From: Paolo Pisati <p.pis...@gmail.com>

Add dt binding documentation details for Lattice MachXO2 FPGA configuration
over Slave SPI interface.

Signed-off-by: Paolo Pisati <p.pis...@gmail.com>
Acked-by: Rob Herring <r...@kernel.org>
Acked-by: Moritz Fischer <m...@kernel.org>
Acked-by: Alan Tull <at...@kernel.org>
---
 .../bindings/fpga/lattice-machxo2-spi.txt          | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 
Documentation/devicetree/bindings/fpga/lattice-machxo2-spi.txt

diff --git a/Documentation/devicetree/bindings/fpga/lattice-machxo2-spi.txt 
b/Documentation/devicetree/bindings/fpga/lattice-machxo2-spi.txt
new file mode 100644
index 000000000000..a8c362eb160c
--- /dev/null
+++ b/Documentation/devicetree/bindings/fpga/lattice-machxo2-spi.txt
@@ -0,0 +1,29 @@
+Lattice MachXO2 Slave SPI FPGA Manager
+
+Lattice MachXO2 FPGAs support a method of loading the bitstream over
+'slave SPI' interface.
+
+See 'MachXO2ProgrammingandConfigurationUsageGuide.pdf' on www.latticesemi.com
+
+Required properties:
+- compatible: should contain "lattice,machxo2-slave-spi"
+- reg: spi chip select of the FPGA
+
+Example for full FPGA configuration:
+
+       fpga-region0 {
+               compatible = "fpga-region";
+               fpga-mgr = <&fpga_mgr_spi>;
+               #address-cells = <0x1>;
+               #size-cells = <0x1>;
+       };
+
+       spi1: spi@2000 {
+        ...
+
+               fpga_mgr_spi: fpga-mgr@0 {
+                       compatible = "lattice,machxo2-slave-spi";
+                       spi-max-frequency = <8000000>;
+                       reg = <0>;
+               };
+       };
-- 
2.16.2

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