[PATCH 3/6] dt-bindings: soc: renesas: Add the Renesas RZ/N1 GPIO Interrupt Multiplexer

[Herve Codina <herve.codina@bootlin.com>]

On the Renesas RZ/N1 SoC, GPIOs can generate interruptions. Those
interruption lines are multiplexed by the GPIO Interrupt Multiplexer in
order to map 32 * 3 GPIO interrupt lines to 8 GIC interrupt lines.

The GPIO interrupt multiplexer IP does nothing but select 8 GPIO
IRQ lines out of the 96 available to wire them to the GIC input lines.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
 .../soc/renesas/renesas,rzn1-gpioirqmux.yaml  | 99 +++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/renesas/renesas,rzn1-gpioirqmux.yaml

diff --git a/Documentation/devicetree/bindings/soc/renesas/renesas,rzn1-gpioirqmux.yaml b/Documentation/devicetree/bindings/soc/renesas/renesas,rzn1-gpioirqmux.yaml
new file mode 100644
index 000000000000..d2b380f15be7
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/renesas/renesas,rzn1-gpioirqmux.yaml
@@ -0,0 +1,99 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/renesas/renesas,rzn1-gpioirqmux.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas RZ/N1 SoCs GPIO Interrupt Multiplexer
+
+description: |
+   The Renesas RZ/N1 GPIO Interrupt Multiplexer multiplexes GPIO interrupt
+   lines to the interrupt controller available in the SoC.
+
+   It selects up to 8 of the 96 GPIO interrupt lines available and connect them
+   to 8 output interrupt lines.
+
+maintainers:
+  - Herve Codina <herve.codina@bootlin.com>
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - renesas,r9a06g032-gpioirqmux
+      - const: renesas,rzn1-gpioirqmux
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    minItems: 8
+    maxItems: 8
+    description:
+      Output interrupt lines
+
+  "#address-cells":
+    const: 0
+
+  "#interrupt-cells":
+    const: 1
+
+  interrupt-map-mask:
+    items:
+      - const: 0x7f
+
+  interrupt-map:
+    description:
+      Specifies the mapping from external GPIO interrupt lines to the output
+      interrupts.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - "#address-cells"
+  - "#interrupt-cells"
+  - interrupt-map-mask
+  - interrupt-map
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    gic: interrupt-controller {
+        interrupt-controller;
+        #interrupt-cells = <3>;
+    };
+
+    interrupt-controller@51000480 {
+        compatible = "renesas,r9a06g032-gpioirqmux", "renesas,rzn1-gpioirqmux";
+        reg = <0x51000480 0x20>;
+        interrupts = <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 109 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
+        #address-cells = <0>;
+        #interrupt-cells = <1>;
+        interrupt-map-mask = <0x7f>;
+        /*
+         * The child interrupt number is computed using the following formula:
+         *    gpio_bank * 32 + gpio_number
+         *
+         * with:
+         *    - gpio_bank: The GPIO bank number
+         *          - 0 for GPIO0A,
+         *          - 1 for GPIO1A,
+         *          - 2 for GPIO2A
+         *    - gpio_number: Number of the gpio in the bank (0..31)
+         */
+        interrupt-map =
+            <32 &gic GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>, /* GPIO1A.0 */
+            <89 &gic GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>, /* GPIO2A.25 */
+            <9 &gic GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>; /* GPIO0A.9 */
+    };
-- 
2.50.1