Commit 76a96d86 authored by Laura Abbott's avatar Laura Abbott Committed by Greg Kroah-Hartman

devicetree: bindings for Ion

This adds a base set of devicetree bindings for the Ion memory
manager. This supports setting up the generic set of heaps and
their properties.
Signed-off-by: default avatarLaura Abbott <labbott@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 02b23803
Ion Memory Manager
Ion is a memory manager that allows for sharing of buffers via dma-buf.
Ion allows for different types of allocation via an abstraction called
a 'heap'. A heap represents a specific type of memory. Each heap has
a different type. There can be multiple instances of the same heap
type.
Specific heap instances are tied to heap IDs. Heap IDs are not to be specified
in the devicetree.
Required properties for Ion
- compatible: "linux,ion" PLUS a compatible property for the device
All child nodes of a linux,ion node are interpreted as heaps
required properties for heaps
- compatible: compatible string for a heap type PLUS a compatible property
for the specific instance of the heap. Current heap types
-- linux,ion-heap-system
-- linux,ion-heap-system-contig
-- linux,ion-heap-carveout
-- linux,ion-heap-chunk
-- linux,ion-heap-dma
-- linux,ion-heap-custom
Optional properties
- memory-region: A phandle to a memory region. Required for DMA heap type
(see reserved-memory.txt for details on the reservation)
Example:
ion {
compatbile = "hisilicon,ion", "linux,ion";
ion-system-heap {
compatbile = "hisilicon,system-heap", "linux,ion-heap-system"
};
ion-camera-region {
compatible = "hisilicon,camera-heap", "linux,ion-heap-dma"
memory-region = <&camera_region>;
};
ion-fb-region {
compatbile = "hisilicon,fb-heap", "linux,ion-heap-dma"
memory-region = <&fb_region>;
};
}
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment