netdev - Re: [PATCH net-next 2/2] net: phy: aquantia: add USXGMII support

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Message-ID: <20190522205851.GA15257@lunn.ch>
Date:   Wed, 22 May 2019 22:58:51 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Madalin-cristian Bucur <madalin.bucur@....com>,
        Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH net-next 2/2] net: phy: aquantia: add USXGMII support

On Wed, May 22, 2019 at 09:58:32PM +0200, Heiner Kallweit wrote:
> So far we didn't support mode USXGMII, and in order to not break the
> two Freescale boards mode XGMII was accepted for the AQR107 family
> even though it doesn't support XGMII. Add USXGMII support to the
> Aquantia PHY driver and change the phy connection type for the two
> boards.
> 
> As an additional note: Even though the handle is named aqr106
> there seem to be LS1046A boards with an AQR107.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> ---
>  arch/arm64/boot/dts/freescale/fsl-ls1043a-rdb.dts | 2 +-
>  arch/arm64/boot/dts/freescale/fsl-ls1046a-rdb.dts | 2 +-
>  drivers/net/phy/aquantia_main.c                   | 6 +++++-
>  3 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1043a-rdb.dts b/arch/arm64/boot/dts/freescale/fsl-ls1043a-rdb.dts
> index 4223a2352..c2ce1a611 100644
> --- a/arch/arm64/boot/dts/freescale/fsl-ls1043a-rdb.dts
> +++ b/arch/arm64/boot/dts/freescale/fsl-ls1043a-rdb.dts
> @@ -139,7 +139,7 @@
>  
>  	ethernet@...00 { /* 10GEC1 */
>  		phy-handle = <&aqr105_phy>;
> -		phy-connection-type = "xgmii";
> +		phy-connection-type = "usxgmii";
>  	};
>  
>  	mdio@...00 {
> diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1046a-rdb.dts b/arch/arm64/boot/dts/freescale/fsl-ls1046a-rdb.dts
> index 6a6514d0e..f927a8a25 100644
> --- a/arch/arm64/boot/dts/freescale/fsl-ls1046a-rdb.dts
> +++ b/arch/arm64/boot/dts/freescale/fsl-ls1046a-rdb.dts
> @@ -147,7 +147,7 @@
>  
>  	ethernet@...00 { /* 10GEC1 */
>  		phy-handle = <&aqr106_phy>;
> -		phy-connection-type = "xgmii";
> +		phy-connection-type = "usxgmii";
>  	};
>  
>  	ethernet@...00 { /* 10GEC2 */
> diff --git a/drivers/net/phy/aquantia_main.c b/drivers/net/phy/aquantia_main.c
> index 0fedd28fd..3f24c42a8 100644
> @@ -487,7 +491,7 @@ static int aqr107_config_init(struct phy_device *phydev)
>  	/* Check that the PHY interface type is compatible */
>  	if (phydev->interface != PHY_INTERFACE_MODE_SGMII &&
>  	    phydev->interface != PHY_INTERFACE_MODE_2500BASEX &&
> -	    phydev->interface != PHY_INTERFACE_MODE_XGMII &&
> +	    phydev->interface != PHY_INTERFACE_MODE_USXGMII &&
>  	    phydev->interface != PHY_INTERFACE_MODE_10GKR)
>  		return -ENODEV;

Hi Heiner

Just to reiterate Florian's point. We need to be careful with device
tree blobs. We should try not to break them, at least not for a few
cycles.

I would much prefer to see a

WARN_ON(phydev->interface == PHY_INTERFACE_MODE_XGMII,
        "Your devicetree is out of date, please update it");

and accept XGMII for this cycle. These are development boards, so in
theory users are developers, so should know how to update the DT.

    Andrew