FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/net/mdio-mux-meson-g12a.txt

     Properties for the MDIO bus multiplexer/glue of Amlogic G12a SoC family.
     
     This is a special case of a MDIO bus multiplexer. It allows to choose between
     the internal mdio bus leading to the embedded 10/100 PHY or the external
     MDIO bus.
     
     Required properties in addition to the generic multiplexer properties:
     - compatible : amlogic,g12a-mdio-mux
     - reg: physical address and length of the multiplexer/glue registers
    - clocks: list of clock phandle, one for each entry clock-names.
    - clock-names: should contain the following:
      * "pclk"   : peripheral clock.
      * "clkin0" : platform crytal
      * "clkin1" : SoC 50MHz MPLL
    
    Example :
    
    mdio_mux: mdio-multiplexer@4c000 {
            compatible = "amlogic,g12a-mdio-mux";
            reg = <0x0 0x4c000 0x0 0xa4>;
            clocks = <&clkc CLKID_ETH_PHY>,
                     <&xtal>,
                     <&clkc CLKID_MPLL_5OM>;
            clock-names = "pclk", "clkin0", "clkin1";
            mdio-parent-bus = <&mdio0>;
            #address-cells = <1>;
            #size-cells = <0>;
    
            ext_mdio: mdio@0 {
                    reg = <0>;
                    #address-cells = <1>;
                    #size-cells = <0>;
            };
    
            int_mdio: mdio@1 {
                    reg = <1>;
                    #address-cells = <1>;
                    #size-cells = <0>;
    
                    internal_ephy: ethernet-phy@8 {
                            compatible = "ethernet-phy-id0180.3301",
                                         "ethernet-phy-ieee802.3-c22";
                            interrupts = <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>;
                            reg = <8>;
                            max-speed = <100>;
                    };
            };
    };

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