linux-kernel - Re: [PATCH] net/phy/vitesse: Configure RGMII skew on VSC8601, if needed

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Message-Id: <20161115.221217.2076182289174952941.davem@davemloft.net>
Date:   Tue, 15 Nov 2016 22:12:17 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     alex.g@...ptrum.com
Cc:     f.fainelli@...il.com, gokhan@...ptrum.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/phy/vitesse: Configure RGMII skew on VSC8601, if
 needed

From: Alex <alex.g@...ptrum.com>
Date: Mon, 14 Nov 2016 13:54:57 -0800

> 
> 
> On 11/14/2016 01:25 PM, Florian Fainelli wrote:
>> On 11/14/2016 01:18 PM, David Miller wrote:
>>> From: Alexandru Gagniuc <alex.g@...ptrum.com>
>>> Date: Sat, 12 Nov 2016 15:32:13 -0800
>>>
>>>> +	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
>>>> +		ret = vsc8601_add_skew(phydev);
>>>
>>> I think you should use phy_interface_is_rgmii() here.
>>>
>>
>> This would include all RGMII modes, here I think the intent is to
>> check
>> for PHY_INTERFACE_MODE_RGMII_ID and PHY_INTERFACE_MODE_RGMII_TXID (or
>> RXID),
> 
> That is correct.
> 
>>  Alexandru, what direction does the skew settings apply to?
> 
> It applies a skew in both TX and RX directions.

Please repost your patch, making the intent clear either in the
commit message or a code comment.

Thanks.