NVIDIA Legacy Interrupt Controller
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All Tegra SoCs contain a legacy interrupt controller that routes
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interrupts to the GIC, and also serves as a wakeup source. It is also
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referred to as "ictlr", hence the name of the binding.
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The HW block exposes a number of interrupt controllers, each
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implementing a set of 32 interrupts.
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Required properties:
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- compatible : should be: "nvidia,tegra<chip>-ictlr". The LIC on
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subsequent SoCs remained backwards-compatible with Tegra30, so on
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Tegra generations later than Tegra30 the compatible value should
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include "nvidia,tegra30-ictlr".
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- reg : Specifies base physical address and size of the registers.
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Each controller must be described separately (Tegra20 has 4 of them,
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whereas Tegra30 and later have 5).
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- interrupt-controller : Identifies the node as an interrupt controller.
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- #interrupt-cells : Specifies the number of cells needed to encode an
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interrupt source. The value must be 3.
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Notes:
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- Because this HW ultimately routes interrupts to the GIC, the
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interrupt specifier must be that of the GIC.
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- Only SPIs can use the ictlr as an interrupt parent. SGIs and PPIs
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are explicitly forbidden.
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Example:
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ictlr: interrupt-controller@60004000 {
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compatible = "nvidia,tegra20-ictlr", "nvidia,tegra-ictlr";
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reg = <0x60004000 64>,
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<0x60004100 64>,
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<0x60004200 64>,
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<0x60004300 64>;
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interrupt-controller;
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#interrupt-cells = <3>;
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interrupt-parent = <&intc>;
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};
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