[PATCH v2 3/6] dt-bindings: bus: Add documentation for the Technologic Systems NBUS
From: robh@kernel.org (Rob Herring)
Date: 2017-02-08 21:49:04
Also in:
linux-devicetree, linux-watchdog, lkml
On Fri, Feb 03, 2017 at 02:47:26PM -0500, Sebastien Bourdelin wrote:
quoted hunk ↗ jump to hunk
Add binding documentation for the Technologic Systems NBUS that is used to interface with peripherals in the FPGA of the TS-4600 SoM. --- Changes v1 -> v2: - rebase on master - remove the simple-bus compatibility as the root node will now populate child nodes (suggested by Rob Herring) - use the ts vendor prefix for gpios (suggested by Rob Herring) Signed-off-by: Sebastien Bourdelin <redacted> --- Documentation/devicetree/bindings/bus/ts-nbus.txt | 50 +++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 Documentation/devicetree/bindings/bus/ts-nbus.txtdiff --git a/Documentation/devicetree/bindings/bus/ts-nbus.txt b/Documentation/devicetree/bindings/bus/ts-nbus.txt new file mode 100644 index 000000000000..c8a1f2cbe6a0 --- /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" + - #address-cells : must be 1 + - #size-cells : must be 0 + - pws : The PWM binded to the FPGA
Should be pwms? s/binded/bound/
+ - data-gpios : The GPIO pin connected to the data line on the FPGA
lines? How many? Always 8 like the example?
+ - 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";
+ pinctrl-0 = <&nbus_pins>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ pwms = <&pwm 2 83>;
+ ts-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>;
+ ts-csn-gpios = <&gpio0 16 GPIO_ACTIVE_HIGH>;
+ ts-txrx-gpios = <&gpio0 24 GPIO_ACTIVE_HIGH>;
+ ts-strobe-gpios = <&gpio0 25 GPIO_ACTIVE_HIGH>;
+ ts-ale-gpios = <&gpio0 26 GPIO_ACTIVE_HIGH>;
+ ts-rdy-gpios = <&gpio0 21 GPIO_ACTIVE_HIGH>;
+
+ watchdog at 2a {
+ compatible = "...";
+
+ /* ... */
+ };
+ };
--
2.11.0