linux-kernel - Re: [PATCH v5 0/2] ethtool: implement Energy Detect Powerdown support via phy-tunable

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Date:   Mon, 16 Sep 2019 22:03:06 +0200 (CEST)
From:   David Miller <davem@...emloft.net>
To:     alexandru.ardelean@...log.com
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        mark.rutland@....com, f.fainelli@...il.com, hkallweit1@...il.com,
        andrew@...n.ch, mkubecek@...e.cz
Subject: Re: [PATCH v5 0/2] ethtool: implement Energy Detect Powerdown
 support via phy-tunable

From: Alexandru Ardelean <alexandru.ardelean@...log.com>
Date: Mon, 16 Sep 2019 10:35:24 +0300

> This changeset proposes a new control for PHY tunable to control Energy
> Detect Power Down.
> 
> The `phy_tunable_id` has been named `ETHTOOL_PHY_EDPD` since it looks like
> this feature is common across other PHYs (like EEE), and defining
> `ETHTOOL_PHY_ENERGY_DETECT_POWER_DOWN` seems too long.
>     
> The way EDPD works, is that the RX block is put to a lower power mode,
> except for link-pulse detection circuits. The TX block is also put to low
> power mode, but the PHY wakes-up periodically to send link pulses, to avoid
> lock-ups in case the other side is also in EDPD mode.
>     
> Currently, there are 2 PHY drivers that look like they could use this new
> PHY tunable feature: the `adin` && `micrel` PHYs.
> 
> This series updates only the `adin` PHY driver to support this new feature,
> as this chip has been tested. A change for `micrel` can be proposed after a
> discussion of the PHY-tunable API is resolved.

Series applied.