Commit 9484b955 authored by Christian Marangi's avatar Christian Marangi Committed by David S. Miller
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dt-bindings: net: ipq4019-mdio: document now supported clock-frequency 



Document support for clock-frequency and add details on why this
property is needed and what values are supported.

From internal documentation, while other values are supported, the
correct function of the MDIO bus is not assured hence add only the
suggested supported values to the property enum.

Signed-off-by: default avatarChristian Marangi <ansuelsmth@gmail.com>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 747056a9

Documentation/devicetree/bindings/net/qcom,ipq4019-mdio.yaml

+15 −0
Original line number Diff line number Diff line
@@ -44,6 +44,21 @@ properties: 
    items:

      - const: gcc_mdio_ahb_clk



  clock-frequency:

    description:

      The MDIO bus clock that must be output by the MDIO bus hardware, if

      absent, the default hardware values are used.



      MDC rate is feed by an external clock (fixed 100MHz) and is divider

      internally. The default divider is /256 resulting in the default rate

      applied of 390KHz.



      To follow 802.3 standard that instruct up to 2.5MHz by default, if

      this property is not declared and the divider is set to /256, by

      default 1.5625Mhz is select.

    enum: [ 390625, 781250, 1562500, 3125000, 6250000, 12500000 ]

    default: 1562500



required:

  - compatible

  - reg