[v1] gpio: sysfs: add a per-chip export/unexport attribute pair

[PATCH RFC/RFT 02/15] Documentation: gpio: document the active_low field in the sysfs ABI

Posted by Bartosz Golaszewski 4 months ago

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Exported GPIO lines also have the active_low attribute which is not
documented. Add a short mention for it.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 Documentation/ABI/obsolete/sysfs-gpio | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/ABI/obsolete/sysfs-gpio b/Documentation/ABI/obsolete/sysfs-gpio
index 8203bc2128db7eb9ea6724884e680ed4b669853c..480316fee6d80fb7a0ed61706559838591ec0932 100644
--- a/Documentation/ABI/obsolete/sysfs-gpio
+++ b/Documentation/ABI/obsolete/sysfs-gpio
@@ -22,6 +22,7 @@ Description:
 	    /value ... always readable, writes fail for input GPIOs
 	    /direction ... r/w as: in, out (default low); write: high, low
 	    /edge ... r/w as: none, falling, rising, both
+	    /active_low ... r/w as: 0, 1
 	/gpiochipN ... for each gpiochip; #N is its first GPIO
 	    /base ... (r/o) same as N
 	    /label ... (r/o) descriptive, not necessarily unique

-- 
2.48.1

Re: [PATCH RFC/RFT 02/15] Documentation: gpio: document the active_low field in the sysfs ABI

Posted by Linus Walleij 4 months ago

On Tue, Jun 10, 2025 at 4:38 PM Bartosz Golaszewski <brgl@bgdev.pl> wrote:

> From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
>
> Exported GPIO lines also have the active_low attribute which is not
> documented. Add a short mention for it.
>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij