linux-kernel - Re: [PATCH RFC] net: of_mdio: Scan PHYs which have device

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Message-Id: <20131211091544.EA4F7C4061A@trevor.secretlab.ca>
Date:	Wed, 11 Dec 2013 09:15:44 +0000
From:	Grant Likely <grant.likely@...aro.org>
To:	Florian Fainelli <f.fainelli@...il.com>,
	Srinivas Kandagatla <srinivas.kandagatla@...com>
Cc:	devicetree@...r.kernel.org, Rob Herring <rob.herring@...xeda.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH RFC] net: of_mdio: Scan PHYs which have device_type set to ethernet-phy

On Wed, 11 Dec 2013 07:15:54 +0000, Florian Fainelli <f.fainelli@...il.com> wrote:
> Le jeudi 14 novembre 2013, 15:05:56 Srinivas Kandagatla a écrit :
> > According to Documentation/devicetree/bindings/net/phy.txt device_type
> > property of PHY nodes is mandatory, which should be set to
> > "ethernet-phy". This patch adds check in scanning phys and only scans
> > node which have device-type set to "ethernet-phy".
> 
> Please CC netdev@...r.kernel.org as there might be networking folks not 
> actively following devicetree-discuss.
> 
> > 
> > Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...com>
> > ---
> >  drivers/of/of_mdio.c |    7 +++++++
> >  1 files changed, 7 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
> > index d5a57a9..78c53c7 100644
> > --- a/drivers/of/of_mdio.c
> > +++ b/drivers/of/of_mdio.c
> > @@ -57,6 +57,9 @@ int of_mdiobus_register(struct mii_bus *mdio, struct
> > device_node *np)
> > 
> >  	/* Loop over the child nodes and register a phy_device for each one */
> >  	for_each_available_child_of_node(np, child) {
> > +		/* A PHY must have device_type set to "ethernet-phy" */
> > +		if (of_node_cmp(child->type, "ethernet-phy"))
> > +			continue;
> 
> As already stated by Grant this will break quite a lot of platforms out there. 
> Technically speaking, ePAPR v1.1 only specifies that "cpu" and "memory" nodes 
> should have a "device_type" property for compatibility. Altough I do agree 
> that it is nice to have a properly set "device_type", we can't always rely on 
> that. 

Actually it is the opposite. device_type is deprecated and has been for
a long time now. Device bindings should not not be using device_type
unless it is there for legacy compatibility.

g.

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