netdev - Re: [PATCH] stmmac: Don't exit mdio registration when mdio subnode is not found in the DTS

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Date:	Sun, 3 Jan 2016 15:36:06 +0100
From:	Romain Perier <romain.perier@...il.com>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	peppe.cavallaro@...com, netdev <netdev@...r.kernel.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>
Subject: Re: [PATCH] stmmac: Don't exit mdio registration when mdio subnode is
 not found in the DTS

Hi,

2016-01-02 18:52 GMT+01:00 Florian Fainelli <f.fainelli@...il.com>:
>
>>> This looks reasonable, does it work if we just assign mdio_node to the pdev->dev.of_node to be backwards compatible with DTSes which have not yet been updated?
>>>
>>
>> I don't understand what you mean. Instead of defining mdio_node with
>> NULL, you propose to assign it to pdev->dev.of_node as its default
>> value... then it would be reassigned with "child_nod" if a subnode
>> with the compatible string "snps,dwmac-mdio" is found, or kept with
>> its default value otherwise... and in this case we could call
>> of_mdiobus_register(new_bus, mdio_node) all the time ? (it removes the
>> conditonnal branch)
>
> Your understanding is correct, this is what I was suggesting, thanks

So in this case, I already tested this yesterday, it does not work,
basically because the for loop just after of_mdiobus_register is never
executed, probably because new_bus->phy_map is not populated, which is
not the case by calling mdiobus_register for example.
of_mdiobus_register seems to populate this array of phys only for
subnodes found in the devicetree...

Regards,
Romain
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