diff options
| author | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2025-07-04 14:58:55 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2025-07-16 10:27:08 +0200 |
| commit | 4fa93223e03eea3243db83786f556b6c1494de3e (patch) | |
| tree | ea856a2164e627f93ba414b999b9d115634f9283 /Documentation | |
| parent | 1cd53df733c21ae0d344a2dec941a3e2a06fefd9 (diff) | |
gpio: sysfs: export the GPIO directory locally in the gpiochip<id> directory
As a way to allow the user-space to stop referring to GPIOs by their
global numbers, introduce a parallel group of line attributes for
exported GPIO that live inside the GPIO chip class device and are
referred to by their HW offset within their parent chip.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250704-gpio-sysfs-chip-export-v4-8-9289d8758243@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/obsolete/sysfs-gpio | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/ABI/obsolete/sysfs-gpio b/Documentation/ABI/obsolete/sysfs-gpio index ff694708a3be..0d3f12c4dcbd 100644 --- a/Documentation/ABI/obsolete/sysfs-gpio +++ b/Documentation/ABI/obsolete/sysfs-gpio @@ -27,6 +27,9 @@ Description: /base ... (r/o) same as N /label ... (r/o) descriptive chip name /ngpio ... (r/o) number of GPIOs; numbered N to N + (ngpio - 1) + /gpio<OFFSET> + /value ... always readable, writes fail for input GPIOs + /direction ... r/w as: in, out (default low); write: high, low /chipX ... for each gpiochip; #X is the gpio device ID /export ... asks the kernel to export a GPIO at HW offset X to userspace /unexport ... to return a GPIO at HW offset X to the kernel |