[PATCH 33/54] dt-bindings: thermal: Make trips node optional

[Rob Herring]

On Wed, 21 Jul 2021 16:04:03 +0200, Maxime Ripard wrote:
> Even though the previous binding made it a required child node, the
> implementation in Linux never made it mandatory and just ignored thermal
> zones without trip points.
> 
> This was even effectively encouraged, since the thermal core wouldn't
> allow a thermal sensor to probe without a thermal zone.
> 
> In the case where you had a thermal device that had multiple sensors but
> with enough knowledge to provide trip points for only a few of them,
> this meant that the only way to make that driver probe was to provide a
> thermal zone without the trips node required by the binding.
> 
> This obviously led to a fair number of device trees doing exactly that,
> making the initial binding requirement ineffective.
> 
> Let's make it clear by dropping that requirement.
> 
> Cc: Amit Kucheria <amitk at kernel.org>
> Cc: Daniel Lezcano <daniel.lezcano at linaro.org>
> Cc: linux-pm at vger.kernel.org
> Cc: Zhang Rui <rui.zhang at intel.com>
> Signed-off-by: Maxime Ripard <maxime at cerno.tech>
> ---
>  Documentation/devicetree/bindings/thermal/thermal-zones.yaml | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring <robh at kernel.org>