netdev - Re: [PATCH] sh_eth: call of_mdiobus

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Date:	Mon, 17 Feb 2014 15:46:44 +0000
From:	Ben Dooks <ben.dooks@...ethink.co.uk>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
CC:	netdev@...r.kernel.org, horms+renesas@...ge.net.au,
	linux-sh@...r.kernel.org, magnus@...nsource.se,
	linux-kernel@...ts.codethink.co.uk
Subject: Re: [PATCH] sh_eth: call of_mdiobus_register() to register phys

On 17/02/14 16:40, Sergei Shtylyov wrote:
> Hello.
>
> On 02/17/2014 06:28 PM, Ben Dooks wrote:
>
>> If the sh_eth device is registered using OF, then the driver
>
>     Which is not supported yet as my DT patch hasn't been merged.
> This patch seems somewhat premature.

I've got your OF patches in my local tree to test with, this
is what I found during that testing.

>> should call of_mdiobus_register() to register any PHYs connected
>> to the system.
>
>     That's not necessary (but good to have).

Well, it is necessary if you then want any PHYS bound to
the device to have their OF information to hand,

>> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
>> ---
>>   drivers/net/ethernet/renesas/sh_eth.c | 13 +++++++++++++
>>   1 file changed, 13 insertions(+)
>
>> diff --git a/drivers/net/ethernet/renesas/sh_eth.c
>> b/drivers/net/ethernet/renesas/sh_eth.c
>> index 06970ac..165f0c4 100644
>> --- a/drivers/net/ethernet/renesas/sh_eth.c
>> +++ b/drivers/net/ethernet/renesas/sh_eth.c
> [...]
>> @@ -2629,6 +2630,18 @@ static int sh_mdio_init(struct net_device
>> *ndev, int id,
>>       snprintf(mdp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
>>            mdp->pdev->name, id);
>>
>> +    if (ndev->dev.parent->of_node) {
>> +        dev_set_drvdata(&ndev->dev, mdp->mii_bus);
>> +        ret = of_mdiobus_register(mdp->mii_bus,
>> +                      ndev->dev.parent->of_node);
>> +        if (ret != 0) {
>> +            dev_err(&ndev->dev, "of_mdiobus_register() failed\n");
>> +            goto out_free_bus;
>> +        }

I should probably only set the drvdata if the
of_mdiobus_register() succeeds.

>> +        return 0;
>> +    }
>> +
>>       /* PHY IRQ */
>>       mdp->mii_bus->irq = devm_kzalloc(&ndev->dev,
>>                        sizeof(int) * PHY_MAX_ADDR,
>>
>
>      Hm, I can only hope this works with PHY IRQ in DT mode.
> Would you mind if I include your patch into my Ether DT patch?

You are welcome to include it in your series, but I would like
to keep the credit for finding this.

Also, FYI, for some reason the probe is not finding the correct
IRQ for this. I will have a look later when I get the board back
as to why this is:

net eth0: attached PHY 1 (IRQ -1) to driver Micrel KSZ8041RNLI

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