linux-kernel - Re: [PATCH 3/3] net: davinci_emac: match the mdio device against its compatible if possible

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Date:   Tue, 19 Jun 2018 09:56:05 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "David S . Miller" <davem@...emloft.net>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        Rob Herring <robh@...nel.org>, Lukas Wunner <lukas@...ner.de>,
        Kevin Hilman <khilman@...nel.org>,
        David Lechner <david@...hnology.com>,
        Sekhar Nori <nsekhar@...com>, Andrew Lunn <andrew@...n.ch>
Cc:     linux-omap@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 3/3] net: davinci_emac: match the mdio device against its
 compatible if possible

On 06/19/2018 09:09 AM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> Device tree based systems without of_dev_auxdata will have the mdio
> device named differently than "davinci_mdio(.0)". In this case use the
> device's compatible string for matching.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>  drivers/net/ethernet/ti/davinci_emac.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
> index a1a6445b5a7e..c28a35bb852f 100644
> --- a/drivers/net/ethernet/ti/davinci_emac.c
> +++ b/drivers/net/ethernet/ti/davinci_emac.c
> @@ -1387,6 +1387,10 @@ static int emac_devioctl(struct net_device *ndev, struct ifreq *ifrq, int cmd)
>  
>  static int match_first_device(struct device *dev, void *data)
>  {
> +	if (dev->of_node)
> +		return of_device_is_compatible(dev->of_node,
> +					       "ti,davinci_mdio");

Why would we be matching the PHY device with the MDIO controller
compatibe string? Why not check dev->parent.of_node instead which would
make more sense?
-- 
Florian