Re: [PATCH 3/6] dt-bindings: bus: Add documentation for the Technologic Systems NBUS
From: Rob Herring <hidden>
Date: 2016-12-19 22:12:52
Also in:
linux-arm-kernel, linux-watchdog, lkml
On Wed, Dec 14, 2016 at 06:12:33PM -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. Signed-off-by: Sebastien Bourdelin <sebastien.bourdelin-4ysUXcep3aM1wj+D4I0NRVaTQe2KTcn/@public.gmane.org> --- 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 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
Using PWM binding?
+ - 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
These all need vendor prefix. This is not any sort of standard bus?
+
+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";I don't think simple-bus is really valid here. Don't you need the nbus driver before the devices are usable?
+ 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 {watchdog@...
+ compatible = "..."; + + /* ... */ + }; + }; -- 2.10.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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