netdev - Re: [PATCH net-next 6/9] dsa: mv88e6xxx: Set the RGMII delay based on phy interface

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Date:	Mon, 24 Aug 2015 10:01:38 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Andrew Lunn <andrew@...n.ch>
CC:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 6/9] dsa: mv88e6xxx: Set the RGMII delay based
 on phy interface

On 23/08/15 14:10, Andrew Lunn wrote:
> On Sun, Aug 23, 2015 at 11:44:01AM -0700, Florian Fainelli wrote:
>> Le 08/23/15 02:46, Andrew Lunn a écrit :
>>> Some Marvell switches allow the RGMII Rx and Tx clock to be delayed
>>> when the port is using RGMII. Have the adjust_link function look at
>>> the phy interface type and enable this delay as requested.
>>>
>>> Signed-off-by: Andrew Lunn <andrew@...n.ch>
>>> ---
>>>  drivers/net/dsa/mv88e6xxx.c | 10 ++++++++++
>>>  drivers/net/dsa/mv88e6xxx.h |  2 ++
>>>  2 files changed, 12 insertions(+)
>>>
>>> diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
>>> index 7901db6503b4..f5af368751b2 100644
>>> --- a/drivers/net/dsa/mv88e6xxx.c
>>> +++ b/drivers/net/dsa/mv88e6xxx.c
>>> @@ -612,6 +612,16 @@ void mv88e6xxx_adjust_link(struct dsa_switch *ds, int port,
>>>  	if (phydev->duplex == DUPLEX_FULL)
>>>  		reg |= PORT_PCS_CTRL_DUPLEX_FULL;
>>>  
>>> +	if ((mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds)) &&
>>> +	    (port >= ps->num_ports - 2)) {
>>
>> Are we positive that the last two ports of a switch are going to be
>> RGMII capable or is this something that should be moved to Device Tree /
>> platform data to account for different switch families? Maybe having a
>> bitmask of RGMII capable ports stored in "ps" would be good enough?
> 
> Hi Florian
> 
> For these two families, this is correct. And it is a property of the
> switch, not the board, so should not be in DT. Other families are
> different. Older ones are Fast Ethernet only. Some don't have any
> RGMII ports, etc. It could be with time, this condition gets messy, at
> which point, a bitmask in ps would make sense. But is it justified
> now?

Sure, I think for now this patch is good as-is, I was mostly curious
whether the assumption about the last 2 ports of the switch being RGMII
would hold for a while, and it looks like it will. With that:

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian
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