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-rw-r--r--Documentation/powerpc/booting-without-of.txt40
1 files changed, 38 insertions, 2 deletions
diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt
index d42d981..0c24348 100644
--- a/Documentation/powerpc/booting-without-of.txt
+++ b/Documentation/powerpc/booting-without-of.txt
@@ -42,15 +42,16 @@ Table of Contents
1) Defining child nodes of an SOC
2) Representing devices without a current OF specification
a) MDIO IO device
- c) PHY nodes
b) Gianfar-compatible ethernet nodes
+ c) PHY nodes
d) Interrupt controllers
e) I2C
f) Freescale SOC USB controllers
g) Freescale SOC SEC Security Engines
h) Board Control and Status (BCSR)
i) Freescale QUICC Engine module (QE)
- g) Flash chip nodes
+ j) Flash chip nodes
+ k) Global Utilities Block
VII - Specifying interrupt information for devices
1) interrupts property
@@ -626,6 +627,14 @@ So the node content can be summarized as a start token, a full path,
a list of properties, a list of child nodes, and an end token. Every
child node is a full node structure itself as defined above.
+NOTE: The above definition requires that all property definitions for
+a particular node MUST precede any subnode definitions for that node.
+Although the structure would not be ambiguous if properties and
+subnodes were intermingled, the kernel parser requires that the
+properties come first (up until at least 2.6.22). Any tools
+manipulating a flattened tree must take care to preserve this
+constraint.
+
4) Device tree "strings" block
In order to save space, property names, which are generally redundant,
@@ -1782,6 +1791,33 @@ platforms are moved over to use the flattened-device-tree model.
partition-names = "fs\0firmware";
};
+ k) Global Utilities Block
+
+ The global utilities block controls power management, I/O device
+ enabling, power-on-reset configuration monitoring, general-purpose
+ I/O signal configuration, alternate function selection for multiplexed
+ signals, and clock control.
+
+ Required properties:
+
+ - compatible : Should define the compatible device type for
+ global-utilities.
+ - reg : Offset and length of the register set for the device.
+
+ Recommended properties:
+
+ - fsl,has-rstcr : Indicates that the global utilities register set
+ contains a functioning "reset control register" (i.e. the board
+ is wired to reset upon setting the HRESET_REQ bit in this register).
+
+ Example:
+
+ global-utilities@e0000 { /* global utilities block */
+ compatible = "fsl,mpc8548-guts";
+ reg = <e0000 1000>;
+ fsl,has-rstcr;
+ };
+
More devices will be defined as this spec matures.
VII - Specifying interrupt information for devices
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