dt-bindings: chosen: Document linux,initrd-{start,end}

These properties have been in use for a very long time (at least since
2005), but were never documented in chosen.txt.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Rob Herring <robh@kernel.org>

diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt
index e3b13ea..45e7917 100644 (file)
--- a/Documentation/devicetree/bindings/chosen.txt
+++ b/Documentation/devicetree/bindings/chosen.txt
@@ -120,3 +120,18 @@ e.g.
 While this property does not represent a real hardware, the address
 and the size are expressed in #address-cells and #size-cells,
 respectively, of the root node.
+
+linux,initrd-start and linux,initrd-end
+---------------------------------------
+
+These properties hold the physical start and end address of an initrd that's
+loaded by the bootloader. Note that linux,initrd-start is inclusive, but
+linux,initrd-end is exclusive.
+e.g.
+
+/ {
+       chosen {
+               linux,initrd-start = <0x82000000>;
+               linux,initrd-end = <0x82800000>;
+       };
+};