Documentation/devicetree/bindings/net/mdio-mux.txt

   1 Common MDIO bus multiplexer/switch properties.
   2
   3 An MDIO bus multiplexer/switch will have several child busses that are
   4 numbered uniquely in a device dependent manner.  The nodes for an MDIO
   5 bus multiplexer/switch will have one child node for each child bus.
   6
   7 Required properties:
   8 - #address-cells = <1>;
   9 - #size-cells = <0>;
  10
  11 Optional properties:
  12 - mdio-parent-bus : phandle to the parent MDIO bus.
  13
  14 - Other properties specific to the multiplexer/switch hardware.
  15
  16 Required properties for child nodes:
  17 - #address-cells = <1>;
  18 - #size-cells = <0>;
  19 - reg : The sub-bus number.
  20
  21
  22 Example :
  23
  24         /* The parent MDIO bus. */
  25         smi1: mdio@1180000001900 {
  26                 compatible = "cavium,octeon-3860-mdio";
  27                 #address-cells = <1>;
  28                 #size-cells = <0>;
  29                 reg = <0x11800 0x00001900 0x0 0x40>;
  30         };
  31
  32         /*
  33            An NXP sn74cbtlv3253 dual 1-of-4 switch controlled by a
  34            pair of GPIO lines.  Child busses 2 and 3 populated with 4
  35            PHYs each.
  36          */
  37         mdio-mux {
  38                 compatible = "mdio-mux-gpio";
  39                 gpios = <&gpio1 3 0>, <&gpio1 4 0>;
  40                 mdio-parent-bus = <&smi1>;
  41                 #address-cells = <1>;
  42                 #size-cells = <0>;
  43
  44                 mdio@2 {
  45                         reg = <2>;
  46                         #address-cells = <1>;
  47                         #size-cells = <0>;
  48
  49                         phy11: ethernet-phy@1 {
  50                                 reg = <1>;
  51                                 marvell,reg-init = <3 0x10 0 0x5777>,
  52                                         <3 0x11 0 0x00aa>,
  53                                         <3 0x12 0 0x4105>,
  54                                         <3 0x13 0 0x0a60>;
  55                                 interrupt-parent = <&gpio>;
  56                                 interrupts = <10 8>; /* Pin 10, active low */
  57                         };
  58                         phy12: ethernet-phy@2 {
  59                                 reg = <2>;
  60                                 marvell,reg-init = <3 0x10 0 0x5777>,
  61                                         <3 0x11 0 0x00aa>,
  62                                         <3 0x12 0 0x4105>,
  63                                         <3 0x13 0 0x0a60>;
  64                                 interrupt-parent = <&gpio>;
  65                                 interrupts = <10 8>; /* Pin 10, active low */
  66                         };
  67                         phy13: ethernet-phy@3 {
  68                                 reg = <3>;
  69                                 marvell,reg-init = <3 0x10 0 0x5777>,
  70                                         <3 0x11 0 0x00aa>,
  71                                         <3 0x12 0 0x4105>,
  72                                         <3 0x13 0 0x0a60>;
  73                                 interrupt-parent = <&gpio>;
  74                                 interrupts = <10 8>; /* Pin 10, active low */
  75                         };
  76                         phy14: ethernet-phy@4 {
  77                                 reg = <4>;
  78                                 marvell,reg-init = <3 0x10 0 0x5777>,
  79                                         <3 0x11 0 0x00aa>,
  80                                         <3 0x12 0 0x4105>,
  81                                         <3 0x13 0 0x0a60>;
  82                                 interrupt-parent = <&gpio>;
  83                                 interrupts = <10 8>; /* Pin 10, active low */
  84                         };
  85                 };
  86
  87                 mdio@3 {
  88                         reg = <3>;
  89                         #address-cells = <1>;
  90                         #size-cells = <0>;
  91
  92                         phy21: ethernet-phy@1 {
  93                                 reg = <1>;
  94                                 marvell,reg-init = <3 0x10 0 0x5777>,
  95                                         <3 0x11 0 0x00aa>,
  96                                         <3 0x12 0 0x4105>,
  97                                         <3 0x13 0 0x0a60>;
  98                                 interrupt-parent = <&gpio>;
  99                                 interrupts = <12 8>; /* Pin 12, active low */
 100                         };
 101                         phy22: ethernet-phy@2 {
 102                                 reg = <2>;
 103                                 marvell,reg-init = <3 0x10 0 0x5777>,
 104                                         <3 0x11 0 0x00aa>,
 105                                         <3 0x12 0 0x4105>,
 106                                         <3 0x13 0 0x0a60>;
 107                                 interrupt-parent = <&gpio>;
 108                                 interrupts = <12 8>; /* Pin 12, active low */
 109                         };
 110                         phy23: ethernet-phy@3 {
 111                                 reg = <3>;
 112                                 marvell,reg-init = <3 0x10 0 0x5777>,
 113                                         <3 0x11 0 0x00aa>,
 114                                         <3 0x12 0 0x4105>,
 115                                         <3 0x13 0 0x0a60>;
 116                                 interrupt-parent = <&gpio>;
 117                                 interrupts = <12 8>; /* Pin 12, active low */
 118                         };
 119                         phy24: ethernet-phy@4 {
 120                                 reg = <4>;
 121                                 marvell,reg-init = <3 0x10 0 0x5777>,
 122                                         <3 0x11 0 0x00aa>,
 123                                         <3 0x12 0 0x4105>,
 124                                         <3 0x13 0 0x0a60>;
 125                                 interrupt-parent = <&gpio>;
 126                                 interrupts = <12 8>; /* Pin 12, active low */
 127                         };
 128                 };
 129         };