[PATCH v2 1/2] dt-bindings/interrupt-controller: rzn1: Add RZ/N1 gpio irq mux binding

[Phil Edworthy <phil.edworthy@renesas.com>]

Add device binding documentation for the Renesas RZ/N1 GPIO interrupt
multiplexer.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
---
v2:
 - Use interrupt-map to allow the GPIO controller info to be specified
   as part of the irq.
 - Don't show status in binding examples.
 - Don't show the soc/board split in binding doc.
---
 .../interrupt-controller/renesas,rzn1-mux.txt | 92 +++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/renesas,rzn1-mux.txt

diff --git a/Documentation/devicetree/bindings/interrupt-controller/renesas,rzn1-mux.txt b/Documentation/devicetree/bindings/interrupt-controller/renesas,rzn1-mux.txt
new file mode 100644
index 000000000000..0b4ba27c00ef
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/renesas,rzn1-mux.txt
@@ -0,0 +1,92 @@
+* Renesas RZ/N1 GPIO Interrupt Multiplexer
+
+On Renesas RZ/N1 devices, there are several GPIO Controllers each with a number
+of interrupt outputs. All of the interrupts from the GPIO Controllers are passed
+to the GPIO Interrupt Multiplexer, which selects a sub-set of the interrupts to
+pass onto the system interrupt controller.
+
+A single node in the device tree is used to describe the GPIO IRQ Muxer.
+
+Required properties:
+- compatible: SoC-specific compatible string "renesas,<soc-specific>-gpioirqmux"
+  followed by "renesas,rzn1-gpioirqmux" as fallback. The SoC-specific compatible
+  strings must be one of:
+	"renesas,r9a06g032-gpioirqmux" for RZ/N1D
+	"renesas,r9a06g033-gpioirqmux" for RZ/N1S
+- interrupt-controller: Identifies the node as an interrupt controller.
+- #interrupt-cells: should be <1>. The meaning of the cells is the input
+   interrupt index, 0 to 95.
+- reg: Base address and size of GPIO IRQ Muxer registers.
+- interrupts: This is a list of interrupt specifiers. Each interrupt consists of
+   three numbers that represent:
+     - (a) the index of the GPIO Interrupt Multiplexer output interrupt (0..7)
+     - (b) the index of the GPIO Controller input interrupt (0..2)
+     - (c) the interrupt index of the GPIO Controller input interrupt (0..31).
+- interrupt-parent: A phandle for a local node that specifies an interrupt-map.
+   The interrupt-map node must specify #interrupt-cells = <3>, and an
+   interrupt-map property. The interrupt-map is used to translate the interrupt
+   specifier to the output interrupts. It is used in conjunction with an
+   interrupt-map-mask property to mask (b) and (c) from the interrupt specifier
+   so that essentially there is a direct map from (a) to the output interrupt.
+   Therefore (b) and (c) can be used to determine the interrupt source and
+   configure the hardware accordingly. For information on interrupts,
+   see Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+
+Example:
+
+	The following is an example for the RZ/N1D SoC.
+
+	gpioirqmux: gpioirqmux@51000480 {
+		compatible = "renesas,r9a06g032-gpioirqmux",
+				"renesas,rzn1-gpioirqmux";
+		reg = <0x51000480 0x20>;
+
+		interrupt-controller;
+		#interrupt-cells = <1>;
+		interrupt-parent = <&gpioirqmux_map>;
+		interrupts =
+			<0 1 17>,	/* gpio1a 17 */
+			<1 1 24>,	/* gpio1a 24 */
+			<2 1 26>;	/* gpio1a 26 */
+
+		gpioirqmux_map: gpioirqmux-map {
+			#interrupt-cells = <3>;
+			#address-cells = <0>;
+			interrupt-map-mask = <7 0 0>;
+			interrupt-map =
+				<0 0 0 &gic GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>,
+				<1 0 0 &gic GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>,
+				<2 0 0 &gic GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>,
+				<3 0 0 &gic GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>,
+				<4 0 0 &gic GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>,
+				<5 0 0 &gic GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>,
+				<6 0 0 &gic GIC_SPI 109 IRQ_TYPE_LEVEL_HIGH>,
+				<7 0 0 &gic GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
+		};
+	};
+
+	gpio1: gpio@5000c000 {
+		compatible = "snps,dw-apb-gpio";
+		reg = <0x5000c000 0x80>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		clock-names = "bus";
+		clocks = <&sysctrl R9A06G032_HCLK_GPIO1>;
+
+		gpio1a: gpio-controller@0 {
+			compatible = "snps,dw-apb-gpio-port";
+			bank-name = "gpio1a";
+			gpio-controller;
+			#gpio-cells = <2>;
+			snps,nr-gpios = <32>;
+			reg = <0>;
+
+			interrupt-controller;
+			interrupt-parent = <&gpioirqmux>;
+			interrupts =   < 0  1  2  3  4  5  6  7
+					 8  9 10 11 12 13 14 15
+					16 17 18 19 20 21 22 23
+					24 25 26 27 28 29 30 31 >;
+			#interrupt-cells = <2>;
+		};
+	};
-- 
2.17.1