Re: [PATCH v2 1/2] dt: bindings: fpga: add xilinx slave-serial binding description

---
Changes in v2:

 - correct gpios properties in example to match above description

 - use fpga-mgr@0 instead of fpga-spi@0 in example

 .../bindings/fpga/xilinx-slave-serial.txt          | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/fpga/xilinx-slave-serial.txt

diff --git a/Documentation/devicetree/bindings/fpga/xilinx-slave-serial.txt b/Documentation/devicetree/bindings/fpga/xilinx-slave-serial.txt
new file mode 100644
index 0000000..20b0731
--- /dev/null
+++ b/Documentation/devicetree/bindings/fpga/xilinx-slave-serial.txt

@@ -0,0 +1,24 @@
+Xilinx Slave Serial SPI FPGA Manager
+
+Xilinx Spartan-6 FPGAs support a method of loading the bitstream over
+what is referred to as "slave serial" interface.
+The slave serial link is not technically SPI, and might require extra
+circuits in order to play nicely with other SPI slaves on the same bus.
+
+See https://www.xilinx.com/support/documentation/user_guides/ug380.pdf
+
+Required properties:
+- compatible: should contain "xlnx,fpga-slave-serial"
+- reg: spi chip select of the FPGA
+- prog_b-gpios: config pin (referred to as PROGRAM_B in the manual)
+- done-gpios: config status pin (referred to as DONE in the manual)
+
+Example:
+       fpga_mgr_spi: fpga-mgr@0 {
+               compatible = "xlnx,fpga-slave-serial";
+               spi-max-frequency = <60000000>;
+               spi-cpha;
+               reg = <0>;
+               done-gpios = <&gpio0 9 GPIO_ACTIVE_HIGH>;
+               prog_b-gpios = <&gpio0 29 GPIO_ACTIVE_LOW>;
+       };
--

2.7.4