platform/x86: asus-wmi: Document the egpu_enable sysfs attribute

The egpu_enable attribute was not documented, this adds the
required documentation.

Fixes: 382b91db8044 ("asus-wmi: Add egpu enable method")
Signed-off-by: Luke D. Jones <luke@ljones.dev>
Link: https://lore.kernel.org/r/20220812222509.292692-3-luke@ljones.dev
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/Documentation/ABI/testing/sysfs-platform-asus-wmi b/Documentation/ABI/testing/sysfs-platform-asus-wmi
index 0f8f077..ac5ec3a 100644 (file)
--- a/Documentation/ABI/testing/sysfs-platform-asus-wmi
+++ b/Documentation/ABI/testing/sysfs-platform-asus-wmi
@@ -66,3 +66,14 @@ Description:
                Disable discrete GPU:
                        * 0 - Enable dGPU,
                        * 1 - Disable dGPU
+
+What:          /sys/devices/platform/<platform>/egpu_enable
+Date:          Aug 2022
+KernelVersion: 5.17
+Contact:       "Luke Jones" <luke@ljones.dev>
+Description:
+               Enable the external GPU paired with ROG X-Flow laptops.
+               Toggling this setting will also trigger ACPI to disable the dGPU:
+
+                       * 0 - Disable,
+                       * 1 - Enable