diff options
Diffstat (limited to 'drivers/gpio/TODO')
| -rw-r--r-- | drivers/gpio/TODO | 26 |
1 files changed, 5 insertions, 21 deletions
diff --git a/drivers/gpio/TODO b/drivers/gpio/TODO index 4a8b349f2483..8ed74e05903a 100644 --- a/drivers/gpio/TODO +++ b/drivers/gpio/TODO @@ -171,28 +171,12 @@ cannot be converted yet, but watch this space! ------------------------------------------------------------------------------- -Convert all GPIO chips to using the new, value returning line setters +Remove legacy sysfs features -struct gpio_chip's set() and set_multiple() callbacks are now deprecated. They -return void and thus do not allow drivers to indicate failure to set the line -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. +We have two parallel per-chip class devices and per-exported-line attribute +groups in sysfs. One is using the obsolete global GPIO numberspace and the +second relies on hardware offsets of pins within the chip. Remove the former +once user-space has switched to using the latter. ------------------------------------------------------------------------------- |