linux-kernel - Re: [PATCH net 1/2] net: phy: Use C45 Helpers in phy_read

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Message-ID: <6dc7b38f-c27a-e9f7-da32-3f58dae2e707@gmail.com>
Date:   Sat, 2 Mar 2019 15:52:52 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jose Abreu <jose.abreu@...opsys.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Joao Pinto <joao.pinto@...opsys.com>
Subject: Re: [PATCH net 1/2] net: phy: Use C45 Helpers in phy_read_status()

On 02.03.2019 15:11, Andrew Lunn wrote:
> On Fri, Mar 01, 2019 at 07:14:20PM -0800, Florian Fainelli wrote:
>>
>>
>> On 3/1/2019 2:54 AM, Jose Abreu wrote:
>>> Currently phy_read_status() considers that either the PHY driver has the
>>> read_status() callback or uses the generic callback.
>>>
>>> For C45 PHYs we need to use the gen10g_read_status() callback.
>>
The gen10g_ functions are deprecated and shouldn't be used in new code.
Consider the (partially brand-new) genphy_c45_ functions instead.
This should be ok because I think the two changes are material for
net-next.

The gen10g functions belong to the old gen10g driver which knows about
10G only. I think sooner or later we'll replace it with a genc45
driver or similar.

>> Right, so we could expect your C45 PHY driver to assign the read_status
>> callback to gen10g_read_status() if it is appropriate. So far most of
>> the 10g PHY drivers (cortina, marvell10g, aquantia) have to define their
>> own read_status() callback to be feature complete. Unlike C22 PHYs that
>> can really be driven with a simple generic PHY driver model for standard
>> features, C45 PHYs seem to be quirky enough this does not work anymore.
> 
> Hi Jose
> 
> Does your PHY support 1000Base-T? If so you need read_status() because
> the registers for that link mode don't appear to be standardized.
> 
>     Andrew
> 
Heiner