From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752260AbdEETdR (ORCPT ); Fri, 5 May 2017 15:33:17 -0400 Received: from mail.savoirfairelinux.com ([208.88.110.44]:44744 "EHLO mail.savoirfairelinux.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751536AbdEETdN (ORCPT ); Fri, 5 May 2017 15:33:13 -0400 From: Sebastien Bourdelin To: linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, kernel@savoirfairelinux.com, robh@kernel.org, linux@roeck-us.net, linus.walleij@linaro.org, shawnguo@kernel.org Cc: fabio.estevam@nxp.com, mark@embeddedarm.com, kris@embeddedarm.com, Sebastien Bourdelin Subject: [PATCH v3 3/6] dt-bindings: bus: Add documentation for the Technologic Systems NBUS Date: Fri, 5 May 2017 15:32:56 -0400 Message-Id: <20170505193259.16517-4-sebastien.bourdelin@savoirfairelinux.com> X-Mailer: git-send-email 2.12.0 In-Reply-To: <20170505193259.16517-1-sebastien.bourdelin@savoirfairelinux.com> References: <20170505193259.16517-1-sebastien.bourdelin@savoirfairelinux.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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..905600adfb64 --- /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 = "..."; + + /* ... */ + }; + }; -- 2.12.0