linux-kernel - Re: [PATCH net-next v2 3/3] phy: mscc: Add support for VSC8531

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Message-ID: <2bbbe874-2879-4b1a-bf79-2d5c1a7a35f4@lunn.ch>
Date:   Wed, 26 Apr 2023 15:48:24 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Harini Katakam <harini.katakam@....com>
Cc:     robh+dt@...nel.org, 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,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, harinikatakamlinux@...il.com,
        michal.simek@....com, radhey.shyam.pandey@....com
Subject: Re: [PATCH net-next v2 3/3] phy: mscc: Add support for VSC8531_02
 with RGMII tuning

On Wed, Apr 26, 2023 at 04:13:13PM +0530, Harini Katakam wrote:
> From: Harini Katakam <harini.katakam@...inx.com>
> 
> Add support for VSC8531_02 (Rev 2) device.
> Add support for optional RGMII RX and TX delay tuning via devicetree.
> The hierarchy is:
> - Retain the defaul 0.2ns delay when RGMII tuning is not set.
> - Retain the default 2ns delay when RGMII tuning is set and DT delay
> property is NOT specified.

tuning is probably the wrong word here. I normally consider tuning as
small changes from 0ns/2ns. The course setting of 0ns or 2ns is not
tuning. I normally use RGMII internal delays to refer to that.

However, i'm not sure there is consistency among drivers.

	 Andrew