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Add the DT binding documentation for Interrupt Aggregator driver. Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
67 lines
3.1 KiB
Plaintext
67 lines
3.1 KiB
Plaintext
Texas Instruments K3 Interrupt Aggregator
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=========================================
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The Interrupt Aggregator (INTA) provides a centralized machine
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which handles the termination of system events to that they can
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be coherently processed by the host(s) in the system. A maximum
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of 64 events can be mapped to a single interrupt.
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Interrupt Aggregator
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+-----------------------------------------+
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| Intmap VINT |
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| +--------------+ +------------+ |
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m ------>| | vint | bit | | 0 |.....|63| vint0 |
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. | +--------------+ +------------+ | +------+
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. | . . | | HOST |
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Globalevents ------>| . . |------>| IRQ |
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. | . . | | CTRL |
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. | . . | +------+
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n ------>| +--------------+ +------------+ |
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| | vint | bit | | 0 |.....|63| vintx |
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| +--------------+ +------------+ |
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+-----------------------------------------+
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Configuration of these Intmap registers that maps global events to vint is done
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by a system controller (like the Device Memory and Security Controller on K3
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AM654 SoC). Driver should request the system controller to get the range
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of global events and vints assigned to the requesting host. Management
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of these requested resources should be handled by driver and requests
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system controller to map specific global event to vint, bit pair.
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Communication between the host processor running an OS and the system
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controller happens through a protocol called TI System Control Interface
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(TISCI protocol). For more details refer:
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Documentation/devicetree/bindings/arm/keystone/ti,sci.txt
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TISCI Interrupt Aggregator Node:
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-------------------------------
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- compatible: Must be "ti,sci-inta".
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- reg: Should contain registers location and length.
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- interrupt-controller: Identifies the node as an interrupt controller
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- msi-controller: Identifies the node as an MSI controller.
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- interrupt-parent: phandle of irq parent.
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- ti,sci: Phandle to TI-SCI compatible System controller node.
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- ti,sci-dev-id: TISCI device ID of the Interrupt Aggregator.
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- ti,sci-rm-range-vint: Array of TISCI subtype ids representing vints(inta
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outputs) range within this INTA, assigned to the
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requesting host context.
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- ti,sci-rm-range-global-event: Array of TISCI subtype ids representing the
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global events range reaching this IA and are assigned
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to the requesting host context.
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Example:
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--------
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main_udmass_inta: interrupt-controller@33d00000 {
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compatible = "ti,sci-inta";
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reg = <0x0 0x33d00000 0x0 0x100000>;
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interrupt-controller;
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msi-controller;
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interrupt-parent = <&main_navss_intr>;
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ti,sci = <&dmsc>;
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ti,sci-dev-id = <179>;
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ti,sci-rm-range-vint = <0x0>;
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ti,sci-rm-range-global-event = <0x1>;
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};
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