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dt-bindings: thermal: make cooling-maps property optional

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Cooling-maps doesn't have to be a required property because there may
be no cooling device on system, or there are no enough cooling devices for
each thermal zone in multiple thermal zone cases since cooling devices
can't be shared.
So make this property optional to remove such limitations.

For thermal zones with no cooling-maps, there could be critic trips
that can trigger CPU reset or shutdown. So they still can take actions.

Signed-off-by: Yuantian Tang <andy.tang@nxp.com>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200309045411.21859-1-andy.tang@nxp.com
This commit is contained in:
Yuantian Tang 2020-03-09 12:54:11 +08:00 committed by Daniel Lezcano
parent 01c354e2ec
commit fd96a316d2
1 changed files with 1 additions and 1 deletions
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Documentation/devicetree/bindings/thermal/thermal.txt
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@ -142,11 +142,11 @@ Required properties:
- trips: A sub-node which is a container of only trip point nodes
Type: sub-node required to describe the thermal zone.
Optional property:
- cooling-maps: A sub-node which is a container of only cooling device
Type: sub-node map nodes, used to describe the relation between trips
and cooling devices.
Optional property:
- coefficients: An array of integers (one signed cell) containing
Type: array coefficients to compose a linear relation between
Elem size: one cell the sensors listed in the thermal-sensors property.