linux-kernel - Re: [PATCH net-next v3 2/8] net: dsa: vsc73xx: convert to PHYLINK

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Date:   Wed, 4 Oct 2023 00:14:09 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Paweł Dembicki <paweldembicki@...il.com>
Cc:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        netdev@...r.kernel.org, Dan Carpenter <dan.carpenter@...aro.org>,
        Simon Horman <simon.horman@...igine.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 2/8] net: dsa: vsc73xx: convert to PHYLINK

Hi Paweł,

On Tue, Oct 03, 2023 at 10:45:45PM +0200, Paweł Dembicki wrote:
> I plan to make rgmii delays configurable from the device tree. Should I?
> a. switch to phy_interface_is_rgmii in the current patch?
> b. add another patch in this series?
> c. wait with change to phy_interface_is_rgmii for patch with rgmii
> delays configuration?

If you want to configure the RGMII delays in the vsc73xx MAC, you should
look at the "rx-internal-delay-ps" and "tx-internal-delay-ps" properties
in the MAC OF node, rather than at the phy-mode. The phy-mode is for the
internal delays from the PHY.

In any case, you should accept any phy_interface_is_rgmii() regardless
of whether internal delays are configurable in the MAC. And yes, parsing
those MAC OF properties should be a separate change.

If the series exceeds 15 patches, I would consider splitting it per
topic and submitting separate series (link management would be one,
tag_8021q/bridging/VLAN would be another). If they don't conflict and
can be applied independently, you could also send the 2 series
simultaneously.