by checking if the descriptor is already resource managed before we proceed to allocate a new resource management struct. Fixes: b0ce7b29bfcd ("regulator/gpio: Allow nonexclusive GPIO access") Reported-by: Marek Szyprowski Signed-off-by: Linus Walleij Reviewed-by: Marek Szyprowski Tested-by: Marek Szyprowski Reviewed-by: Charles Keepax Signed-off-by: Mark Brown

gpio: Rename devres implementation file

2018-09-25T07:11:50Z

All the other core files are named "gpiolib-" so let's rename the devres as well so we have some logical namespacing here. Signed-off-by: Linus Walleij