netdev - Re: [PATCH net-next v2 10/10] net: mdio: support C45-over-C22 when probed via OF

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Message-ID: <e5e1af31a4e609c94ac306f4f5140193@kernel.org>
Date: Mon, 26 Jun 2023 09:37:47 +0200
From: Michael Walle <mwalle@...nel.org>
To: Simon Horman <simon.horman@...igine.com>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
 Russell King <linux@...linux.org.uk>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
 <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Yisen Zhuang
 <yisen.zhuang@...wei.com>, Salil Mehta <salil.mehta@...wei.com>, Florian
 Fainelli <florian.fainelli@...adcom.com>, Broadcom internal kernel review
 list <bcm-kernel-feedback-list@...adcom.com>, Marek Behún <kabel@...nel.org>, Xu Liang <lxu@...linear.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 10/10] net: mdio: support C45-over-C22 when
 probed via OF

Hi Simon,

Am 2023-06-23 22:48, schrieb Simon Horman:
> On Fri, Jun 23, 2023 at 12:29:19PM +0200, Michael Walle wrote:
> 
> ...
> 
>> @@ -178,24 +209,26 @@ int __of_mdiobus_register(struct mii_bus *mdio, 
>> struct device_node *np,
>>  	if (rc)
>>  		return rc;
>> 
>> -	/* Loop over the child nodes and register a phy_device for each phy 
>> */
>> +	/* Loop over the child nodes, skipping C45 PHYs so we can scan for
>> +	 * broken C22 PHYs. The C45 PHYs will be registered afterwards.
>> +	 */
>>  	for_each_available_child_of_node(np, child) {
>> -		addr = of_mdio_parse_addr(&mdio->dev, child);
>> -		if (addr < 0) {
>> -			scanphys = true;
>> +		if (of_mdiobus_child_is_c45_phy(child))
>>  			continue;
>> -		}
>> +		rc = of_mdiobus_register_child(mdio, child, &scanphys);
>> +		if (rc)
>> +			goto unregister;
>> +	}
>> 
>> -		if (of_mdiobus_child_is_phy(child))
>> -			rc = of_mdiobus_register_phy(mdio, child, addr);
>> -		else
>> -			rc = of_mdiobus_register_device(mdio, child, addr);
>> +	/* Some C22 PHYs are broken with C45 transactions. */
>> +	mdiobus_scan_for_broken_c45_access(mdio);
> 
> Hi Michael,
> 
> Unfortunately this seems to cause a build fauilure
> for x86_64 allmodconfig.
> 
> ERROR: modpost: "mdiobus_scan_for_broken_c45_access" 
> [drivers/net/mdio/of_mdio.ko] undefined!

Oops, sorry. Seems I've forgot to export it. I guess it should
be EXPORT_SYMBOL_GPL().

-michael