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Date: Wed, 1 Nov 2017 13:14:32 -0400 From: Sebastien Bourdelin <sebastien.bourdelin@...oirfairelinux.com> To: linux-kernel@...r.kernel.org, kernel@...oirfairelinux.com, robh@...nel.org, linus.walleij@...aro.org, devicetree@...r.kernel.org, linux@...ck-us.net, fabio.estevam@....com Cc: mark@...eddedarm.com, kris@...eddedarm.com, Sebastien Bourdelin <sebastien.bourdelin@...oirfairelinux.com> Subject: [PATCH v7 1/2] 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@...oirfairelinux.com> Acked-by: Linus Walleij <linus.walleij@...aro.org> Acked-by: Rob Herring <robh@...nel.org> --- Changes v6 -> v7: - rebase on master - add missing ack from Rob Herring on v4 (no changes done since) Changes v5 -> v6: - rebase on master - split the previous patch series into series by subsystem - add ack by Linus Walleij Changes v4 -> v5: - fix missing signed off Changes v3 -> v4: - rebase on master - fix vendor prefixes for dts properties (suggested by Rob Herring) - v3 was acked by Linus Walleij Changes v2 -> v3: - rebase on master - fix typo (suggested by Rob Herring) 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) --- 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 000000000000..2a10d065b9fa --- /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 + - 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 = "..."; + + /* ... */ + }; + }; -- 2.13.4
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