diff options
Diffstat (limited to 'drivers/gpio/TODO')
| -rw-r--r-- | drivers/gpio/TODO | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/drivers/gpio/TODO b/drivers/gpio/TODO index 4b70cbaa1caa..7a09a4f58551 100644 --- a/drivers/gpio/TODO +++ b/drivers/gpio/TODO @@ -44,6 +44,13 @@ Work items: to a machine description such as device tree, ACPI or fwnode that implicitly does not use global GPIO numbers. +- Fix drivers to not read back struct gpio_chip::base. Some drivers do + that and would be broken by attempts to poison it or make it dynamic. + Example in AT91 pinctrl driver: + https://lore.kernel.org/all/1d00c056-3d61-4c22-bedd-3bae0bf1ddc4@pengutronix.de/ + This particular driver is also DT-only, so with the above fixed, the + base can be made dynamic (set to -1) if CONFIG_GPIO_SYSFS is disabled. + - When this work is complete (will require some of the items in the following ongoing work as well) we can delete the old global numberspace accessors from <linux/gpio.h> and eventually delete @@ -124,6 +131,11 @@ Work items: helpers (x86 inb()/outb()) and convert port-mapped I/O drivers to use this with dry-coding and sending to maintainers to test +- Move the MMIO GPIO specific fields out of struct gpio_chip into a + dedicated structure. Currently every GPIO chip has them if gpio-mmio is + enabled in Kconfig even if it itself doesn't register with the helper + library. + ------------------------------------------------------------------------------- Generic regmap GPIO @@ -176,16 +188,12 @@ 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. +Remove legacy sysfs features -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. ------------------------------------------------------------------------------- |