netdev - Re: [PATCH v4 4/4] net: axiemac: use a phandle to reference pcs

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Date:   Mon, 21 Mar 2022 18:12:18 +0000
From:   Robert Hancock <robert.hancock@...ian.com>
To:     "michal.simek@...inx.com" <michal.simek@...inx.com>,
        "andy.chiu@...ive.com" <andy.chiu@...ive.com>,
        "radhey.shyam.pandey@...inx.com" <radhey.shyam.pandey@...inx.com>
CC:     "andrew@...n.ch" <andrew@...n.ch>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "greentime.hu@...ive.com" <greentime.hu@...ive.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>
Subject: Re: [PATCH v4 4/4] net: axiemac: use a phandle to reference pcs_phy

On Mon, 2022-03-21 at 23:25 +0800, Andy Chiu wrote:
> In some SGMII use cases where both a fixed link external PHY and the
> internal PCS/PMA PHY need to be configured, we should explicitly use a
> phandle "pcs-phy" to get the reference to the PCS/PMA PHY. Otherwise, the
> driver would use "phy-handle" in the DT as the reference to both the
> external and the internal PCS/PMA PHY.
> 
> In other cases where the core is connected to a SFP cage, we could still
> point phy-handle to the intenal PCS/PMA PHY, and let the driver connect
> to the SFP module, if exist, via phylink.
> 
> Fixes: 1a02556086fc (net: axienet: Properly handle PCS/PMA PHY for 1000BaseX
> mode)
> Signed-off-by: Andy Chiu <andy.chiu@...ive.com>
> Reviewed-by: Greentime Hu <greentime.hu@...ive.com>
> ---
>  drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> index 496a9227e760..163753508464 100644
> --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> @@ -2071,9 +2071,16 @@ static int axienet_probe(struct platform_device *pdev)
>  
>  	if (lp->phy_mode == PHY_INTERFACE_MODE_SGMII ||
>  	    lp->phy_mode == PHY_INTERFACE_MODE_1000BASEX) {
> -		np = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
> +		np = of_parse_phandle(pdev->dev.of_node, "pcs-handle", 0);
>  		if (!np) {
> -			dev_err(&pdev->dev, "phy-handle required for
> 1000BaseX/SGMII\n");
> +			/* Deprecated: Always use "pcs-handle" for pcs_phy.
> +			 * Falling back to "phy-handle" here is only for
> +			 * backward compatibility with old device trees.
> +			 */
> +			np = of_parse_phandle(pdev->dev.of_node, "phy-handle",
> 0);
> +		}
> +		if (!np) {
> +			dev_err(&pdev->dev, "pcs-handle (preferred) or phy-
> handle required for 1000BaseX/SGMII\n");
>  			ret = -EINVAL;
>  			goto cleanup_mdio;
>  		}

Reviewed-by: Robert Hancock <robert.hancock@...ian.com>

-- 
Robert Hancock
Senior Hardware Designer, Calian Advanced Technologies
www.calian.com