How to activate HSE monitoring

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1. Article purpose[edit source]

The purpose of this article is to explain how to monitor HSE clock.

If HSE is used in your clock tree, this can be a good idea to monitoring HSE to detect and avoid over frequency. The LPTIM mechanism will detect an over frequency and trig a tamper event which runs some actions (STM32MP13_Tamper_configuration).

2. How to activate the monitoring[edit source]

By default, the HSE monitor is disabled in soc secure device tree:

hse_monitor: hse-monitor {
	compatible = "st,freq-monitor";
	counter = <&lptimer3 1 1 0 0>;
	status = "disabled";
};

To activate HSE monitor add this node in your board secure device tree:

	&hse_monitor {
		status = "okay";
	};