Documentation: devicetree: "linux,usable-memory" property
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  • Documentation: devicetree: "linux,usable-memory" property
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Heinrich Schuchardt Dec. 23, 2016, 4:17 p.m. UTC
Memory nodes may have a "linux,usable-memory" property
overriding the reg property.

This patch adds the missing documentation.

Signed-off-by: Heinrich Schuchardt <>
 Documentation/devicetree/booting-without-of.txt | 4 ++++
 1 file changed, 4 insertions(+)

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diff --git a/Documentation/devicetree/booting-without-of.txt b/Documentation/devicetree/booting-without-of.txt
index 280d283304bb..92712c5604b0 100644
--- a/Documentation/devicetree/booting-without-of.txt
+++ b/Documentation/devicetree/booting-without-of.txt
@@ -981,6 +981,10 @@  compatibility.
       removed later. The kernel can take this into consideration when
       doing nonmovable allocations and when laying out memory zones.
+    - linux,usable-memory : This property overrides the reg property.
+      It can be used if the bootloader changes the reg property to
+      improper values.
   e) The /chosen node
   This node is a bit "special". Normally, that's where Open Firmware