linux-kernel - Re: [PATCH RFC net-next 2/5] net: phy: support indirect c45 access in get_phy_c45

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Message-ID: <7503a496e1456fa65e4317bbe7590d9d@walle.cc>
Date:   Thu, 24 Mar 2022 15:28:43 +0100
From:   Michael Walle <michael@...le.cc>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "David S . Miller" <davem@...emloft.net>,
        Xu Liang <lxu@...linear.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC net-next 2/5] net: phy: support indirect c45 access in
 get_phy_c45_ids()

Am 2022-03-23 20:39, schrieb Andrew Lunn:
>> +static int mdiobus_probe_mmd_read(struct mii_bus *bus, int prtad, int 
>> devad,
>> +				  u16 regnum)
>> +{
>> +	int ret;
>> +
>> +	/* For backwards compatibility, treat MDIOBUS_NO_CAP as c45 capable 
>> */
>> +	if (bus->probe_capabilities == MDIOBUS_NO_CAP ||
>> +	    bus->probe_capabilities >= MDIOBUS_C45)
> 
> Maybe we should do the work and mark up those that are C45 capable. At
> a quick count, see 16 of them.

I guess you grepped for MII_ADDR_C45 and had a look who
actually handled it correctly. Correct?

Let's say we mark these as either MDIOBUS_C45 or MDIOBUS_C45_C22,
can we then drop MDIOBUS_NO_CAP and make MDIOBUS_C22 the default
value (i.e. value 0) or do we have to go through all the mdio drivers
and add bus->probe_capabilities = MDIOBUS_C22 ? Grepping for
{of_,}mdiobus_register lists quite a few of them.

-michael