netdev - Re: [PATCH net-next v2 1/5] dt-bindings: net: Add Motorcomm yt8xxx ethernet phy

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Message-ID: <Y9U5074l5esHT9Jg@lunn.ch>
Date:   Sat, 28 Jan 2023 16:05:55 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Frank Sae <Frank.Sae@...or-comm.com>
Cc:     Peter Geis <pgwipeout@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, xiaogang.fan@...or-comm.com,
        fei.zhang@...or-comm.com, hua.sun@...or-comm.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 1/5] dt-bindings: net: Add Motorcomm yt8xxx
 ethernet phy

> +properties:
> +  rx-internal-delay-ps:
> +    description: |
> +      RGMII RX Clock Delay used only when PHY operates in RGMII mode with
> +      internal delay (phy-mode is 'rgmii-id' or 'rgmii-rxid') in pico-seconds.
> +    enum: [ 0, 150, 300, 450, 600, 750, 900, 1050, 1200, 1350, 1500, 1650,
> +            1800, 1900, 1950, 2050, 2100, 2200, 2250, 2350, 2500, 2650, 2800,
> +            2950, 3100, 3250, 3400, 3550, 3700, 3850, 4000, 4150 ]
> +    default: 1900
> +
> +  tx-internal-delay-ps:
> +    description: |
> +      RGMII TX Clock Delay used only when PHY operates in RGMII mode with
> +      internal delay (phy-mode is 'rgmii-id' or 'rgmii-txid') in pico-seconds.
> +    enum: [ 0, 150, 300, 450, 600, 750, 900, 1050, 1200, 1350, 1500, 1650, 1800,
> +            1950, 2100, 2250 ]
> +    default: 150

That is an odd default to choose. rgmii-id or rgmii-txid means the PHY
should be added around 2ns of delay. So a default of 1950 makes more
sense.

	Andrew