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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)