Add binding documentation for the Technologic Systems NBUS that is used
to interface with peripherals in the FPGA of the TS-4600 SoM.
Signed-off-by: Sebastien Bourdelin <sebastien.bourdelin@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/devicetree/bindings/bus/ts-nbus.txt | 50 +++++++++++++++++++++++
1 file changed, 50 insertions(+)
create mode 100644 Documentation/devicetree/bindings/bus/ts-nbus.txt
diff --git a/Documentation/devicetree/bindings/bus/ts-nbus.txt b/Documentation/devicetree/bindings/bus/ts-nbus.txt
new file mode 100644
index 0000000..2f777ee
--- /dev/null
+++ b/Documentation/devicetree/bindings/bus/ts-nbus.txt
@@ -0,0 +1,50 @@
+Technologic Systems NBUS
+
+The NBUS is a bus used to interface with peripherals in the Technologic
+Systems FPGA on the TS-4600 SoM.
+
+Required properties :
+ - compatible : "technologic,ts-nbus", "simple-bus"
+ - #address-cells : must be 1
+ - #size-cells : must be 0
+ - pws : The PWM pin connected to the clock line on the FPGA
+ - data-gpios : The GPIO pin connected to the data line on the FPGA
+ - csn-gpios : The GPIO pin connected to the csn line on the FPGA
+ - txrx-gpios : The GPIO pin connected to the txrx line on the FPGA
+ - strobe-gpios : The GPIO pin connected to the stobe line on the FPGA
+ - ale-gpios : The GPIO pin connected to the ale line on the FPGA
+ - rdy-gpios : The GPIO pin connected to the rdy line on the FPGA
+
+Child nodes:
+
+The NBUS node can contain zero or more child nodes representing peripherals
+on the bus.
+
+Example:
+
+ nbus {
+ compatible = "technologic,ts-nbus", "simple-bus";
+ pinctrl-0 = <&nbus_pins>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ pwms = <&pwm 2 83>;
+ data-gpios = <&gpio0 0 GPIO_ACTIVE_HIGH
+ &gpio0 1 GPIO_ACTIVE_HIGH
+ &gpio0 2 GPIO_ACTIVE_HIGH
+ &gpio0 3 GPIO_ACTIVE_HIGH
+ &gpio0 4 GPIO_ACTIVE_HIGH
+ &gpio0 5 GPIO_ACTIVE_HIGH
+ &gpio0 6 GPIO_ACTIVE_HIGH
+ &gpio0 7 GPIO_ACTIVE_HIGH>;
+ csn-gpios = <&gpio0 16 GPIO_ACTIVE_HIGH>;
+ txrx-gpios = <&gpio0 24 GPIO_ACTIVE_HIGH>;
+ strobe-gpios = <&gpio0 25 GPIO_ACTIVE_HIGH>;
+ ale-gpios = <&gpio0 26 GPIO_ACTIVE_HIGH>;
+ rdy-gpios = <&gpio0 21 GPIO_ACTIVE_HIGH>;
+
+ wdt@2a {
+ compatible = "...";
+
+ /* ... */
+ };
+ };
--
2.10.2
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