From: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Altera FPGAs that are programmed via SPI use the passive serial protocol.
Add a simple binding that describes the setup for this usecase.
Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Signed-off-by: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
---
.../bindings/firmware/altr,passive-serial.txt | 24 ++++++++++++++++++++++
1 file changed, 24 insertions(+)
create mode 100644 Documentation/devicetree/bindings/firmware/altr,passive-serial.txt
diff --git a/Documentation/devicetree/bindings/firmware/altr,passive-serial.txt b/Documentation/devicetree/bindings/firmware/altr,passive-serial.txt
new file mode 100644
index 000000000000..d357dd39cf67
--- /dev/null
+++ b/Documentation/devicetree/bindings/firmware/altr,passive-serial.txt
@@ -0,0 +1,24 @@
+Altera FPGAs in passive serial mode
+-----------------------------------
+
+This binding defines the control interface to Altera FPGAs in
+passive serial mode. This is used to upload the firmware and
+to start the FPGA.
+
+Required properties:
+- compatible: shall be "altr,fpga-passive-serial"
+- reg: SPI chip select
+- nstat-gpios: Specify GPIO for controlling the nstat pin
+- confd-gpios: Specify GPIO for controlling the confd pin
+- nconfig-gpios: Specify GPIO for controlling the nconfig pin
+
+Example:
+
+ fpga@0 {
+ compatible = "altr,fpga-passive-serial";
+ nstat-gpios = <&gpio4 18 0>;
+ confd-gpios = <&gpio4 19 0>;
+ nconfig-gpios = <&gpio4 20 0>;
+ spi-max-frequency = <10000000>;
+ reg = <0>;
+ };
--
2.1.0
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