From 9484b9555de04ed16952dda6518b324f61a6fd6a Mon Sep 17 00:00:00 2001 From: Christian Marangi Date: Wed, 31 Jan 2024 03:26:03 +0100 Subject: [PATCH] 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: Christian Marangi Reviewed-by: Andrew Lunn Signed-off-by: David S. Miller --- .../bindings/net/qcom,ipq4019-mdio.yaml | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/Documentation/devicetree/bindings/net/qcom,ipq4019-mdio.yaml b/Documentation/devicetree/bindings/net/qcom,ipq4019-mdio.yaml index 3407e909e8a7..0029e197a825 100644 --- a/Documentation/devicetree/bindings/net/qcom,ipq4019-mdio.yaml +++ b/Documentation/devicetree/bindings/net/qcom,ipq4019-mdio.yaml @@ -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