linux-kernel - Re: [PATCH 2/7] phy: Add driver for EyeQ5 Ethernet PHY wrapper

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Message-Id: <DDUX5TR1VIR9.1KDDNA4XZ6JYW@bootlin.com>
Date: Wed, 29 Oct 2025 16:42:41 +0100
From: Théo Lebrun <theo.lebrun@...tlin.com>
To: Théo Lebrun <theo.lebrun@...tlin.com>, "Vladimir
 Kondratiev" <vladimir.kondratiev@...ileye.com>,
 Grégory Clement <gregory.clement@...tlin.com>, "Rob
 Herring" <robh@...nel.org>, "Krzysztof Kozlowski" <krzk+dt@...nel.org>,
 "Conor Dooley" <conor+dt@...nel.org>, "Vinod Koul" <vkoul@...nel.org>,
 "Kishon Vijay Abraham I" <kishon@...nel.org>, "Michael Turquette"
 <mturquette@...libre.com>, "Stephen Boyd" <sboyd@...nel.org>, "Philipp
 Zabel" <p.zabel@...gutronix.de>, "Thomas Bogendoerfer"
 <tsbogend@...ha.franken.de>
Cc: <linux-mips@...r.kernel.org>, <devicetree@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <linux-phy@...ts.infradead.org>,
 <linux-clk@...r.kernel.org>, Benoît Monin
 <benoit.monin@...tlin.com>, "Maxime Chevallier"
 <maxime.chevallier@...tlin.com>, "Tawfik Bayouk"
 <tawfik.bayouk@...ileye.com>, "Thomas Petazzoni"
 <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 2/7] phy: Add driver for EyeQ5 Ethernet PHY wrapper

Hello all,

On Wed Oct 22, 2025 at 5:39 PM CEST, Théo Lebrun wrote:
> EyeQ5 embeds a system-controller called OLB. It features many unrelated
> registers, and some of those are registers used to configure the
> integration of the RGMII/SGMII Cadence PHY used by MACB/GEM instances.
>
> Wrap in a neat generic PHY provider, exposing two PHYs with standard
> phy_init() / phy_set_mode() / phy_power_on() operations.

I am curious if anyone has feedback on this generic PHY driver? Patches
on MACB landed in net-next [0]. If the phy-eyeq5-eth driver approach
doesn't fly then I should sync with net land to revert MACB patches as
they are useless unless we have phy-eyeq5-eth merged.

V2 changelog at the moment (will wait a few more days before sending):
 - Acked-by: Conor Dooley on dt-bindings patch.
 - ptrdiff_t is printed using %td not %ld; warning on 32-bit archs [1].

[0]: https://lore.kernel.org/lkml/176166121351.2249512.7238254409117352079.git-patchwork-notify@kernel.org/
[1]: https://netdev.bots.linux.dev/static/nipa/1014126/14277857/build_32bit/stderr

Thanks!

--
Théo Lebrun, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com