linux-kernel - Re: [PATCH v2] thermal: sysfs: Make trip hysteresis writable along with trip temperature

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Date: Thu, 8 Feb 2024 15:42:23 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>,
 Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Lukasz Luba <lukasz.luba@....com>,
 Zhang Rui <rui.zhang@...el.com>,
 Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
 Manaf Meethalavalappu Pallikunhi <quic_manafm@...cinc.com>
Subject: Re: [PATCH v2] thermal: sysfs: Make trip hysteresis writable along
 with trip temperature

On 31/01/2024 19:44, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Trip point temperature can be modified via sysfs if
> CONFIG_THERMAL_WRITABLE_TRIPS is enabled and the thermal
> zone creator requested that the given trip be writable
> in the writable trips mask passed to the registration
> function.
> 
> However, trip point hysteresis is treated differently - it is only
> writable if the thermal zone has a .set_trip_hyst() operation defined
> and neither CONFIG_THERMAL_WRITABLE_TRIPS, nor the writable trips mask
> supplied by the zone creator has any bearing on this.  That is
> inconsistent and confusing, and it generally does not meet user
> expectations.
> 
> For this reason, modify create_trip_attrs() to handle trip point
> hysteresis in the same way as trip point temperature, so they both
> are writable at the same time regardless of what trip point operations
> are defined for the thermal zone.
> 
> Link: https://lore.kernel.org/linux-pm/20240106191502.29126-1-quic_manafm@quicinc.com
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>

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