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    Subject[PATCH v3 bus+gpio 2/5] dt-bindings: bus: Document moxtet bus binding
    Date
    This adds device tree binding documentation for the Moxtet bus, a bus
    via which the different modules connected to the Turris Mox router can
    be configured.

    Signed-off-by: Marek Behún <marek.behun@nic.cz>
    Cc: Rob Herring <robh+dt@kernel.org>
    Cc: devicetree@vger.kernel.org
    ---
    .../devicetree/bindings/bus/moxtet.txt | 36 +++++++++++++++++++
    1 file changed, 36 insertions(+)
    create mode 100644 Documentation/devicetree/bindings/bus/moxtet.txt

    diff --git a/Documentation/devicetree/bindings/bus/moxtet.txt b/Documentation/devicetree/bindings/bus/moxtet.txt
    new file mode 100644
    index 000000000000..2bb998cbd3ad
    --- /dev/null
    +++ b/Documentation/devicetree/bindings/bus/moxtet.txt
    @@ -0,0 +1,36 @@
    +Turris Mox module configuration bus (over SPI)
    +
    +Required properties:
    + - compatible : Should be "cznic,moxtet".
    + - #address-cells : Has to be 1
    + - #size-cells : Has to be 0
    + - spi-cpol : Required inverted clock polarity
    + - spi-cpha : Required shifted clock phase
    +For other required and optional properties of SPI slave nodes please refer to
    +../spi/spi-bus.txt.
    +
    +Required properties of subnodes:
    + - reg : Should be position on the Moxtet bus
    +
    +The driver finds the devices connected to the bus by itself, but it may be
    +needed to reference some of them from other parts of the device tree. In that
    +case the devices can be defined as subnodes of the moxtet node.
    +
    +Example:
    +
    + moxtet@1 {
    + #address-cells = <1>;
    + #size-cells = <0>;
    + compatible = "cznic,moxtet";
    + reg = <1>;
    + spi-max-frequency = <10000000>;
    + spi-cpol;
    + spi-cpha;
    +
    + moxtet_sfp: gpio@0 {
    + compatible = "cznic,moxtet-sfp";
    + gpio-controller;
    + #gpio-cells = <2>;
    + reg = <0>;
    + }
    + };
    --
    2.19.2
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