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diff --git a/Documentation/admin-guide/gpio/gpio-mockup.rst b/Documentation/admin-guide/gpio/gpio-mockup.rst
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+++ b/Documentation/admin-guide/gpio/gpio-mockup.rst
@@ -3,6 +3,14 @@
GPIO Testing Driver
===================
+.. note::
+
+ This module has been obsoleted by the more flexible gpio-sim.rst.
+ New developments should use that API and existing developments are
+ encouraged to migrate as soon as possible.
+ This module will continue to be maintained but no new features will be
+ added.
+
The GPIO Testing Driver (gpio-mockup) provides a way to create simulated GPIO
chips for testing purposes. The lines exposed by these chips can be accessed
using the standard GPIO character device interface as well as manipulated