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-Marvell ICU Interrupt Controller
---------------------------------
-
-The Marvell ICU (Interrupt Consolidation Unit) controller is
-responsible for collecting all wired-interrupt sources in the CP and
-communicating them to the GIC in the AP, the unit translates interrupt
-requests on input wires to MSG memory mapped transactions to the GIC.
-These messages will access a different GIC memory area depending on
-their type (NSR, SR, SEI, REI, etc).
-
-Required properties:
-
-- compatible: Should be "marvell,cp110-icu"
-
-- reg: Should contain ICU registers location and length.
-
-Subnodes: Each group of interrupt is declared as a subnode of the ICU,
-with their own compatible.
-
-Required properties for the icu_nsr/icu_sei subnodes:
-
-- compatible: Should be one of:
- * "marvell,cp110-icu-nsr"
- * "marvell,cp110-icu-sr"
- * "marvell,cp110-icu-sei"
- * "marvell,cp110-icu-rei"
-
-- #interrupt-cells: Specifies the number of cells needed to encode an
- interrupt source. The value shall be 2.
-
- The 1st cell is the index of the interrupt in the ICU unit.
-
- The 2nd cell is the type of the interrupt. See arm,gic.txt for
- details.
-
-- interrupt-controller: Identifies the node as an interrupt
- controller.
-
-- msi-parent: Should point to the GICP controller, the GIC extension
- that allows to trigger interrupts using MSG memory mapped
- transactions.
-
-Note: each 'interrupts' property referring to any 'icu_xxx' node shall
- have a different number within [0:206].
-
-Example:
-
-icu: interrupt-controller@1e0000 {
- compatible = "marvell,cp110-icu";
- reg = <0x1e0000 0x440>;
-
- CP110_LABEL(icu_nsr): interrupt-controller@10 {
- compatible = "marvell,cp110-icu-nsr";
- reg = <0x10 0x20>;
- #interrupt-cells = <2>;
- interrupt-controller;
- msi-parent = <&gicp>;
- };
-
- CP110_LABEL(icu_sei): interrupt-controller@50 {
- compatible = "marvell,cp110-icu-sei";
- reg = <0x50 0x10>;
- #interrupt-cells = <2>;
- interrupt-controller;
- msi-parent = <&sei>;
- };
-};
-
-node1 {
- interrupt-parent = <&icu_nsr>;
- interrupts = <106 IRQ_TYPE_LEVEL_HIGH>;
-};
-
-node2 {
- interrupt-parent = <&icu_sei>;
- interrupts = <107 IRQ_TYPE_LEVEL_HIGH>;
-};
-
-/* Would not work with the above nodes */
-node3 {
- interrupt-parent = <&icu_nsr>;
- interrupts = <107 IRQ_TYPE_LEVEL_HIGH>;
-};
-
-The legacy bindings were different in this way:
-
-- #interrupt-cells: The value was 3.
- The 1st cell was the group type of the ICU interrupt. Possible
- group types were:
- ICU_GRP_NSR (0x0) : Shared peripheral interrupt, non-secure
- ICU_GRP_SR (0x1) : Shared peripheral interrupt, secure
- ICU_GRP_SEI (0x4) : System error interrupt
- ICU_GRP_REI (0x5) : RAM error interrupt
- The 2nd cell was the index of the interrupt in the ICU unit.
- The 3rd cell was the type of the interrupt. See arm,gic.txt for
- details.
-
-Example:
-
-icu: interrupt-controller@1e0000 {
- compatible = "marvell,cp110-icu";
- reg = <0x1e0000 0x440>;
-
- #interrupt-cells = <3>;
- interrupt-controller;
- msi-parent = <&gicp>;
-};
-
-node1 {
- interrupt-parent = <&icu>;
- interrupts = <ICU_GRP_NSR 106 IRQ_TYPE_LEVEL_HIGH>;
-};