diff mbox series

[net-next,v2,1/3] dt-bindings: net: ipq4019-mdio: document now supported clock-frequency

Message ID 20240130003546.1546-2-ansuelsmth@gmail.com
State New
Headers
Series net: mdio-ipq4019: fix wrong default MDC rate |

Commit Message

Christian Marangi Jan. 30, 2024, 12:35 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>
---
 .../bindings/net/qcom,ipq4019-mdio.yaml           | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

Comments

Andrew Lunn Jan. 30, 2024, 12:49 a.m. UTC | #1 
On Tue, Jan 30, 2024 at 01:35:20AM +0100, Christian Marangi wrote:
> 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>

    Andrew
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