linux-kernel - [PATCH v2 1/2] dt-bindings: net: dp83826: support TX data voltage tuning

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Date: Wed,  7 Feb 2024 18:58:44 +0100
From: Catalin Popescu <catalin.popescu@...ca-geosystems.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org,
	afd@...com,
	andrew@...n.ch,
	hkallweit1@...il.com,
	linux@...linux.org.uk
Cc: netdev@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bsp-development.geo@...ca-geosystems.com,
	m.felsch@...gutronix.de,
	Catalin Popescu <catalin.popescu@...ca-geosystems.com>
Subject: [PATCH v2 1/2] dt-bindings: net: dp83826: support TX data voltage tuning

Add properties ti,cfg-dac-minus-one-milli-percent and
ti,cfg-dac-plus-one-milli-percent to support voltage tuning
of logical levels -1/+1 of the MLT-3 encoded TX data.

Signed-off-by: Catalin Popescu <catalin.popescu@...ca-geosystems.com>
---
Changes in v2:
 - squash the 2 DT bindings patches in one single patch
 - drop redundant "binding" from the DT bindings patch title
 - rename DT properties and define them as percentage
 - add default value for each new DT property
---
 .../devicetree/bindings/net/ti,dp83822.yaml    | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/ti,dp83822.yaml b/Documentation/devicetree/bindings/net/ti,dp83822.yaml
index db74474207ed..6bbd465e51d6 100644
--- a/Documentation/devicetree/bindings/net/ti,dp83822.yaml
+++ b/Documentation/devicetree/bindings/net/ti,dp83822.yaml
@@ -62,6 +62,24 @@ properties:
        for the PHY.  The internal delay for the PHY is fixed to 3.5ns relative
        to transmit data.
 
+  ti,cfg-dac-minus-one-milli-percent:
+    description: |
+       DP83826 PHY only.
+       Sets the voltage ratio (with respect to the nominal value)
+       of the logical level -1 for the MLT-3 encoded TX data.
+    enum: [50000, 56250, 62500, 68750, 75000, 81250, 87500, 93750, 100000,
+           106250, 112500, 118750, 125000, 131250, 137500, 143750, 150000]
+    default: 100000
+
+  ti,cfg-dac-plus-one-milli-percent:
+    description: |
+       DP83826 PHY only.
+       Sets the voltage ratio (with respect to the nominal value)
+       of the logical level +1 for the MLT-3 encoded TX data.
+    enum: [50000, 56250, 62500, 68750, 75000, 81250, 87500, 93750, 100000,
+           106250, 112500, 118750, 125000, 131250, 137500, 143750, 150000]
+    default: 100000
+
 required:
   - reg
 

base-commit: 6d280f4d760e3bcb4a8df302afebf085b65ec982
prerequisite-patch-id: 0000000000000000000000000000000000000000
-- 
2.34.1