netdev - Re: [PATCH v3] sh_eth: call of_mdiobus

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Message-ID: <530DDC32.9010002@cogentembedded.com>
Date:	Wed, 26 Feb 2014 16:21:06 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Ben Dooks <ben.dooks@...ethink.co.uk>, netdev@...r.kernel.org
CC:	linux-sh@...r.kernel.org, nobuhiro.iwamatsu.yj@...esas.com
Subject: Re: [PATCH v3] sh_eth: call of_mdiobus_register() to register phys

Hello.

On 26-02-2014 15:57, Ben Dooks wrote:

> If the sh_eth device is registered using OF, then the driver
> should call of_mdiobus_register() to register any PHYs connected
> to the system.

    I think you now should extend your changelog as you've decided to also use 
of_ohy_connect().

> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>

> --
> v2:
> 	- allocate mdio->irq array at init time
> 	- set devdata after succesful mdio registration
> v3:
> 	- do not parse phy->irq in of setup (done by of_mdiobus)
> 	- use of_phy_connect to connect phy
> ---
>   drivers/net/ethernet/renesas/sh_eth.c | 46 ++++++++++++++++++++++++++---------
>   1 file changed, 34 insertions(+), 12 deletions(-)

> diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
> index a18cbe1..6d14abf 100644
> --- a/drivers/net/ethernet/renesas/sh_eth.c
> +++ b/drivers/net/ethernet/renesas/sh_eth.c
[...]
> @@ -1764,17 +1765,31 @@ static int sh_eth_phy_init(struct net_device *ndev)
>   	struct sh_eth_private *mdp = netdev_priv(ndev);
>   	char phy_id[MII_BUS_ID_SIZE + 3];

    Shouldn't this variable be moved to where it's used now?

>   	struct phy_device *phydev = NULL;
> -
> -	snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT,
> -		 mdp->mii_bus->id, mdp->phy_id);
> +	struct device_node *np = ndev->dev.parent->of_node;
>
>   	mdp->link = 0;
>   	mdp->speed = 0;
>   	mdp->duplex = -1;
>
> -	/* Try connect to PHY */

     Why remove the comment?

> -	phydev = phy_connect(ndev, phy_id, sh_eth_adjust_link,
> -			     mdp->phy_interface);
> +	if (np) {
> +		struct device_node *pn;
> +
> +		pn = of_parse_phandle(np, "phy-handle", 0);
> +		phydev = of_phy_connect(ndev, pn,
> +					sh_eth_adjust_link, 0,
> +					mdp->phy_interface);
> +

    Empty line hardly needed here.

> +		if (!phydev)
> +			phydev = ERR_PTR(ENOENT);

    Not -ENOENT?

> +	} else {
> +		snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT,
> +			 mdp->mii_bus->id, mdp->phy_id);
> +
> +		/* Try connect to PHY */
> +		phydev = phy_connect(ndev, phy_id, sh_eth_adjust_link,
> +				     mdp->phy_interface);
> +	}
> +

    Empty line can be omitted here as well...

>   	if (IS_ERR(phydev)) {
>   		dev_err(&ndev->dev, "phy_connect failed\n");

    The message needs some adjustment now, like "can't connect to PHY\n".

> @@ -2638,6 +2653,18 @@ static int sh_mdio_init(struct net_device *ndev, int id,
>   		goto out_free_bus;
>   	}
>
> +	if (ndev->dev.parent->of_node) {
> +		ret = of_mdiobus_register(mdp->mii_bus,
> +					  ndev->dev.parent->of_node);
> +		if (ret != 0) {

    You forgot to remove != 0...

> +			dev_err(&ndev->dev, "of_mdiobus_register() failed\n");
> +			goto out_free_bus;
> +		}
> +
> +		dev_set_drvdata(&ndev->dev, mdp->mii_bus);
> +		return 0;

    Still repetitive without *goto* (or *else*)...

> +	}
> +
>   	for (i = 0; i < PHY_MAX_ADDR; i++)
>   		mdp->mii_bus->irq[i] = PHY_POLL;
>   	if (pd->phy_irq > 0)
[...]
> @@ -2727,11 +2753,7 @@ static struct sh_eth_plat_data *sh_eth_parse_dt(struct device *dev)
>   		return NULL;
>
>   	pdata->phy_interface = of_get_phy_mode(np);
> -
> -	phy = of_parse_phandle(np, "phy-handle", 0);
> -	if (of_property_read_u32(phy, "reg", &pdata->phy))
> -		return NULL;
> -	pdata->phy_irq = irq_of_parse_and_map(phy, 0);
> +	pdata->phy_irq = PHY_POLL;

    You can completely omit this. It won't get used now anyway.

WBR, Sergei

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