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 <ansuelsmth@xxxxxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
---
.../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
--
2.43.0
