[PATCH v2] powerpc: #address-cells & #size-cells properties not inherited
Mark A. Greer
mgreer at mvista.com
Fri Jan 4 02:40:47 EST 2008
From: Mark A. Greer <mgreer at mvista.com>
Fix error in booting-without-of.txt that indicates that a node can inherit
its #address-cells and #size-cells definitions from its parent's parent.
This is not correct.
Signed-off-by: Mark A. Greer <mgreer at mvista.com>
Documentation/powerpc/booting-without-of.txt | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt
index ee0209a..58db5ea 100644
@@ -671,10 +671,10 @@ device or bus to be described by the device tree.
In general, the format of an address for a device is defined by the
parent bus type, based on the #address-cells and #size-cells
-property. In the absence of such a property, the parent's parent
-values are used, etc... The kernel requires the root node to have
-those properties defining addresses format for devices directly mapped
-on the processor bus.
+properties. Note that the parent's parent definitions of #address-cells
+and #size-cells are not inhereted so every node with children must specify
+them. The kernel requires the root node to have those properties defining
+addresses format for devices directly mapped on the processor bus.
Those 2 properties define 'cells' for representing an address and a
size. A "cell" is a 32-bit number. For example, if both contain 2
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