From: Marek Vasut <marex@nabladev.com>
To: Fidelio Lawson <lawson.fidelio@gmail.com>,
Woojung Huh <woojung.huh@microchip.com>,
UNGLinuxDriver@microchip.com, Andrew Lunn <andrew@lunn.ch>,
Vladimir Oltean <olteanv@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Marek Vasut <marex@denx.de>,
Maxime Chevallier <maxime.chevallier@bootlin.com>,
Simon Horman <horms@kernel.org>,
Heiner Kallweit <hkallweit1@gmail.com>,
Russell King <linux@armlinux.org.uk>,
Tristram Ha <Tristram.Ha@microchip.com>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Fidelio Lawson <fidelio.lawson@exotec.com>
Subject: Re: [PATCH v6 3/3] net: phy: micrel: expose KSZ87xx low-loss cable tunables
Date: Wed, 20 May 2026 14:00:55 +0200 [thread overview]
Message-ID: <26199882-dfcd-4ed4-b657-d640f4ea7cc3@nabladev.com> (raw)
In-Reply-To: <20260520-ksz87xx_errata_low_loss_connections-v6-3-43f33d4aaf0f@exotec.com>
On 5/20/26 10:48 AM, Fidelio Lawson wrote:
> Add support for the KSZ87xx low-loss cable PHY tunables in the Micrel
> PHY driver by implementing get_tunable and set_tunable callbacks.
>
> These callbacks expose vendor-specific PHY tunables used to control the
> KSZ87xx embedded PHY receiver behavior when operating with short or
> low-loss Ethernet cables. The tunables provide:
>
> - a boolean short-cable preset applying known good settings;
> - an integer LPF bandwidth control;
> - an integer DSP EQ initial value control.
>
> The Micrel PHY driver forwards these tunables via standard phy_read() /
> phy_write() operations, which are virtualized by the KSZ8 DSA driver and
> translated into the appropriate indirect switch register accesses.
>
> Signed-off-by: Fidelio Lawson <fidelio.lawson@exotec.com>
Reviewed-by: Marek Vasut <marex@nabladev.com>
next prev parent reply other threads:[~2026-05-20 15:08 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-20 8:48 [PATCH v6 0/3] ksz87xx: add support for low-loss cable equalizer errata Fidelio Lawson
2026-05-20 8:48 ` [PATCH v6 1/3] net: dsa: microchip: implement KSZ87xx Module 3 low-loss cable errata Fidelio Lawson
2026-05-20 11:47 ` Marek Vasut
2026-05-20 8:48 ` [PATCH v6 2/3] net: ethtool: add KSZ87xx low-loss cable PHY tunables Fidelio Lawson
2026-05-20 11:53 ` Marek Vasut
2026-05-20 8:48 ` [PATCH v6 3/3] net: phy: micrel: expose KSZ87xx low-loss cable tunables Fidelio Lawson
2026-05-20 12:00 ` Marek Vasut [this message]
2026-05-22 17:15 ` [PATCH v6 0/3] ksz87xx: add support for low-loss cable equalizer errata Jakub Kicinski
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