netdev - Re: [net-next PATCH 10/13] net: dsa: qca8k: add explicit SGMII PLL enable

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Message-ID: <YV4/ehy9aYJyozvy@lunn.ch>
Date:   Thu, 7 Oct 2021 02:29:46 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH 10/13] net: dsa: qca8k: add explicit SGMII PLL
 enable

On Thu, Oct 07, 2021 at 12:36:00AM +0200, Ansuel Smith wrote:
> Support enabling PLL on the SGMII CPU port. Some device require this
> special configuration or no traffic is transmitted and the switch
> doesn't work at all. A dedicated binding is added to the CPU node
> port to apply the correct reg on mac config.

Why not just enable this all the time when the CPU port is in SGMII
mode?

Is it also needed for 1000BaseX?

DT properties like this are hard to use. It would be better if the
switch can decide for itself if it needs the PLL enabled.

       Andrew