linux-kernel - Re: [PATCH v3 3/4] net: stmmac: register parent MDIO node for sun8i-h3-emac

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Message-ID: <CAGb2v66KcZkiDDHryMmVzm4WroXePPy3V44SLpVdoO3ZEjgC=g@mail.gmail.com>
Date:   Sat, 19 Aug 2017 01:05:21 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Corentin Labbe <clabbe.montjoie@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 3/4] net: stmmac: register parent MDIO node for sun8i-h3-emac

On Fri, Aug 18, 2017 at 8:21 PM, Corentin Labbe
<clabbe.montjoie@...il.com> wrote:
> In case of a MDIO switch, the registered MDIO node should be
> the parent of the PHY. Otherwise of_phy_connect will fail.
>
> Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index a366b3747eeb..ca3cc99d8960 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -312,10 +312,12 @@ static int stmmac_dt_phy(struct plat_stmmacenet_data *plat,
>         static const struct of_device_id need_mdio_ids[] = {
>                 { .compatible = "snps,dwc-qos-ethernet-4.10" },
>                 { .compatible = "allwinner,sun8i-a83t-emac" },
> -               { .compatible = "allwinner,sun8i-h3-emac" },
>                 { .compatible = "allwinner,sun8i-v3s-emac" },
>                 { .compatible = "allwinner,sun50i-a64-emac" },
>         };
> +       static const struct of_device_id need_mdio_mux_ids[] = {
> +               { .compatible = "allwinner,sun8i-h3-emac" },
> +       };
>
>         /* If phy-handle property is passed from DT, use it as the PHY */
>         plat->phy_node = of_parse_phandle(np, "phy-handle", 0);
> @@ -332,7 +334,13 @@ static int stmmac_dt_phy(struct plat_stmmacenet_data *plat,
>                 mdio = false;
>         }
>
> -       if (of_match_node(need_mdio_ids, np)) {
> +       /*
> +        * In case of a MDIO switch/mux, the registered MDIO node should be
> +        * the parent of the PHY. Otherwise of_phy_connect will fail.
> +        */
> +       if (of_match_node(need_mdio_mux_ids, np)) {
> +                plat->mdio_node =  of_get_parent(plat->phy_node);

Extra space before of_get_parent.

Also this is going to fail horribly if a fixed link is used.

ChenYu

> +       } else if (of_match_node(need_mdio_ids, np)) {
>                 plat->mdio_node = of_get_child_by_name(np, "mdio");
>         } else {
>                 /**
> --
> 2.13.0
>