FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/pinctrl/berlin,pinctrl.txt

     * Pin-controller driver for the Marvell Berlin SoCs
     
     Pin control registers are part of both chip controller and system
     controller register sets. Pin controller nodes should be a sub-node of
     either the chip controller or system controller node. The pins
     controlled are organized in groups, so no actual pin information is
     needed.
     
     A pin-controller node should contain subnodes representing the pin group
    configurations, one per function. Each subnode has the group name and
    the muxing function used.
    
    Be aware the Marvell Berlin datasheets use the keyword 'mode' for what
    is called a 'function' in the pin-controller subsystem.
    
    Required properties:
    - compatible: should be one of:
            "marvell,berlin2-soc-pinctrl",
            "marvell,berlin2-system-pinctrl",
            "marvell,berlin2cd-soc-pinctrl",
            "marvell,berlin2cd-system-pinctrl",
            "marvell,berlin2q-soc-pinctrl",
            "marvell,berlin2q-system-pinctrl",
            "marvell,berlin4ct-avio-pinctrl",
            "marvell,berlin4ct-soc-pinctrl",
            "marvell,berlin4ct-system-pinctrl",
            "syna,as370-soc-pinctrl"
    
    Required subnode-properties:
    - groups: a list of strings describing the group names.
    - function: a string describing the function used to mux the groups.
    
    Example:
    
    sys_pinctrl: pin-controller {
            compatible = "marvell,berlin2q-system-pinctrl";
    
            uart0_pmux: uart0-pmux {
                    groups = "GSM12";
                    function = "uart0";
            };
    };
    
    &uart0 {
            pinctrl-0 = <&uart0_pmux>;
            pinctrl-names = "default";
    };

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