June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Labels and interrupts
The structure of the device tree described so far assumes that there is a single hierarchy of components, whereas in fact there are several. As well as the obvious data connection between a component and other parts of the system, it might also be connected to an interrupt controller, to a clock source, and to a voltage regulator. To express these connections, we can add a label to a node and reference the label from other nodes. These labels are sometimes referred to as phandles, because when the device tree is compiled, nodes with a reference from another node are assigned a unique numerical value in a property called phandle. You can see them if you decompile the device tree binary.
Take as an example a system containing ...
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