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

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Message-ID: <620ce8e6-2b40-1322-364a-0099a6e2af26@kernel.org>
Date:   Mon, 2 Jan 2023 15:04:19 +0200
From:   Roger Quadros <rogerq@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>, MD Danish Anwar <danishanwar@...com>
Cc:     "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 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.

> 
>      Andrew

cheers,
-roger