linux-kernel - Re: [net-next: PATCH 02/12] net: mdio: switch fixed-link PHYs API to fwnode

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Date:   Tue, 21 Jun 2022 11:22:23 +0200
From:   Marcin Wojtas <mw@...ihalf.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        vivien.didelot@...il.com, Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, pabeni@...hat.com,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Grzegorz Bernacki <gjb@...ihalf.com>,
        Grzegorz Jaszczyk <jaz@...ihalf.com>,
        Tomasz Nowicki <tn@...ihalf.com>,
        Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@....com>,
        upstream@...ihalf.com
Subject: Re: [net-next: PATCH 02/12] net: mdio: switch fixed-link PHYs API to fwnode_

pon., 20 cze 2022 o 19:32 Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> napisał(a):
>
> On Mon, Jun 20, 2022 at 05:02:15PM +0200, Marcin Wojtas wrote:
> > fixed-link PHYs API is used by DSA and a number of drivers
> > and was depending on of_. Switch to fwnode_ so to make it
> > hardware description agnostic and allow to be used in ACPI
> > world as well.
>
> ...
>
> > +bool fwnode_phy_is_fixed_link(struct fwnode_handle *fwnode)
> > +{
> > +     struct fwnode_handle *fixed_link_node;
> > +     const char *managed;
> > +     int len;
> > +
> > +     /* New binding */
> > +     fixed_link_node = fwnode_get_named_child_node(fwnode, "fixed-link");
> > +     if (fixed_link_node) {
> > +             fwnode_handle_put(fixed_link_node);
> > +             return true;
> > +     }
> > +
> > +     if (fwnode_property_read_string(fwnode, "managed", &managed) == 0 &&
> > +         strcmp(managed, "auto") != 0)
> > +             return true;
> > +
> > +     /* Old binding */
> > +     len = fwnode_property_read_u32_array(fwnode, "fixed-link", NULL, 0);
>
>
> fwnode_property_count_u32()
>
> > +     if (len == (5 * sizeof(u32)))
>
> I'm not sure how to interpret this. len will return a count of u32 elements.
> What does the sizeof(u32) mean here?
>

You are right, thanks for spotting. The total byte count remained
after migrating from of_get_property ->
fwnode_property_read_u32_array.

Best regards,
Marcin