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mfd: dt: Add ranges, #address-cells and #size-cells as optional properties

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Whilst describing a device and not a bus, simple-mfd is modelled on
simple-bus where child nodes are iterated and registered as platform
devices. Some complex devices, e.g. the Aspeed LPC controller, can
benefit from address space mapping such that child nodes can use the
regs property to describe their resource offsets within the
multi-function device.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Andrew Jeffery 2016-12-20 17:45:32 +10:30 committed by Lee Jones
parent bbc741c6f4
commit 0894e9875c
1 changed files with 10 additions and 0 deletions
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Documentation/devicetree/bindings/mfd/mfd.txt
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@ -25,6 +25,16 @@ Optional properties:
be used. In the latter case the child devices will be determined by the
operating system.
- ranges: Describes the address mapping relationship to the parent. Should set
the child's base address to 0, the physical address within parent's address
space, and the length of the address map.
- #address-cells: Specifies the number of cells used to represent physical base
addresses. Must be present if ranges is used.
- #size-cells: Specifies the number of cells used to represent the size of an
address. Must be present if ranges is used.
Example:
foo@1000 {