[PATCH v9 05/15] ABI: testing: sysfs-class-oxp: add tt_led attribute documentation

[Antheas Kapenekakis <lkml@antheas.dev>]

Adds documentation about the tt_led attribute of OneXPlayer devices
to the sysfs-class-oxp ABI documentation.

Reviewed-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Derek J. Clark <derekjohn.clark@gmail.com>
Signed-off-by: Antheas Kapenekakis <lkml@antheas.dev>
---
 Documentation/ABI/testing/sysfs-platform-oxp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-platform-oxp b/Documentation/ABI/testing/sysfs-platform-oxp
index 091269ab2c8c4..b3f39fc21dfa8 100644
--- a/Documentation/ABI/testing/sysfs-platform-oxp
+++ b/Documentation/ABI/testing/sysfs-platform-oxp
@@ -11,3 +11,15 @@ Description:
 		shortcut over the AT keyboard of the device. In addition,
 		using this setting is a prerequisite for PWM control for most
 		newer models (otherwise it NOOPs).
+
+What:		/sys/devices/platform/<platform>/tt_led
+Date:		April 2025
+KernelVersion:	6.16
+Contact:	"Antheas Kapenekakis" <lkml@antheas.dev>
+Description:
+		Some OneXPlayer devices (e.g., X1 series) feature a little LED
+		nested in the Turbo button. This LED is illuminated when the
+		device is in the higher TDP mode (e.g., 25W). Once tt_toggle
+		is engaged, this LED is left dangling to its last state. This
+		attribute allows userspace to control the LED state manually
+		(either with 1 or 0). Only a subset of devices contain this LED.
-- 
2.49.0