View source for How to activate HSI and CSI oscillators calibration

==How to activate the calibration==

This is done in the secure monitor device tree, in the stm32mp157c-<board>.dts file.

===Configuring the timers===
The timers used for calibration must be dedicated in the secure context. It cannot be used at the same time by the non-secure world.

Example: timer12-input1 is used for HSI and timer12-input2 for CSI

   &timers12 {
              secure-status = "okay";
              st,hsi-cal-input = <1>;
              st,csi_cal-input = <2>;
   };

   &timers15 {
              secure-status = "disabled";
              st,hsi-cal-input = <7>;
              st,csi_cal-input = <8>;
   };

===Enabling and configuring the calibration service===
This can be done by enabling options inside the [[Clock_device_tree_configuration_-_Bootloader_specific#HSI_and_CSI_clocks_calibration|clock device tree section]]

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{{PublicationRequestId | 10487 | 2019-02-04 | AnneJ}}

[[Category:How to run use cases]]
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