Re: [PATCH] thermal/sysfs: Always enable hysteresis write support

[Rafael J. Wysocki]

On Sat, Jan 6, 2024 at 8:16 PM Manaf Meethalavalappu Pallikunhi
<quic_manafm@xxxxxxxxxxx> wrote:
>
> The commit 2e38a2a981b2("thermal/core: Add a generic
> thermal_zone_set_trip() function") adds the support to update
> trip hysteresis even if set_trip_hyst() operation is not defined.
> But during hysteresis attribute creation, if this operation is
> defined then only it enables hysteresis write access. It leads
> to a case where hysteresis sysfs will be read only for a thermal
> zone when its set_trip_hyst() operation is not defined.

Which is by design.

For some thermal zone types (eg. acpi), updating trip hysteresis via
sysfs might lead to incorrect behavior.