[PATCH v3 2/3] spi/xtensa-xtfpga: add DT binding documentation

[Max Filippov]

Signed-off-by: Max Filippov <jcmvbkbc@xxxxxxxxx>
---
 Documentation/devicetree/bindings/spi/spi-xtensa-xtfpga.txt | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/spi-xtensa-xtfpga.txt

diff --git a/Documentation/devicetree/bindings/spi/spi-xtensa-xtfpga.txt b/Documentation/devicetree/bindings/spi/spi-xtensa-xtfpga.txt
new file mode 100644
index 0000000..b6ebe2b
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-xtensa-xtfpga.txt
@@ -0,0 +1,9 @@
+Cadence Xtensa XTFPGA platform SPI controller.
+
+This simple SPI master controller is built into xtfpga bitstreams and is used
+to control daughterboard audio codec.
+
+Required properties:
+- compatible: should be "cdns,xtfpga-spi".
+- reg: physical base address of the controller and length of memory mapped
+  region.
-- 
1.8.1.4

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