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Documentation: arm: Link idle-states binding to "enable-method" property 

The "enable-method" property for cpu nodes needs to be "psci" for CPU
idle management to be setup correctly.

Add a note to the binding documentation to this effect to make it
obvious.

Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Amit Kucheria 2019-05-21 15:05:12 +05:30 committed by Rob Herring
parent 573748081a
commit 4c0a59e112
1 changed files with 10 additions and 3 deletions
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13
Documentation/devicetree/bindings/arm/idle-states.txt
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@ -241,9 +241,13 @@ processor idle states, defined as device tree nodes, are listed.
- "psci"
# On ARM 32-bit systems this property is optional
The nodes describing the idle states (state) can only be defined within the
idle-states node, any other configuration is considered invalid and therefore
must be ignored.
This assumes that the "enable-method" property is set to "psci" in the cpu
node[6] that is responsible for setting up CPU idle management in the OS
implementation.
The nodes describing the idle states (state) can only be defined
within the idle-states node, any other configuration is considered invalid
and therefore must be ignored.
===========================================
4 - state node
@ -697,3 +701,6 @@ cpus {
[5] Devicetree Specification
https://www.devicetree.org/specifications/
[6] ARM Linux Kernel documentation - Booting AArch64 Linux
Documentation/arm64/booting.txt