Assigning peripherals to cores on the nRF54H20 SoC

Peripherals in the global domain of the nRF54H20 SoC can have global ownership. However, you must assign each peripheral IRQ to a specific core by specifying the peripheral’s interrupt controller and enabling the peripheral in the devicetree. You must also set the peripheral ownership using the status property. By default, the global peripherals are assigned to the application core. Their IRQs are also routed to the application core. To assign a global peripheral to a different core, do the following:

1. Update the global peripheral’s devicetree node in the application core as follows:

   • If the IRQ is forwarded to a VPR that is owned by the application core, set status = "reserved".

   • If the peripheral is assigned to the radio core, set status = "disabled" in the application core devicetree.

See the following example of the application core devicetree forwarding the IRQ to the PPR core (owned by the application core itself):

/* Will be used by PPR core */
&uart135 {
    status = "reserved";
};

1. For global peripherals whose interrupts are routed to the core to which they are assigned, update the interrupt parent in the application core devicetree accordingly:

/* Will be used by FLPR core */
&can120 {
    status = "reserved";
    interrupt-parent = <&cpuflpr_clic>; /* FLPR core's interrupt controller */
};

1. You can now enable and configure the peripheral in the devicetree of the core to which the peripheral is assigned. See the following examples.

   • PPR core devicetree:

   &uart120 {
           status = "okay";
           ...
   };
   

   • FLPR core devicetree:

   &can120 {
           status = "okay";
           ...
   };