netdev - Re: [PATCH net-next] net: phy: switch drivers to use dynamic feature detection

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Date:   Mon, 8 Apr 2019 00:13:12 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Richard Cochran <richardcochran@...il.com>,
        Kevin Hilman <khilman@...libre.com>,
        Heiko Stuebner <heiko@...ech.de>,
        bcm-kernel-feedback-list@...adcom.com, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH net-next] net: phy: switch drivers to use dynamic feature
 detection

On Sun, Apr 07, 2019 at 11:57:13AM +0200, Heiner Kallweit wrote:
> Recently genphy_read_abilities() has been added that dynamically detects
> clause 22 PHY abilities. I *think* this detection should work with all
> supported PHY's, at least for the ones with basic features sets, i.e.
> PHY_BASIC_FEATURES and PHY_GBIT_FEATURES. So let's remove setting these
> features explicitly and rely on phylib feature detection.

Hi Heiner

We could make this a two step process, to avoid regressions. For one
cycle compare genphy_read_abilities() against .features and raise a
WARN_ON() if they differ. And keep using the .features value.

Then a release late, complete the swap removing .features and the
WARN_ON.

	Andrew