netdev - Re: [net-next PATCH v1 3/7] net: phy: Introduce fwnode_get_phy

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Date:   Sat, 3 Oct 2020 23:30:34 +0530
From:   Calvin Johnson <calvin.johnson@....nxp.com>
To:     Grant Likely <grant.likely@....com>
Cc:     "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>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        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>,
        linux-kernel@...r.kernel.org, linux.cj@...il.com,
        netdev@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Diana Madalina Craciun <diana.craciun@....com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>, nd <nd@....com>
Subject: Re: [net-next PATCH v1 3/7] net: phy: Introduce fwnode_get_phy_id()

On Fri, Oct 02, 2020 at 12:05:14PM +0100, Grant Likely wrote:
> 
> 
> On 30/09/2020 17:04, Calvin Johnson wrote:
> > Extract phy_id from compatible string. This will be used by
> > fwnode_mdiobus_register_phy() to create phy device using the
> > phy_id.
> > 
> > Signed-off-by: Calvin Johnson <calvin.johnson@....nxp.com>
> > ---
> > 
> >   drivers/net/phy/phy_device.c | 32 +++++++++++++++++++++++++++++++-
> >   include/linux/phy.h          |  5 +++++
> >   2 files changed, 36 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> > index c4aec56d0a95..162abde6223d 100644
> > --- a/drivers/net/phy/phy_device.c
> > +++ b/drivers/net/phy/phy_device.c
> > @@ -9,6 +9,7 @@
> >   #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> > +#include <linux/acpi.h>
> >   #include <linux/bitmap.h>
> >   #include <linux/delay.h>
> >   #include <linux/errno.h>
> > @@ -845,6 +846,27 @@ static int get_phy_c22_id(struct mii_bus *bus, int addr, u32 *phy_id)
> >   	return 0;
> >   }
> > +/* Extract the phy ID from the compatible string of the form
> > + * ethernet-phy-idAAAA.BBBB.
> > + */
> > +int fwnode_get_phy_id(struct fwnode_handle *fwnode, u32 *phy_id)
> > +{
> > +	unsigned int upper, lower;
> > +	const char *cp;
> > +	int ret;
> > +
> > +	ret = fwnode_property_read_string(fwnode, "compatible", &cp);
> > +	if (ret)
> > +		return ret;
> > +
> > +	if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) {
> > +		*phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF);
> > +		return 0;
> > +	}
> > +	return -EINVAL;
> > +}
> > +EXPORT_SYMBOL(fwnode_get_phy_id);
> 
> This block, and the changes in patch 4 duplicate functions from
> drivers/of/of_mdio.c, but it doesn't refactor anything in
> drivers/of/of_mdio.c to use the new path. Is your intent to bring all of the
> parsing in these functions of "compatible" into the ACPI code path?
> 
> If so, then the existing code path needs to be refactored to work with
> fwnode_handle instead of device_node.
> 
> If not, then the DT path in these functions should call out to of_mdio,
> while the ACPI path only does what is necessary.

I'll work on refactoring as Florian and Rob are also suggesting the same.

Thanks
Calvin