mdio.yaml

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    1 # SPDX-License-Identifier: GPL-2.0
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/net/mdio.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: MDIO Bus Generic Binding
    8 
    9 maintainers:
   10   - Andrew Lunn <andrew@lunn.ch>
   11   - Florian Fainelli <f.fainelli@gmail.com>
   12   - Heiner Kallweit <hkallweit1@gmail.com>
   13 
   14 description:
   15   These are generic properties that can apply to any MDIO bus. Any
   16   MDIO bus must have a list of child nodes, one per device on the
   17   bus. These should follow the generic ethernet-phy.yaml document, or
   18   a device specific binding document.
   19 
   20 properties:
   21   $nodename:
   22     pattern: "^mdio(@.*)?"
   23 
   24   "#address-cells":
   25     const: 1
   26 
   27   "#size-cells":
   28     const: 0
   29 
   30   reset-gpios:
   31     maxItems: 1
   32     description:
   33       The phandle and specifier for the GPIO that controls the RESET
   34       lines of all devices on that MDIO bus.
   35 
   36   reset-delay-us:
   37     description:
   38       RESET pulse width in microseconds. It applies to all MDIO devices
   39       and must therefore be appropriately determined based on all devices
   40       requirements (maximum value of all per-device RESET pulse widths).
   41 
   42   reset-post-delay-us:
   43     description:
   44       Delay after reset deassert in microseconds. It applies to all MDIO
   45       devices and it's determined by how fast all devices are ready for
   46       communication. This delay happens just before e.g. Ethernet PHY
   47       type ID auto detection.
   48 
   49   clock-frequency:
   50     description:
   51       Desired MDIO bus clock frequency in Hz. Values greater than IEEE 802.3
   52       defined 2.5MHz should only be used when all devices on the bus support
   53       the given clock speed.
   54 
   55   suppress-preamble:
   56     description:
   57       The 32 bit preamble should be suppressed. In order for this to
   58       work, all devices on the bus must support suppressed preamble.
   59     type: boolean
   60 
   61 patternProperties:
   62   '@[0-9a-f]+$':
   63     type: object
   64 
   65     properties:
   66       reg:
   67         minimum: 0
   68         maximum: 31
   69         description:
   70           The ID number for the device.
   71 
   72       broken-turn-around:
   73         $ref: /schemas/types.yaml#/definitions/flag
   74         description:
   75           If set, indicates the MDIO device does not correctly release
   76           the turn around line low at end of the control phase of the
   77           MDIO transaction.
   78 
   79       reset-gpios:
   80         maxItems: 1
   81         description:
   82           The GPIO phandle and specifier for the MDIO reset signal.
   83 
   84       reset-assert-us:
   85         description:
   86           Delay after the reset was asserted in microseconds. If this
   87           property is missing the delay will be skipped.
   88 
   89       reset-deassert-us:
   90         description:
   91           Delay after the reset was deasserted in microseconds. If
   92           this property is missing the delay will be skipped.
   93 
   94     required:
   95       - reg
   96 
   97 additionalProperties: true
   98 
   99 examples:
  100   - |
  101     davinci_mdio: mdio@5c030000 {
  102         reg = <0x5c030000 0x1000>;
  103         #address-cells = <1>;
  104         #size-cells = <0>;
  105 
  106         reset-gpios = <&gpio2 5 1>;
  107         reset-delay-us = <2>;
  108 
  109         ethphy0: ethernet-phy@1 {
  110             reg = <1>;
  111         };
  112 
  113         ethphy1: ethernet-phy@3 {
  114             reg = <3>;
  115         };
  116     };

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