linux-kernel - [PATCH net-next v2 2/3] dt-bindings: mscc: Add RGMII RX and TX delay tuning

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Message-ID: <20230426104313.28950-3-harini.katakam@amd.com>
Date:   Wed, 26 Apr 2023 16:13:12 +0530
From:   Harini Katakam <harini.katakam@....com>
To:     <robh+dt@...nel.org>, <andrew@...n.ch>, <hkallweit1@...il.com>,
        <linux@...linux.org.uk>, <davem@...emloft.net>, <kuba@...nel.org>,
        <edumazet@...gle.com>, <pabeni@...hat.com>,
        <vladimir.oltean@....com>, <wsa+renesas@...g-engineering.com>,
        <krzysztof.kozlowski+dt@...aro.org>, <simon.horman@...igine.com>
CC:     <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <harinikatakamlinux@...il.com>,
        <michal.simek@....com>, <harini.katakam@....com>,
        <radhey.shyam.pandey@....com>
Subject: [PATCH net-next v2 2/3] dt-bindings: mscc: Add RGMII RX and TX delay tuning

From: Harini Katakam <harini.katakam@...inx.com>

Add optional properties to tune RGMII RX and TX delay. The current
default value in the Linux driver, when the phy-mode is rgmii-id,
is 2ns for both. These properties take priority if specified.

Signed-off-by: Harini Katakam <harini.katakam@....com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
Signed-off-by: Michal Simek <michal.simek@...inx.com>
---
v2:
- Updated DT binding description and commit for optional delay tuning
to be clearer on the precedence
- Updated dt property name to include vendor instead of phy device name

 Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt b/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt
index 0a3647fe331b..2b779bc3096b 100644
--- a/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt
+++ b/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt
@@ -33,6 +33,8 @@ Optional properties:
 			  VSC8531_DUPLEX_COLLISION (8).
 - load-save-gpios	: GPIO used for the load/save operation of the PTP
 			  hardware clock (PHC).
+- mscc,rx-delay		: RGMII RX delay. Allowed values are 0.2 - 3.4 ns.
+- mscc,tx-delay		: RGMII TX delay. Allowed values are 0.2 - 3.4 ns.
 
 
 Table: 1 - Edge rate change
-- 
2.17.1