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ABI: testing: sysfs-class-oxp: add tt_led attribute documentation

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>
Link: https://lore.kernel.org/r/20250425111821.88746-6-lkml@antheas.dev
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

authored by

Antheas Kapenekakis and committed by
Ilpo Järvinen 3abff549 d9c4037f

+12
+12
Documentation/ABI/testing/sysfs-platform-oxp
··· 11 11 shortcut over the AT keyboard of the device. In addition, 12 12 using this setting is a prerequisite for PWM control for most 13 13 newer models (otherwise it NOOPs). 14 + 15 + What: /sys/devices/platform/<platform>/tt_led 16 + Date: April 2025 17 + KernelVersion: 6.16 18 + Contact: "Antheas Kapenekakis" <lkml@antheas.dev> 19 + Description: 20 + Some OneXPlayer devices (e.g., X1 series) feature a little LED 21 + nested in the Turbo button. This LED is illuminated when the 22 + device is in the higher TDP mode (e.g., 25W). Once tt_toggle 23 + is engaged, this LED is left dangling to its last state. This 24 + attribute allows userspace to control the LED state manually 25 + (either with 1 or 0). Only a subset of devices contain this LED.