netdev - Re: [PATCH v4 1/4] net: axienet: setup mdio unconditionally

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Date:   Mon, 21 Mar 2022 18:08:57 +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 1/4] net: axienet: setup mdio unconditionally

On Mon, 2022-03-21 at 23:25 +0800, Andy Chiu wrote:
> The call to axienet_mdio_setup should not depend on whether "phy-node"
> pressents on the DT. Besides, since `lp->phy_node` is used if PHY is in
> SGMII or 100Base-X modes, move it into the if statement. And the next patch
> will remove `lp->phy_node` from driver's private structure and do an
> of_node_put on it right away after use since it is not used elsewhere.
> 
> 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 | 13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> index 6fd5157f0a6d..5d41b8de840a 100644
> --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> @@ -2064,15 +2064,14 @@ static int axienet_probe(struct platform_device
> *pdev)
>  	if (ret)
>  		goto cleanup_clk;
>  
> -	lp->phy_node = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
> -	if (lp->phy_node) {
> -		ret = axienet_mdio_setup(lp);
> -		if (ret)
> -			dev_warn(&pdev->dev,
> -				 "error registering MDIO bus: %d\n", ret);
> -	}
> +	ret = axienet_mdio_setup(lp);
> +	if (ret)
> +		dev_warn(&pdev->dev,
> +			 "error registering MDIO bus: %d\n", ret);
> +
>  	if (lp->phy_mode == PHY_INTERFACE_MODE_SGMII ||
>  	    lp->phy_mode == PHY_INTERFACE_MODE_1000BASEX) {
> +		lp->phy_node = of_parse_phandle(pdev->dev.of_node, "phy-
> handle", 0);
>  		if (!lp->phy_node) {
>  			dev_err(&pdev->dev, "phy-handle required for
> 1000BaseX/SGMII\n");
>  			ret = -EINVAL;

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

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