| # Copyright (c) 2021, Linaro ltd |
| # SPDX-License-Identifier: Apache-2.0 |
| |
| description: STM32 HSE Clock |
| |
| compatible: "st,stm32-hse-clock" |
| |
| include: [fixed-clock.yaml] |
| |
| properties: |
| hse-bypass: |
| type: boolean |
| description: | |
| HSE crystal oscillator bypass |
| Set to the property to by-pass the oscillator with an external clock. |
| |
| css-enabled: |
| type: boolean |
| description: | |
| HSE clock security system enabled |
| Set the property to enable the clock security system (CSS) for the HSE clock. |
| |
| If a failure is detected on the HSE clock, the HSE oscillator is automatically disabled, |
| a clock failure event is sent to timers, and a non-maskable interrupt is generated to |
| inform the software about the failure, allowing the MCU to perform rescue operations. |
| See the MCU reference manual for details. |
| |
| The interaction of CSS and low-power modes is unclear from the documentation. |
| For at least some devices Zephyr will reconfigure the clocks on resuming from low-power |
| modes; this will include re-enabling CSS. However it is important that you verify |
| this for your own hardware. |
