linux-kernel - Re: [net-next PATCH v5 13/15] phylink: introduce phylink_fwnode_phy

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Message-ID: <20210208153111.GK1463@shell.armlinux.org.uk>
Date:   Mon, 8 Feb 2021 15:31:11 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
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>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        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>,
        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>, Saravana Kannan <saravanak@...gle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        linux-kernel@...r.kernel.org, linux.cj@...il.com,
        Diana Madalina Craciun <diana.craciun@....com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-acpi@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [net-next PATCH v5 13/15] phylink: introduce
 phylink_fwnode_phy_connect()

On Mon, Feb 08, 2021 at 08:42:42PM +0530, Calvin Johnson wrote:
> +int phylink_fwnode_phy_connect(struct phylink *pl,
> +			       struct fwnode_handle *fwnode,
> +			       u32 flags)
> +{
> +	struct fwnode_handle *phy_fwnode;
> +	struct phy_device *phy_dev;
> +	int ret;
> +
> +	if (is_of_node(fwnode)) {
> +		/* Fixed links and 802.3z are handled without needing a PHY */
> +		if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
> +		    (pl->cfg_link_an_mode == MLO_AN_INBAND &&
> +		     phy_interface_mode_is_8023z(pl->link_interface)))
> +			return 0;

This difference between ACPI and DT really needs to be described in the
commit description.

For example, why is it acceptable to have a PHY in fixed-link mode if
we're using ACPI, and not DT?

If we look at the phylink code, accepting a PHY when in fixed-link mode
is basically not supported... so why should ACPI allow this?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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