[PATCH v2 06/10] dt-bindings: irqchip: Introduce TISCI Interrupt router bindings

Lokesh Vutla
2018-10-18T15:41:32Z

Add the DT binding documentation for Interrupt router driver.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
---
Changes since v1:
- Drop dependency on GIC
- Updated supported interrupt types.

.../interrupt-controller/ti,sci-intr.txt | 81 +++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 82 insertions(+)
create mode 100644 Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.txt

diff --git a/Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.txt b/Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.txt
new file mode 100644
index 000000000000..276bb4f0ad12
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.txt
@@ -0,0 +1,81 @@
+Texas Instruments K3 Interrupt Router
+=====================================
+
+The Interrupt Router (INTR) module provides a mechanism to mux M
+interrupt inputs to N interrupt outputs, where all M inputs are selectable
+to be driven per N output. There is one register per output (MUXCNTL_N) that
+controls the selection.
+
+
+ Interrupt Router
+ +----------------------+
+ | Inputs Outputs |
+ +-------+ | +------+ |
+ | GPIO |----------->| | irq0 | | Host IRQ
+ +-------+ | +------+ | controller
+ | . +-----+ | +-------+
+ +-------+ | . | 0 | |----->| IRQ |
+ | INTA |----------->| . +-----+ | +-------+
+ +-------+ | . . |
+ | +------+ . |
+ | | irqM | +-----+ |
+ | +------+ | N | |
+ | +-----+ |
+ +----------------------+
+
+Configuration of these MUXCNTL_N registers is done by a system controller
+(like the Device Memory and Security Controller on K3 AM654 SoC). System
+controller will keep track of the used and unused registers within the Router.
+Driver should request the system controller to get the range of GIC IRQs
+assigned to the requesting hosts. It is the drivers responsibility to keep
+track of Host IRQs.
+
+Communication between the host processor running an OS and the system
+controller happens through a protocol called TI System Control Interface
+(TISCI protocol). For more details refer:
+Documentation/devicetree/bindings/arm/keystone/ti,sci.txt
+
+TISCI Interrupt Router Node:
+----------------------------
+- compatible: Must be "ti,sci-intr".
+- interrupt-controller: Identifies the node as an interrupt controller
+- #interrupt-cells: Specifies the number of cells needed to encode an
+ interrupt source. The value should be 3.
+ First cell should contain the TISCI device ID of source
+ Second cell should contain the interrupt source offset
+ within the device
+ Third cell specifies the trigger type as defined
+ in interrupts.txt in this directory. Only level
+ sensitive trigger types are supported.
+- interrupt-parent: phandle of irq parent for TISCI intr.
+- ti,sci: Phandle to TI-SCI compatible System controller node.
+- ti,sci-dst-id: TISCI device ID of the destination IRQ controller.
+- ti,sci-rm-range-girq: TISCI subtype id representing the host irqs assigned
+ to this interrupt router.
+
+Example:
+--------
+The following example demonstrates both interrupt router node and the consumer
+node(main gpio) on the AM654 SoC:
+
+main_intr: interrupt-controller@1 {
+ compatible = "ti,sci-intr";
+ interrupt-controller;
+ interrupt-parent = <&gic>;
+ #interrupt-cells = <3>;
+ ti,sci = <&dmsc>;
+ ti,sci-dst-id = <56>;
+ ti,sci-rm-range-girq = <0x1>;
+};
+
+main_gpio0: main_gpio0@600000 {
+ ...
+ interrupt-parent = <&main_intr>;
+ interrupts = <57 256 IRQ_TYPE_EDGE_RISING>,
+ <57 257 IRQ_TYPE_EDGE_RISING>,
+ <57 258 IRQ_TYPE_EDGE_RISING>,
+ <57 259 IRQ_TYPE_EDGE_RISING>,
+ <57 260 IRQ_TYPE_EDGE_RISING>,
+ <57 261 IRQ_TYPE_EDGE_RISING>;
+ ...
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 06966772cad4..710cf728b9d0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14686,6 +14686,7 @@ F: Documentation/devicetree/bindings/reset/ti,sci-reset.txt
F: Documentation/devicetree/bindings/clock/ti,sci-clk.txt
F: drivers/clk/keystone/sci-clk.c
F: drivers/reset/reset-ti-sci.c
+F: Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.txt

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