linux-kernel - Re: [PATCH V3] net: phy: Add sysfs attribute for PHY c45 identifiers.

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Message-ID: <ZIwUFXOCCKZYSUBi@shell.armlinux.org.uk>
Date:   Fri, 16 Jun 2023 08:49:41 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Jianhui Zhao <zhaojh329@...il.com>
Cc:     andrew@...n.ch, hkallweit1@...il.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] net: phy: Add sysfs attribute for PHY c45 identifiers.

On Wed, Jun 14, 2023 at 09:45:22PM +0800, Jianhui Zhao wrote:
> +static const struct attribute_group phy_dev_c45_ids_group = {
> +	.name = "c45_ids",
> +	.attrs = phy_c45_id_attrs
> +};

One last thing - is there any point to creating these attributes if
the PHY isn't c45?

We could add here:

	.is_visible = phy_dev_c45_visible,

with:

static umode_t phy_dev_c45_visible(struct kobject *kobj,
				   struct attribute *attr, int foo)
{
	struct phy_device *phydev = to_phy_device(kobj_to_dev(kobj));

	return phydev->is_c45 ? attr->mode : 0;
}

which will only show the c45 attributes if the PHY is a c45 PHY.

Andrew, any opinions?

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