netdev - Re: [PATCH] Documentation: devicetree: Add PHY no lane swap binding

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Message-ID: <20170204172329.GA8364@lunn.ch>
Date:   Sat, 4 Feb 2017 18:23:29 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Lukasz Majewski <lukma@...x.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        jbrunet <jbrunet@...libre.com>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Jon Mason <jon.mason@...adcom.com>,
        Fabio Estevam <fabio.estevam@....com>
Subject: Re: [PATCH] Documentation: devicetree: Add PHY no lane swap binding

On Sat, Feb 04, 2017 at 04:47:47PM +0100, Lukasz Majewski wrote:
> Add the documentation to avoid PHY lane swapping. This is a boolean
> entry to notify the phy device drivers that the TX/RX lanes NO need

that the TX/RX lanes should not be swapped.

> to be swapped.
> The use case for this binding mostly happens after wrong HW
> configuration of PHY IC during bootstrap.
> 
> Signed-off-by: Lukasz Majewski <lukma@...x.de>
> ---
>  Documentation/devicetree/bindings/net/phy.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/phy.txt b/Documentation/devicetree/bindings/net/phy.txt
> index fb5056b..5e25bc9 100644
> --- a/Documentation/devicetree/bindings/net/phy.txt
> +++ b/Documentation/devicetree/bindings/net/phy.txt
> @@ -39,6 +39,10 @@ Optional Properties:
>  - enet-phy-lane-swap: If set, indicates the PHY will swap the TX/RX lanes to
>    compensate for the board being designed with the lanes swapped.
>  
> +- enet-phy-lane-no-swap: If set, indicates that PHY will disable swap of the
> +  TX/RX lanes. This binding allows the PHY to work correcly after e.g. wrong
> +  bootstrap configuration caused by issues in PCB layout design.
> +

We are leaving it undefined what it means if neither
enet-phy-lane-no-swap nor enet-phy-lane-swap properties are present.
Do we want to define this? That the swap should be left untouched by
the driver?

    Andrew