linux-kernel - Re: linux-next: Tree for May 18 (drivers/net/dsa/qca8k.c)

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Date:   Tue, 18 May 2021 20:02:23 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        John Crispin <john@...ozen.org>,
        Ansuel Smith <ansuelsmth@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: linux-next: Tree for May 18 (drivers/net/dsa/qca8k.c)

On Tue, May 18, 2021 at 09:57:13AM -0700, Randy Dunlap wrote:
> On 5/18/21 9:43 AM, Vladimir Oltean wrote:
> > Hi Randy,
> > 
> > Would something like this work?
> > 
> > -----------------------------[ cut here ]-----------------------------
> > From 36c0b3f04ebfa51e52bd1bc2dc447d12d1c6e119 Mon Sep 17 00:00:00 2001
> > From: Vladimir Oltean <olteanv@...il.com>
> > Date: Tue, 18 May 2021 19:39:18 +0300
> > Subject: [PATCH] net: mdio: provide shim implementation of
> >  devm_of_mdiobus_register
> > 
> > Similar to the way in which of_mdiobus_register() has a fallback to the
> > non-DT based mdiobus_register() when CONFIG_OF is not set, we can create
> > a shim for the device-managed devm_of_mdiobus_register() which calls
> > devm_mdiobus_register() and discards the struct device_node *.
> > 
> > In particular, this solves a build issue with the qca8k DSA driver which
> > uses devm_of_mdiobus_register and can be compiled without CONFIG_OF.
> > 
> > Reported-by: Randy Dunlap <rdunlap@...radead.org>
> > Signed-off-by: Vladimir Oltean <olteanv@...il.com>
> > ---
> >  include/linux/of_mdio.h | 7 +++++++
> >  1 file changed, 7 insertions(+)
> > 
> > diff --git a/include/linux/of_mdio.h b/include/linux/of_mdio.h
> > index 2b05e7f7c238..da633d34ab86 100644
> > --- a/include/linux/of_mdio.h
> > +++ b/include/linux/of_mdio.h
> > @@ -72,6 +72,13 @@ static inline int of_mdiobus_register(struct mii_bus *mdio, struct device_node *
> >  	return mdiobus_register(mdio);
> >  }
> >  
> > +static inline int devm_of_mdiobus_register(struct device *dev,
> > +					   struct mii_bus *mdio,
> > +					   struct device_node *np)
> > +{
> > +	return devm_mdiobus_register(dev, mdio);
> > +}
> > +
> >  static inline struct mdio_device *of_mdio_find_device(struct device_node *np)
> >  {
> >  	return NULL;
> > -----------------------------[ cut here ]-----------------------------
> > 
> 
> Yes, that's all good. Thanks.
> 
> Acked-by: Randy Dunlap <rdunlap@...radead.org> # build-tested

Thanks. Waiting for a little bit longer for somebody a little more
authoritative on the MDIO/PHY topic, will submit formally afterwards.