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authorThierry Reding <treding@nvidia.com>2016-04-12 17:07:36 +0200
committerRob Herring <robh@kernel.org>2016-04-19 17:25:19 -0500
commita8ca1b28acf543143bb96f62eb1423164accaa53 (patch)
tree140c40b7650883f06b97e09ead90661718e0ec07 /Documentation/devicetree/bindings/interrupt-controller/nvidia,tegra20-ictlr.txt
parentf43521e9521133c169fe4b9255fb0917baf5ec84 (diff)
dt-bindings: tegra: Rename some bindings for consistency
Device tree binding for NVIDIA Tegra have traditionally carried the "nvidia," vendor prefix in the filename. A couple of odd ones don't, so fix them up for consistency. Also rename existing bindings to reflect the first compatible value that they document. This wasn't done consistently either. Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Rob Herring <robh@kernel.org>
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+NVIDIA Legacy Interrupt Controller
+
+All Tegra SoCs contain a legacy interrupt controller that routes
+interrupts to the GIC, and also serves as a wakeup source. It is also
+referred to as "ictlr", hence the name of the binding.
+
+The HW block exposes a number of interrupt controllers, each
+implementing a set of 32 interrupts.
+
+Required properties:
+
+- compatible : should be: "nvidia,tegra<chip>-ictlr". The LIC on
+ subsequent SoCs remained backwards-compatible with Tegra30, so on
+ Tegra generations later than Tegra30 the compatible value should
+ include "nvidia,tegra30-ictlr".
+- reg : Specifies base physical address and size of the registers.
+ Each controller must be described separately (Tegra20 has 4 of them,
+ whereas Tegra30 and later have 5"
+- interrupt-controller : Identifies the node as an interrupt controller.
+- #interrupt-cells : Specifies the number of cells needed to encode an
+ interrupt source. The value must be 3.
+- interrupt-parent : a phandle to the GIC these interrupts are routed
+ to.
+
+Notes:
+
+- Because this HW ultimately routes interrupts to the GIC, the
+ interrupt specifier must be that of the GIC.
+- Only SPIs can use the ictlr as an interrupt parent. SGIs and PPIs
+ are explicitly forbidden.
+
+Example:
+
+ ictlr: interrupt-controller@60004000 {
+ compatible = "nvidia,tegra20-ictlr", "nvidia,tegra-ictlr";
+ reg = <0x60004000 64>,
+ <0x60004100 64>,
+ <0x60004200 64>,
+ <0x60004300 64>;
+ interrupt-controller;
+ #interrupt-cells = <3>;
+ interrupt-parent = <&intc>;
+ };