| Pawel Moll | 48ed887 | 2012-09-17 18:40:09 +0100 | [diff] [blame] | 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. |