From d1f0dbd4bbca380e6ee3bd3812140e24fe008bce Mon Sep 17 00:00:00 2001 From: Andrew Jeffery Date: Tue, 20 Dec 2016 17:45:32 +1030 Subject: [PATCH] mfd: dt: Add ranges, #address-cells and #size-cells as optional properties 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 Acked-by: Rob Herring Signed-off-by: Lee Jones --- Documentation/devicetree/bindings/mfd/mfd.txt | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Documentation/devicetree/bindings/mfd/mfd.txt b/Documentation/devicetree/bindings/mfd/mfd.txt index f1fceeda12f1a..bcb6abb9d413b 100644 --- a/Documentation/devicetree/bindings/mfd/mfd.txt +++ b/Documentation/devicetree/bindings/mfd/mfd.txt @@ -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 { -- 2.39.5