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References: <20201215164315.3666-1-calvin.johnson@oss.nxp.com> <20201215164315.3666-5-calvin.johnson@oss.nxp.com>
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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Tue, 15 Dec 2020 19:28:10 +0200
Message-ID: <CAHp75VcHrBtAY3KDugBYEo9=YuDwbh+QLdOU8yiKb2VyaU2x9A@mail.gmail.com>
Subject: Re: [net-next PATCH v2 04/14] net: phy: Introduce fwnode_get_phy_id()
To:     Calvin Johnson <calvin.johnson@oss.nxp.com>
Cc:     Grant Likely <grant.likely@arm.com>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        Jeremy Linton <jeremy.linton@arm.com>,
        Andrew Lunn <andrew@lunn.ch>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Russell King - ARM Linux admin <linux@armlinux.org.uk>,
        Cristi Sovaiala <cristian.sovaiala@nxp.com>,
        Florin Laurentiu Chiculita <florinlaurentiu.chiculita@nxp.com>,
        Ioana Ciornei <ioana.ciornei@nxp.com>,
        Madalin Bucur <madalin.bucur@oss.nxp.com>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        Marcin Wojtas <mw@semihalf.com>,
        Pieter Jansen Van Vuuren <pieter.jansenvv@bamboosystems.io>,
        Jon <jon@solid-run.com>, "linux.cj" <linux.cj@gmail.com>,
        Laurentiu Tudor <laurentiu.tudor@nxp.com>,
        Diana Madalina Craciun <diana.craciun@nxp.com>,
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        Jakub Kicinski <kuba@kernel.org>
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On Tue, Dec 15, 2020 at 6:44 PM Calvin Johnson
<calvin.johnson@oss.nxp.com> wrote:
>
> Extract phy_id from compatible string. This will be used by
> fwnode_mdiobus_register_phy() to create phy device using the
> phy_id.

...

> +       if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) {
> +               *phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF);
> +               return 0;
> +       }
> +       return -EINVAL;

Perhaps traditional pattern, i.e.
       if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) != 2)
               return -EINVAL;

       *phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF);
       return 0;

And perhaps GENMASK() ?

-- 
With Best Regards,
Andy Shevchenko