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Stefan Wahren be3035e362 ARM: bcm2835: Add GET_THROTTLED firmware property
Recent Raspberry Pi firmware provides a mailbox property to detect
under-voltage conditions. Here is the current definition.

The u32 value returned by the firmware is divided into 2 parts:
  - lower 16-bits are the live value
  - upper 16-bits are the history or sticky value

  Bits:
  0: undervoltage
  1: arm frequency capped
  2: currently throttled
  16: undervoltage has occurred
  17: arm frequency capped has occurred
  18: throttling has occurred

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
History 2018-06-21 17:17:11 -07:00
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Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.