linux-kernel - Re: [PATCH v3] net: ethernet: support "fixed-link" DT node on nb8800 driver

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Message-ID: <56B4BDDA.9010708@laposte.net>
Date:	Fri, 05 Feb 2016 16:20:58 +0100
From:	Sebastian Frias <sf84@...oste.net>
To:	Måns Rullgård <mans@...sr.com>
CC:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>, mason <slash.tmp@...e.fr>
Subject: Re: [PATCH v3] net: ethernet: support "fixed-link" DT node on nb8800
 driver

On 02/05/2016 04:08 PM, Måns Rullgård wrote:
> Sebastian Frias <sf84@...oste.net> writes:
>
>> On 02/05/2016 03:34 PM, Måns Rullgård wrote:
>>> Sebastian Frias <sf84@...oste.net> writes:
>>>
>>>> Signed-off-by: Sebastian Frias <sf84@...oste.net>
>>>
>>> Please change the subject to something like "net: ethernet: nb8800:
>>> support fixed-link DT node" and add a comment body.
>>
>> The subject is pretty explicit for such a simple patch, what else
>> could I add that wouldn't be unnecessary chat?
>
> It's customary to include a description body even if it's little more
> than a restatement of the subject.  Also, while the subject usually only
> says _what_ the patch does, the body should additionally state _why_ it
> is needed.

I understand, but _why_ it is needed is also obvious in this case; I 
mean, without the patch "fixed-link" cannot be used.
Other patches may not be as obvious/simple and thus justify and require 
more details.

Anyway, I added "Properly handles the case where the PHY is not connected
to the real MDIO bus" would that be ok?

>
>>>> ---
>>>>    drivers/net/ethernet/aurora/nb8800.c | 14 +++++++++++++-
>>>>    1 file changed, 13 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/net/ethernet/aurora/nb8800.c
>>>> b/drivers/net/ethernet/aurora/nb8800.c
>>>> index ecc4a33..e1fb071 100644
>>>> --- a/drivers/net/ethernet/aurora/nb8800.c
>>>> +++ b/drivers/net/ethernet/aurora/nb8800.c
>>>> @@ -1460,7 +1460,19 @@ static int nb8800_probe(struct platform_device *pdev)
>>>>    		goto err_disable_clk;
>>>>    	}
>>>>
>>>> -	priv->phy_node = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
>>>> +	if (of_phy_is_fixed_link(pdev->dev.of_node)) {
>>>> +		ret = of_phy_register_fixed_link(pdev->dev.of_node);
>>>> +		if (ret < 0) {
>>>> +			dev_err(&pdev->dev, "bad fixed-link spec\n");
>>>> +			goto err_free_bus;
>>>> +		}
>>>> +		priv->phy_node = of_node_get(pdev->dev.of_node);
>>>> +	}
>>>> +
>>>> +	if (!priv->phy_node)
>>>> +		priv->phy_node = of_parse_phandle(pdev->dev.of_node,
>>>> +						  "phy-handle", 0);
>>>> +
>>>>    	if (!priv->phy_node) {
>>>>    		dev_err(&pdev->dev, "no PHY specified\n");
>>>>    		ret = -ENODEV;
>>>> --
>>>> 2.1.4
>>>
>