Re: [PATCH 4/6] of: add API for changing parameters of fixed link

27.03.2015 20:15, Florian Fainelli пишет:

On 27/03/15 09:39, Stas Sergeev wrote:

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27.03.2015 19:21, Florian Fainelli пишет:

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Do you want mvneta to register a similar callback in of_mdio, instead
of adding an explicit state-updating functions? Something like
of_phy_fixed_link_set_update_callback()?

You don't need an of_phy_fixed_link_set_update callback, you just need
to provide a fixed_link_update callback in mvneta, that you register,

That approach I in fact considered initially, as the simplest one,
and even had a patch. But I disliked the fact that then mvneta will
exploit the knowledge of the fact that of_phy_register_fixed_link()
uses a fixed_phy driver. What if the implementation will later change?

There is no reason why it should change later, that's the entire purpose
of why we can tell whether it is a fixed PHY or a regular MDIO-managed
PHY, and drivers rely on that for their operations.

I don't think anything is exported to the outside of of_mdio.
It uses fixed_phy driver completely internally. Assuming that we
can pass the created phy_device to the fixed_phy API directly, look
like a bit of layering violation to me. But it is not that big as to
worry about. :)
I don't think many drivers rely on that - perhaps only dsa_slave.
So I'll add the second one.

Ok, you could either make of_phy_register_fixed_link() return a
phy_device,

OK, if you think that's right - I'll do.
I was under an impression that this was intentional to not return
the phy.

I think your concerns are valid, but I don't think there is going to be
any problem with the approach I suggested because there is a contract
that the fixed PHYs and regular PHYs need to

OK, so I'll do that on Monday then.