linux-kernel - Re: [net-next PATCH v2 02/14] net: phy: Introduce phy related fwnode functions

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Message-ID: <CAHp75VeJc6jXAi9LV84+-paH+8Xx7+-6vtfSe+G5eoFn2VRErg@mail.gmail.com>
Date:   Tue, 15 Dec 2020 19:23:26 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Calvin Johnson <calvin.johnson@....nxp.com>
Cc:     Grant Likely <grant.likely@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Andrew Lunn <andrew@...n.ch>,
        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>,
        Marcin Wojtas <mw@...ihalf.com>,
        Pieter Jansen Van Vuuren <pieter.jansenvv@...boosystems.io>,
        Jon <jon@...id-run.com>, "linux.cj" <linux.cj@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Diana Madalina Craciun <diana.craciun@....com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [net-next PATCH v2 02/14] net: phy: Introduce phy related fwnode functions

On Tue, Dec 15, 2020 at 6:44 PM Calvin Johnson
<calvin.johnson@....nxp.com> wrote:
>
> Define fwnode_phy_find_device() to iterate an mdiobus and find the
> phy device of the provided phy fwnode. Additionally define
> device_phy_find_device() to find phy device of provided device.
>
> Define fwnode_get_phy_node() to get phy_node using named reference.

...

> +#include <linux/acpi.h>

Not sure we need this. See below.

...

> +/**
> + * fwnode_phy_find_device - Find phy_device on the mdiobus for the provided
> + * phy_fwnode.

Can we keep a summary on one line?

> + * @phy_fwnode: Pointer to the phy's fwnode.
> + *
> + * If successful, returns a pointer to the phy_device with the embedded
> + * struct device refcount incremented by one, or NULL on failure.
> + */
> +struct phy_device *fwnode_phy_find_device(struct fwnode_handle *phy_fwnode)
> +{
> +       struct mdio_device *mdiodev;
> +       struct device *d;

> +       if (!phy_fwnode)
> +               return NULL;

Why is this needed?
Perhaps a comment to the function description explains a case when
@phy_fwnode == NULL.

> +       d = bus_find_device_by_fwnode(&mdio_bus_type, phy_fwnode);
> +       if (d) {
> +               mdiodev = to_mdio_device(d);
> +               if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
> +                       return to_phy_device(d);
> +               put_device(d);
> +       }
> +
> +       return NULL;
> +}

...

> + * For ACPI, only "phy-handle" is supported. DT supports all the three
> + * named references to the phy node.

...

> +       /* Only phy-handle is used for ACPI */
> +       phy_node = fwnode_find_reference(fwnode, "phy-handle", 0);
> +       if (is_acpi_node(fwnode) || !IS_ERR(phy_node))
> +               return phy_node;

So, what is the problem with going through the rest on ACPI?
Usually we describe the restrictions in the documentation.

-- 
With Best Regards,
Andy Shevchenko