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Diffstat (limited to 'Documentation/powerpc/booting-without-of.txt')
| -rw-r--r-- | Documentation/powerpc/booting-without-of.txt | 40 |
1 files changed, 38 insertions, 2 deletions
diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt index d42d98107d49..0c2434822094 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 |