diff mbox series

[net-next,v3,1/2] dt-bindings: net: ipq4019-mdio: document now supported clock-frequency

Message ID 20240131022606.1532-2-ansuelsmth@gmail.com (mailing list archive)
State Not Applicable
Headers show
Series net: mdio-ipq4019: fix wrong default MDC rate | expand

Commit Message

Christian Marangi Jan. 31, 2024, 2:26 a.m. UTC 
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@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
 .../bindings/net/qcom,ipq4019-mdio.yaml           | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
diff mbox series

Patch

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