linux-kernel - Re: [net-next PATCH v3 4/5] net: phy: Introduce fwnode_get_phy

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Date:   Tue, 5 May 2020 17:15:16 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Calvin Johnson <calvin.johnson@....nxp.com>
Cc:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        linux.cj@...il.com, Jeremy Linton <jeremy.linton@....com>,
        Andrew Lunn <andrew@...n.ch>,
        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>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Varun Sethi <V.Sethi@....com>,
        "Rajesh V . Bikkina" <rajesh.bikkina@....com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Diana Madalina Craciun <diana.craciun@....com>,
        netdev <netdev@...r.kernel.org>, Marcin Wojtas <mw@...ihalf.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Makarand Pawagi <makarand.pawagi@....com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Pankaj Bansal <pankaj.bansal@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [net-next PATCH v3 4/5] net: phy: Introduce fwnode_get_phy_id()

On Tue, May 5, 2020 at 4:29 PM Calvin Johnson
<calvin.johnson@....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.

> +int fwnode_get_phy_id(struct fwnode_handle *fwnode, u32 *phy_id)
> +{
> +       const char *cp;
> +       unsigned int upper, lower;
> +       int ret;
> +
> +       ret = fwnode_property_read_string(fwnode, "compatible", &cp);
> +       if (!ret) {

if (ret)
 return ret;

will help a lot with readability of this.

> +               if (sscanf(cp, "ethernet-phy-id%4x.%4x",
> +                          &upper, &lower) == 2) {

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

How upper can be bigger than 0xfff? Same for lower.

> +                       return 0;
> +               }
> +       }
> +       return -EINVAL;
> +}

-- 
With Best Regards,
Andy Shevchenko