netdev - RE: [PATCH net-next v2 3/3] phy: mscc: Add support for VSC8531

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Date:   Wed, 26 Apr 2023 17:30:04 +0000
From:   "Katakam, Harini" <harini.katakam@....com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "vladimir.oltean@....com" <vladimir.oltean@....com>,
        "wsa+renesas@...g-engineering.com" <wsa+renesas@...g-engineering.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "simon.horman@...igine.com" <simon.horman@...igine.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "harinikatakamlinux@...il.com" <harinikatakamlinux@...il.com>,
        "Simek, Michal" <michal.simek@....com>,
        "Pandey, Radhey Shyam" <radhey.shyam.pandey@....com>
Subject: RE: [PATCH net-next v2 3/3] phy: mscc: Add support for VSC8531_02
 with RGMII tuning

Hi Andrew,

> -----Original Message-----
> From: Andrew Lunn <andrew@...n.ch>
> Sent: Wednesday, April 26, 2023 7:18 PM
> To: Katakam, Harini <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; Simek, Michal <michal.simek@....com>;
> Pandey, Radhey Shyam <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.

Thanks for the input, I understand. I'm planning on re-phrasing this
with phy-mode and property values to describe rather than say tuning.

Regards,
Harini