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1 | Kernel driver vexpress | ||
2 | ====================== | ||
3 | |||
4 | Supported systems: | ||
5 | * ARM Ltd. Versatile Express platform | ||
6 | Prefix: 'vexpress' | ||
7 | Datasheets: | ||
8 | * "Hardware Description" sections of the Technical Reference Manuals | ||
9 | for the Versatile Express boards: | ||
10 | http://infocenter.arm.com/help/topic/com.arm.doc.subset.boards.express/index.html | ||
11 | * Section "4.4.14. System Configuration registers" of the V2M-P1 TRM: | ||
12 | http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0447-/index.html | ||
13 | |||
14 | Author: Pawel Moll | ||
15 | |||
16 | Description | ||
17 | ----------- | ||
18 | |||
19 | Versatile Express platform (http://www.arm.com/versatileexpress/) is a | ||
20 | reference & prototyping system for ARM Ltd. processors. It can be set up | ||
21 | from a wide range of boards, each of them containing (apart of the main | ||
22 | chip/FPGA) a number of microcontrollers responsible for platform | ||
23 | configuration and control. Theses microcontrollers can also monitor the | ||
24 | board and its environment by a number of internal and external sensors, | ||
25 | providing information about power lines voltages and currents, board | ||
26 | temperature and power usage. Some of them also calculate consumed energy | ||
27 | and provide a cumulative use counter. | ||
28 | |||
29 | The configuration devices are _not_ memory mapped and must be accessed | ||
30 | via a custom interface, abstracted by the "vexpress_config" API. | ||
31 | |||
32 | As these devices are non-discoverable, they must be described in a Device | ||
33 | Tree passed to the kernel. Details of the DT binding for them can be found | ||
34 | in Documentation/devicetree/bindings/hwmon/vexpress.txt. | ||