zephyr/samples/bluetooth/hci_uart/dts/arm/nordic/override.dtsi

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/* Keep default IRQ priority low for peripherals to reduce Radio ISR latency.
* ARM Cortex-M4 lowest priority value of 5, i.e. considering Zephyr reserved 2
* levels for Exceptions and ZLI (if enabled).
* ARM Cortex-M0 lowest priority value of 3, i.e. we use it as Zephyr has no
* support for ZLI on Cortex-M0.
*/
#define NRF_DEFAULT_IRQ_PRIORITY 3