From 16b0b2baaf83f0fed8fa561d40a1bd3cefae454a Mon Sep 17 00:00:00 2001 From: Rob Herring Date: Thu, 8 Oct 2020 09:24:19 -0500 Subject: dt-bindings: powerpc: Add a schema for the 'sleep' property Document the PowerPC specific 'sleep' property as a schema. It is currently only documented in booting-without-of.rst which is getting removed. Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Signed-off-by: Rob Herring Link: https://lore.kernel.org/r/20201008142420.2083861-1-robh@kernel.org Signed-off-by: Rob Herring --- .../devicetree/bindings/powerpc/sleep.yaml | 47 ++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 Documentation/devicetree/bindings/powerpc/sleep.yaml (limited to 'Documentation/devicetree/bindings/powerpc') diff --git a/Documentation/devicetree/bindings/powerpc/sleep.yaml b/Documentation/devicetree/bindings/powerpc/sleep.yaml new file mode 100644 index 000000000000..6494c7d08b93 --- /dev/null +++ b/Documentation/devicetree/bindings/powerpc/sleep.yaml @@ -0,0 +1,47 @@ +# SPDX-License-Identifier: GPL-2.0-only +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/powerpc/sleep.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: PowerPC sleep property + +maintainers: + - Rob Herring + +description: | + Devices on SOCs often have mechanisms for placing devices into low-power + states that are decoupled from the devices' own register blocks. Sometimes, + this information is more complicated than a cell-index property can + reasonably describe. Thus, each device controlled in such a manner + may contain a "sleep" property which describes these connections. + + The sleep property consists of one or more sleep resources, each of + which consists of a phandle to a sleep controller, followed by a + controller-specific sleep specifier of zero or more cells. + + The semantics of what type of low power modes are possible are defined + by the sleep controller. Some examples of the types of low power modes + that may be supported are: + + - Dynamic: The device may be disabled or enabled at any time. + - System Suspend: The device may request to be disabled or remain + awake during system suspend, but will not be disabled until then. + - Permanent: The device is disabled permanently (until the next hard + reset). + + Some devices may share a clock domain with each other, such that they should + only be suspended when none of the devices are in use. Where reasonable, + such nodes should be placed on a virtual bus, where the bus has the sleep + property. If the clock domain is shared among devices that cannot be + reasonably grouped in this manner, then create a virtual sleep controller + (similar to an interrupt nexus, except that defining a standardized + sleep-map should wait until its necessity is demonstrated). + +select: true + +properties: + sleep: + $ref: /schemas/types.yaml#definitions/phandle-array + +additionalProperties: true -- cgit v1.2.3