[PATCH rtems-docs] user/microblaze: Document GPIO driver

[Alex White]

---
 user/bsps/bsps-microblaze.rst | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/user/bsps/bsps-microblaze.rst b/user/bsps/bsps-microblaze.rst
index 3ad8179..0f28491 100644
--- a/user/bsps/bsps-microblaze.rst
+++ b/user/bsps/bsps-microblaze.rst
@@ -80,6 +80,15 @@ from the device tree to configure the QSPI NOR JFFS2 driver. The following
 device tree node properties are used to configure the QSPI NOR JFFS2 driver:
 ``reg`` and ``interrupts``.
 
+GPIO Driver
+-----------
+
+The GPIO driver supports the QEMU emulated Xilinx AXI GPIO v2.0. If device tree
+support is enabled in the build configuration, the GPIO driver will use nodes
+that are compatible with `xlnx,xps-gpio-1.00.a` from the device tree to
+configure the GPIO driver. The following device tree node properties are used to
+configure the GPIO driver: ``reg``, ``xlnx,is-dual``,
+``xlnx,interrupt-present``, and ``interrupts``.
 
 Running Executables
 -------------------
@@ -150,6 +159,16 @@ configuration, the console driver will use the node that is compatible with
 following device tree node properties are used to configure the console driver:
 ``reg``, ``status``, ``port-number``, and ``interrupts``.
 
+GPIO Driver
+-----------
+
+The GPIO driver supports the Xilinx AXI GPIO v2.0. If device tree support is
+enabled in the build configuration, the GPIO driver will use nodes that are
+compatible with `xlnx,xps-gpio-1.00.a` from the device tree to configure the
+GPIO driver. The following device tree node properties are used to configure the
+GPIO driver: ``reg``, ``xlnx,is-dual``, ``xlnx,interrupt-present``, and
+``interrupts``.
+
 Debugging
 ---------
 
-- 
2.34.1