linux-kernel - Re: SoCFPGA ethernet broken

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Message-ID: <20151016155644.GJ10146@lunn.ch>
Date:	Fri, 16 Oct 2015 17:56:44 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Dinh Nguyen <dinguyen@...nsource.altera.com>
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	David Daney <ddaney@...iumnetworks.com>,
	"David S. Miller" <davem@...emloft.net>, david.daney@...ium.com,
	netdev@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: SoCFPGA ethernet broken

> So I think I'll move to inspect what Florian had suggested, and that was to look
> at: drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c::stmmac_mdio_register 

I have a suspicion. If you look at the phy driver it does:

static int ksz9021_config_init(struct phy_device *phydev)
{
        const struct device *dev = &phydev->dev;
        const struct device_node *of_node = dev->of_node;

        if (!of_node && dev->parent->of_node)
                of_node = dev->parent->of_node;

In your case, you don't have a phy node in your device tree, so of_node
is NULL. So it looks in the parent device.

    phylib: Make PHYs children of their MDIO bus, not the bus' parent.

changed what the parent is. It is now the mdio device. Before, i
suspect it was the MAC. Hence it found your properties in the MAC
node.

What i think you might want to do is change this code. Rather than
look a dev->parent->of_node; you might want
phydev->attached_dev->dev->of_node.

This assumes the phy has been attached to the MAC. I've no idea of the
ordering, so maybe it has not been attached yet?

dp83867.c has similar code. However quick grep did not find any
mainline users with properties in the MAC node. If that is true, i
would suggest removing the code looking in the parent for that phy
driver.

	Andrew
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