Re: [RFC PATCH 1/2] platform: arm64: qcom-hamoa-ec: monitor Slim 7x legacy sensors

[Guenter Roeck <linux@roeck-us.net>]

On 9/7/26 18:57, Birk Skyum wrote:
> The Yoga Slim 7x EC returns an all-zero response to the reference-board
> thermal capability command. Probe fails even though its legacy RPM and
> thermistor queries work and firmware controls the fan automatically.
> 
> Select a read-only path for the Lenovo compatible. Expose its first RPM
> channel and thermistor through hwmon, validating the transfer length and
> RPM payload count and treating the thermistor's 0xff sentinel as ENODATA.
> Do not enable SCI, register manual cooling controls or send standby
> commands on this path. Keep the reference-board behavior and strict
> capability validation unchanged.
> 
> The transactions are documented by the Yoga's FC22 and FC29/TZ39 DSDT
> methods and Maya Matuszczyk's EC protocol notes. Anvesh Jain P's pending
> fan-profile series also documents the RPM query. This change does not
> include its calibration, LUT programming or temperature reporting.
> 
> Link: https://github.com/aarch64-laptops/build/blob/2e58842f5fa2f87771c2df017ae4d8c65225ef10/misc/lenovo-yoga-slim-7x/acpi/dsdt.dsl
> Link: https://lkml.iu.edu/hypermail/linux/kernel/2607.3/08806.html
> Signed-off-by: Birk Skyum <birk.skyum@pm.me>
> ---
>   Documentation/hwmon/index.rst          |   1 +
>   Documentation/hwmon/qcom-ec.rst        |  40 +++++++

Platform drivers are not documented here. This directory is intended
for hardware moitoring drivers in the drivers/hwmon/ directory.

Guenter