linux-kernel - Re: [net-next PATCH v5 07/15] net: mdiobus: Introduce fwnode_mdiobus_register

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Date:   Tue, 9 Feb 2021 20:34:33 +0530
From:   Calvin Johnson <calvin.johnson@....nxp.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Grant Likely <grant.likely@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Florin Laurentiu Chiculita <florinlaurentiu.chiculita@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Pieter Jansen Van Vuuren <pieter.jansenvv@...boosystems.io>,
        Jon <jon@...id-run.com>, Saravana Kannan <saravanak@...gle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Diana Madalina Craciun <diana.craciun@....com>,
        linux-acpi@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        linux.cj@...il.com, Jakub Kicinski <kuba@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Frank Rowand <frowand.list@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-arm-kernel@...ts.infradead.org,
        Laurentiu Tudor <laurentiu.tudor@....com>
Subject: Re: [net-next PATCH v5 07/15] net: mdiobus: Introduce
 fwnode_mdiobus_register_phy()

On Mon, Feb 08, 2021 at 05:40:13PM +0000, Russell King - ARM Linux admin wrote:
> On Mon, Feb 08, 2021 at 08:42:36PM +0530, Calvin Johnson wrote:
> > +int fwnode_mdiobus_register_phy(struct mii_bus *bus,
> > +				struct fwnode_handle *child, u32 addr)
> > +{
> > +	struct mii_timestamper *mii_ts;
> 
> If you initialise this to NULL...
> 
> > +	struct phy_device *phy;
> > +	bool is_c45 = false;
> > +	u32 phy_id;
> > +	int rc;
> > +
> > +	if (is_of_node(child)) {
> > +		mii_ts = of_find_mii_timestamper(to_of_node(child));
> > +		if (IS_ERR(mii_ts))
> > +			return PTR_ERR(mii_ts);
> > +	}
> > +
> > +	rc = fwnode_property_match_string(child, "compatible", "ethernet-phy-ieee802.3-c45");
> > +	if (rc >= 0)
> > +		is_c45 = true;
> > +
> > +	if (is_c45 || fwnode_get_phy_id(child, &phy_id))
> > +		phy = get_phy_device(bus, addr, is_c45);
> > +	else
> > +		phy = phy_device_create(bus, addr, phy_id, 0, NULL);
> > +	if (IS_ERR(phy)) {
> > +		if (mii_ts && is_of_node(child))
> 
> Then you don't need is_of_node() here.
> 
> > +		/* phy->mii_ts may already be defined by the PHY driver. A
> > +		 * mii_timestamper probed via the device tree will still have
> > +		 * precedence.
> > +		 */
> > +		if (mii_ts)
> > +			phy->mii_ts = mii_ts;
> 
> Should this be moved out of the if() case?
> 
> I'm thinking of the future where we may end up adding mii timestamper
> support for ACPI.

Right. I'll take case of these in next version.

Thanks
Calvin