netdev - Re: [RESEND] [PATCH v4] sh_eth: update OF PHY registeration

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Date:	Thu, 27 Feb 2014 12:46:07 +0000
From:	Ben Dooks <ben.dooks@...ethink.co.uk>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
CC:	netdev@...r.kernel.org, linux-sh@...r.kernel.org,
	nobuhiro.iwamatsu.yj@...esas.com, magnus.damn@...nsource.se,
	horms@...ge.net.au
Subject: Re: [RESEND] [PATCH v4] sh_eth: update OF PHY registeration

On 26/02/14 19:47, Sergei Shtylyov wrote:
> On 02/26/2014 09:23 PM, 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 and of_phy_connect() to connect it.
>
>     s/it/to PHY/?


Ok, will change.

>> This ensures that any PHYs registered in the device tree are
>> appropriately connected to the parent devices nodes so that
>> the PHY drivers can access their OF properties.
>
>> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
>
> [...]
>
>> diff --git a/drivers/net/ethernet/renesas/sh_eth.c
>> b/drivers/net/ethernet/renesas/sh_eth.c
>> index a18cbe1..e597698 100644
>> --- a/drivers/net/ethernet/renesas/sh_eth.c
>> +++ b/drivers/net/ethernet/renesas/sh_eth.c
> [...]
>> @@ -1761,20 +1762,36 @@ static void sh_eth_adjust_link(struct
>> net_device *ndev)
>>   /* PHY init function */
>>   static int sh_eth_phy_init(struct net_device *ndev)
>>   {
>> +    struct device_node *np = ndev->dev.parent->of_node;
>>       struct sh_eth_private *mdp = netdev_priv(ndev);
>> -    char phy_id[MII_BUS_ID_SIZE + 3];
>>       struct phy_device *phydev = NULL;
>>
>> -    snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT,
>> -         mdp->mii_bus->id, mdp->phy_id);
>> -
>>       mdp->link = 0;
>>       mdp->speed = 0;
>>       mdp->duplex = -1;
>>
>>       /* Try connect to PHY */
>> -    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,
>
>     Hm, that 0 corresponds to 'flags' parameter which is not used. I
> wonder if that was intentional...

This can be left to a separate patch to fix.

>
>> +                    mdp->phy_interface);
>> +
>> +        if (!phydev)
>> +            phydev = ERR_PTR(-ENOENT);
>> +    } else {
>> +        char phy_id[MII_BUS_ID_SIZE + 3];
>> +
>> +        snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT,
>> +             mdp->mii_bus->id, mdp->phy_id);
>> +
>> +        /* Try connect to PHY */
>
>     Now this comment is kinda duplicate... :-)

Bah, got rid of it.

>> +        phydev = phy_connect(ndev, phy_id, sh_eth_adjust_link,
>> +                     mdp->phy_interface);
>> +    }
>> +
>>       if (IS_ERR(phydev)) {
>>           dev_err(&ndev->dev, "phy_connect failed\n");
>
>     I have asked to adjust the message a bit as we now have 2 alternate
> calls that can fail...

ok, changed to "failed to connect phy"

>
>>           return PTR_ERR(phydev);
>> @@ -2638,15 +2655,23 @@ static int sh_mdio_init(struct net_device
>> *ndev, int id,
>>           goto out_free_bus;
>>       }
>>
>> -    for (i = 0; i < PHY_MAX_ADDR; i++)
>> -        mdp->mii_bus->irq[i] = PHY_POLL;
>> -    if (pd->phy_irq > 0)
>> -        mdp->mii_bus->irq[pd->phy] = pd->phy_irq;
>> +    if (ndev->dev.parent->of_node) {
>> +        ret = of_mdiobus_register(mdp->mii_bus,
>> +                      ndev->dev.parent->of_node);
>> +    } else {
>> +        for (i = 0; i < PHY_MAX_ADDR; i++)
>> +            mdp->mii_bus->irq[i] = PHY_POLL;
>> +        if (pd->phy_irq > 0)
>> +            mdp->mii_bus->irq[pd->phy] = pd->phy_irq;
>>
>> -    /* register mdio bus */
>> -    ret = mdiobus_register(mdp->mii_bus);
>> -    if (ret)
>> +        /* register mdio bus */
>> +        ret = mdiobus_register(mdp->mii_bus);
>> +    }
>
>     That looks much better, thanks.
>
>> +
>
>     Although I'd have avoided the empty line...
>
>> +    if (ret) {
>> +        dev_err(&ndev->dev, "failed to register mdio\n");
>
>     That function generally avoids error messages, no? Although all
> errors are -ENOMEM type and that's supposed to cause kernel to loudly
> curse anyway... Well, let it be if you want.

mdiobus_register() or of_mdiobus_register() could return any error,
but i've moved the error print to the caller as this is useful to
know.

Thanks for the reviews, hopefully the next round will work.


-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius
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