On Tue, Nov 23, 2021 at 09:33:03AM +0800, zhuyinbo wrote:

在 2021/11/22 下午10:07, Andrew Lunn 写道:

    On Mon, Nov 22, 2021 at 08:14:57PM +0800, Yinbo Zhu wrote:

        After module compilation, module alias mechanism will generate a ugly
        mdio modules alias configure if ethernet phy was selected, this patch
        is to fixup mdio alias garbled code.

        In addition, that ugly alias configure will cause ethernet phy module
        doens't match udev, phy module auto-load is fail, but add this patch
        that it is well mdio driver alias configure match phy device uevent.

    What PHY do you have problems with? What is the PHY id and which
    driver should be loaded.

    This code has existed a long time, so suddenly saying it is wrong and
    changing it needs a good explanation why it is wrong. Being ugly is
    not a good reason.

        Andrew

Hi Andrew,

    Use default mdio configure, After module compilation, mdio alias configure
is following and it doesn't match

    the match phy dev(mdio dev)  uevent, because the mdio alias configure 
"0000000101000001000011111001????"  include "?" and

A PHY ID generally break up into 3 parts.

The OUI of the manufacture.
The device.
The revision

The ? means these bits don't matter. Those correspond to the
revision. Generally, a driver can driver any revision of the PHY,
which is why those bits don't matter.

So when a driver probes with the id 00000001010000010000111110010110
we expect user space to find the best match, performing wildcard
expansion. So the ? will match anything.

Since this is worked for a long time, do you have an example where it
is broken? If so, which PHY driver? If it is broken, no driver is
loaded, or the wrong driver is loaded, i expect it is a bug in a
specific driver. And we should fix that bug in the specific driver.

     Andrew