Difference between revisions of "DTS internal peripheral"

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1 Peripheral overview[edit]

The DTS peripheral is used to monitor the device temperature and take some preventive action (like frequency scaling or peripheral disabling) in case it is becoming too high and before destroying the component.

1.1 Features[edit]

Refer to the STM32MP15 reference manuals for the complete list of features , and to the software components, introduced below, to see which features are implemented.

1.2 Security support[edit]

The DTS is a non secure peripheral.

2 Peripheral usage and associated software[edit]

2.1 Boot time[edit]

DTS is not used at boot time.

2.2 Runtime[edit]

2.2.1 Overview[edit]

The device cannot warm up if the Cortex®-M4 is running alone, as a consequence the monitoring is only done from the Cortex-A7 non-secure context with Linux®thermal management framework.

2.2.2 Software frameworks[edit]

Domain Peripheral Software frameworks Comment
Cortex-A7
secure
(OP-TEE)
Cortex-A7
non-secure
(Linux)
Cortex-M4

(STM32Cube)
Power & Thermal DTS Linux thermal framework

2.2.3 Peripheral configuration[edit]

The configuration is applied by the firmware running in the context to which the peripheral is assigned. The configuration can be done alone via the STM32CubeMX tool for all internal peripherals, and then manually completed (particularly for external peripherals), according to the information given in the corresponding software framework article.

2.2.4 Peripheral assignment[edit]

Internal peripherals

Check boxes illustrate the possible peripheral allocations supported by STM32 MPU Embedded Software:

  • means that the peripheral can be assigned () to the given runtime context.
  • is used for system peripherals that cannot be unchecked because they are statically connected in the device.

Refer to How to assign an internal peripheral to a runtime context for more information on how to assign peripherals manually or via STM32CubeMX.
The present chapter describes STMicroelectronics recommendations or choice of implementation. Additional possiblities might be described in STM32MP15 reference manuals.

Domain Peripheral Runtime allocation Comment
Instance Cortex-A7
secure
(OP-TEE)
Cortex-A7
non-secure
(Linux)
Cortex-M4

(STM32Cube)
Power & Thermal DTS DTS

3 References[edit]

Device Tree Source (in software context) or Digital Temperature Sensor (in peripheral context)

Open Portable Trusted Execution Environment

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