[PATCH net-next 0/2] Add further DT configuration for AT803x PHYs - Russell King

From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Andrew Lunn <andrew@lunn.ch>, Heiner Kallweit <hkallweit1@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>,
	devicetree@vger.kernel.org,
	Florian Fainelli <f.fainelli@gmail.com>,
	Jakub Kicinski <kuba@kernel.org>,
	netdev@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	Jon Nettleton <jon@solid-run.com>
Subject: [PATCH net-next 0/2] Add further DT configuration for AT803x PHYs
Date: Thu, 14 Jan 2021 10:44:56 +0000	[thread overview]
Message-ID: <20210114104455.GP1551@shell.armlinux.org.uk> (raw)

Hi,

This patch series adds the ability to configure the SmartEEE feature
in AT803x PHYs. SmartEEE defaults to enabled on these PHYs, and has
a history of causing random sporadic link drops at Gigabit speeds.

There appears to be two solutions to this. There is the approach that
Freescale adopted early on, which is to disable the SmartEEE feature.
However, this loses the power saving provided by EEE. Another solution
was found by Jon Nettleton is to increase the Tw parameter for Gigabit
links.

This patch series adds support for both approaches, by adding a boolean:

	qca,disable-smarteee

if one wishes to disable SmartEEE, and two properties to configure the
SmartEEE Tw parameters:

	qca,smarteee-tw-us-100m
	qca,smarteee-tw-us-1g

Sadly, the PHY quirk I merged a while back for AT8035 on iMX6 is broken 
- rather than disabling SmartEEE mode, it enables it.

The addition of these properties will be sent to the appropriate
platform maintainers - although for SolidRun platforms, we only make use
of "qca,smarteee-tw-us-1g".

 .../devicetree/bindings/net/qca,ar803x.yaml        | 16 ++++++
 drivers/net/phy/at803x.c                           | 65 +++++++++++++++++++++-
 2 files changed, 80 insertions(+), 1 deletion(-)

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