linux-kernel - Re: [net-next: PATCH v4 2/8] net: mdio: switch fixed-link PHYs API to fwnode

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Message-ID: <Y8XL+PKLabp9oTsZ@lunn.ch>
Date:   Mon, 16 Jan 2023 23:13:12 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Marcin Wojtas <mw@...ihalf.com>
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        netdev@...r.kernel.org, rafael@...nel.org,
        andriy.shevchenko@...ux.intel.com, sean.wang@...iatek.com,
        Landen.Chao@...iatek.com, linus.walleij@...aro.org,
        vivien.didelot@...il.com, f.fainelli@...il.com, olteanv@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, linux@...linux.org.uk, hkallweit1@...il.com,
        jaz@...ihalf.com, tn@...ihalf.com, Samer.El-Haj-Mahmoud@....com
Subject: Re: [net-next: PATCH v4 2/8] net: mdio: switch fixed-link PHYs API
 to fwnode_

> +int fwnode_phy_register_fixed_link(struct fwnode_handle *fwnode)
> +{
> +	struct fixed_phy_status status = {};
> +	struct fwnode_handle *fixed_link_node;
> +	u32 fixed_link_prop[5];
> +	const char *managed;
> +	int rc;
> +
> +	if (fwnode_property_read_string(fwnode, "managed", &managed) == 0 &&
> +	    strcmp(managed, "in-band-status") == 0) {
> +		/* status is zeroed, namely its .link member */
> +		goto register_phy;
> +	}
> +
> +	/* New binding */
> +	fixed_link_node = fwnode_get_named_child_node(fwnode, "fixed-link");
> +	if (fixed_link_node) {
> +		status.link = 1;
> +		status.duplex = fwnode_property_present(fixed_link_node,
> +							"full-duplex");
> +		rc = fwnode_property_read_u32(fixed_link_node, "speed",
> +					      &status.speed);
> +		if (rc) {
> +			fwnode_handle_put(fixed_link_node);
> +			return rc;
> +		}
> +		status.pause = fwnode_property_present(fixed_link_node, "pause");
> +		status.asym_pause = fwnode_property_present(fixed_link_node,
> +							    "asym-pause");
> +		fwnode_handle_put(fixed_link_node);
> +
> +		goto register_phy;
> +	}
> +
> +	/* Old binding */
> +	rc = fwnode_property_read_u32_array(fwnode, "fixed-link", fixed_link_prop,
> +					    ARRAY_SIZE(fixed_link_prop));
> +	if (rc)
> +		return rc;
> +
> +	status.link = 1;
> +	status.duplex = fixed_link_prop[1];
> +	status.speed  = fixed_link_prop[2];
> +	status.pause  = fixed_link_prop[3];
> +	status.asym_pause = fixed_link_prop[4];

This is one example of the issue i just pointed out. The "Old binding"
has been deprecated for years. Maybe a decade? There is no reason it
should be used in ACPI.

       Andrew