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Currently, OMAP3_THERMAL is disabled by default, so the bandgap sensor
is unavailable, and enabling it will somewhat increase power consumption.
However for boards which operate near their thermal limit, OMAP3_THERMAL
can be enabled and monitored to keep the processor from either running
too fast, or shutdown when it's deemed to be operating at an unsafe
thermal limit at the expense of increased power consumption.
The OMAP3530, OMAP3630, and DM3730 all show thresholds of 90C and 105C
depending on commercial or extended temperature ratings.
This patch expands the thermal information to include the limits of
80C for alert and 90C critical based on commercial temperature rating.
It sets the coolings-cells for the 34xx and 36xx CPU's which will start
to throttle back their maximum frequency when the bangap sensor reads
above the alert temerature of 80C.
For boards who which to increase the temperatures for extended
temperature ratings, these can be changed on their respective
device trees with something like:
&cpu_alert0 {
temperature = <90000>; /* millicelsius */
};
&cpu_crit {
temperature = <105000>; /* millicelsius */
};
Signed-off-by: Adam Ford <aford173@gmail.com>
Tested-by: H. Nikolaus Schaller <hns@goldelico.com> # on GTA04A5 with dm3730cbp100
Signed-off-by: Tony Lindgren <tony@atomide.com>
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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.
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.