netdev - Re: [PATCH] net: phy: Assign the c45 id to phy

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Message-ID: <b89d8987-574e-42cf-aaac-9c3524bc0610@lunn.ch>
Date: Mon, 12 Jun 2023 17:37:22 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Jianhui Zhao <zhaojh329@...il.com>
Cc: hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: phy: Assign the c45 id to phy_id property when
 matched.

On Mon, Jun 12, 2023 at 10:33:20PM +0800, Jianhui Zhao wrote:
> If a phydevice use c45, its phy_id property is always 0 previously.
> This change make the phy_id property has a valid value assigned from
> c45 id.

It is more than a valid value. It is the ID which was used to match
the device to a driver.

But as Russell pointed out, it is only valid if a match is made. And
if a match is made, you know what driver is loaded via the symlink in
sysfs. The more interesting use case is no match is performed and you
want to figure out why. And for that, you need all the IDs, since any
can be used to match to a driver.

So, back to a directory of all the IDs

I also asked that you update the sysfs documentation. I've asked this
twice now, and you have not done it. A patch will not be accepted
without the sysfs API documentation.

     Andrew