Description¶

Versatile Express platform (http://www.arm.com/versatileexpress/) is areference & prototyping system for ARM Ltd. processors. It can be set upfrom a wide range of boards, each of them containing (apart of the mainchip/FPGA) a number of microcontrollers responsible for platformconfiguration and control. Theses microcontrollers can also monitor theboard and its environment by a number of internal and external sensors,providing information about power lines voltages and currents, boardtemperature and power usage. Some of them also calculate consumed energyand provide a cumulative use counter.

The configuration devices are _not_ memory mapped and must be accessedvia a custom interface, abstracted by the “vexpress_config” API.

As these devices are non-discoverable, they must be described in a DeviceTree passed to the kernel. Details of the DT binding for them can be foundin Documentation/devicetree/bindings/hwmon/vexpress.txt.