linux-kernel - Re: [PATCH v3 1/2] dt-bindings: net: Add ICSSG Ethernet Driver bindings

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Message-ID: <Y7Mjx8ZEVEcU2mK8@lunn.ch>
Date:   Mon, 2 Jan 2023 19:34:47 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Roger Quadros <rogerq@...nel.org>
Cc:     MD Danish Anwar <danishanwar@...com>,
        "Andrew F. Davis" <afd@...com>, Tero Kristo <t-kristo@...com>,
        Suman Anna <s-anna@...com>, YueHaibing <yuehaibing@...wei.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>, nm@...com,
        ssantosh@...nel.org, srk@...com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 1/2] dt-bindings: net: Add ICSSG Ethernet Driver
 bindings

On Mon, Jan 02, 2023 at 03:04:19PM +0200, Roger Quadros wrote:
> 
> 
> On 23/12/2022 16:28, Andrew Lunn wrote:
> >> +        ethernet-ports {
> >> +            #address-cells = <1>;
> >> +            #size-cells = <0>;
> >> +            pruss2_emac0: port@0 {
> >> +                reg = <0>;
> >> +                phy-handle = <&pruss2_eth0_phy>;
> >> +                phy-mode = "rgmii-rxid";
> > 
> > That is unusual. Where are the TX delays coming from?
> 
> >From the below property
> 
> +                ti,syscon-rgmii-delay = <&scm_conf 0x4120>;
> 
> The TX delay can be enabled/disabled from within the ICSSG block.
> 
> If this property exists and PHY mode is neither PHY_INTERFACE_MODE_RGMII_ID
> nor PHY_INTERFACE_MODE_RGMII_TXID then the internal delay is enabled.
> 
> This logic is in prueth_config_rgmiidelay() function in the introduced driver.

What nearly every other MAC driver does is pass the phy-mode to the
PHY and lets the PHY add the delays. I would recommend you do that,
rather than be special and different.

       Andrew