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dt-bindings: bus: Add documentation for the Technologic Systems NBUS 

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@savoirfairelinux.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Sebastien Bourdelin 2017-11-02 14:17:12 -04:00 committed by Arnd Bergmann
parent 1e11cbf720
commit ec473a9c40
1 changed files with 50 additions and 0 deletions
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Documentation/devicetree/bindings/bus/ts-nbus.txt Normal file
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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
- pwms : The PWM bound to the FPGA
- ts,data-gpios : The 8 GPIO pins connected to the data lines on the FPGA
- ts,csn-gpios : The GPIO pin connected to the csn line on the FPGA
- ts,txrx-gpios : The GPIO pin connected to the txrx line on the FPGA
- ts,strobe-gpios : The GPIO pin connected to the stobe line on the FPGA
- ts,ale-gpios : The GPIO pin connected to the ale line on the FPGA
- ts,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@2a {
compatible = "...";
/* ... */
};
};