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

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@kernel.org>
Cc: Daniel Lezcano <redacted>
Cc: linux-pm@vger.kernel.org
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Maxime Ripard <redacted>
---
 Documentation/devicetree/bindings/thermal/thermal-zones.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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

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