Re: [PATCH net-next] net: phy: realtek: register hwmon thermal zones

[Andrew Lunn <andrew@lunn.ch>]

On Tue, Nov 03, 2026 at 12:21:28PM +0100, Hleb Shauchenka via B4 Relay wrote:
> From: Hleb Shauchenka <me@marleb.org>
> 
> The Realtek PHY hwmon device exposes the PHY temperature, but its
> channel info lacks HWMON_C_REGISTER_TZ, so the hwmon core does not
> register the sensor with the thermal framework and device-tree
> thermal zones that reference the PHY cannot bind.
> 
> Set the flag, as the Aquantia PHY driver does. This lets the RTL8261N
> sensors on the Zyxel XGS1250-12 B1 drive the chassis fan through
> thermal cooling maps.
> 
> Tested on a Zyxel XGS1250-12 B1 with OpenWrt's Linux 6.18.55: the
> three PHY thermal zones register, and an emulated 85 C reading on one
> of them (CONFIG_THERMAL_EMULATION) switches the fan on through the
> existing 80 C trip and off again once cleared.
> 
> This patch was prepared with AI assistance (Claude Opus 5.5 and Sol
> 6.1), which also helped investigate the problem and run the tests on
> my switch.
> 
> Signed-off-by: Hleb Shauchenka <me@marleb.org>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew