CHROMIUM: thermal: of: Add support for hardware-tracked trip points

CHROMIUM: thermal: of: Add support for hardware-tracked trip points

This adds support for hardware-tracked trip points to the device tree
thermal sensor framework.

The framework supports an arbitrary number of trip points. Whenever
the current temperature is updated, the trip points immediately
below and above the current temperature are found. A sensor driver
callback `set_trips' is then called with the temperatures.
If there is no trip point above or below the current temperature,
the passed trip temperature will be LONG_MAX or LONG_MIN respectively.
In this callback, the driver should program the hardware such that
it is notified when either of these trip points are triggered.
When a trip point is triggered, the driver should call
`thermal_zone_device_update' for the respective thermal zone. This
will cause the trip points to be updated again.

If the `set_trips' callback is not implemented (is NULL), the framework
behaves as before.

CQ-DEPEND=CL:*210768
BUG=chrome-os-partner:30834
TEST=None

Change-Id: I33226d2b80f3e71a0c3ca3fbc5718db4e461268f
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Paul Walmsley <pwalmsley@nvidia.com>
Signed-off-by: Wei Ni <wni@nvidia.com>
Reviewed-on: https://chromium-review.googlesource.com/212425
Reviewed-by: Olof Johansson <olofj@chromium.org>
Commit-Queue: Olof Johansson <olofj@chromium.org>
Tested-by: Olof Johansson <olofj@chromium.org>
Reviewed-on: https://chrome-internal-review.googlesource.com/210454
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Tested-by: Dylan Reid <dgreid@chromium.org>
Commit-Queue: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/267514
Tested-by: David Riley <davidriley@chromium.org>
Reviewed-by: David Riley <davidriley@chromium.org>
Commit-Queue: David Riley <davidriley@chromium.org>
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
(cherry-picked from https://chromium.googlesource.com/chromiumos/
 third_party/kernel/+/v3.18 commit 397befabb2a52fc16586509a970f8c98268b8040)