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Date:   Sun,  3 Jan 2021 04:30:52 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     Ondrej Jirman <megous@...ous.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com, Samuel Holland <samuel@...lland.org>
Subject: [PATCH v3 01/10] dt-bindings: irq: sun6i-r: Split the binding from sun7i-nmi

The R_INTC in the A31 and newer sun8i/sun50i SoCs has additional
functionality compared to the sun7i/sun9i NMI controller. Among other
things, it multiplexes up to 128 interrupts corresponding to (and in
parallel to) the first 128 GIC SPIs. This means the NMI is no longer the
lowest-numbered interrupt, since it is SPI 32 or 96 (depending on SoC).

To allow access to all multiplexed IRQs, the R_INTC requires a new
binding where the interrupt number matches the GIC interrupt number.
For simplicity, copy the three-cell GIC binding; this disambiguates
interrupt 0 in the old binding (the NMI) from interrupt 0 in the new
binding (SPI 0) by the number of cells.

Signed-off-by: Samuel Holland <samuel@...lland.org>
---
 .../allwinner,sun6i-a31-r-intc.yaml           | 64 +++++++++++++++++++
 .../allwinner,sun7i-a20-sc-nmi.yaml           | 10 ---
 2 files changed, 64 insertions(+), 10 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/allwinner,sun6i-a31-r-intc.yaml

diff --git a/Documentation/devicetree/bindings/interrupt-controller/allwinner,sun6i-a31-r-intc.yaml b/Documentation/devicetree/bindings/interrupt-controller/allwinner,sun6i-a31-r-intc.yaml
new file mode 100644
index 000000000000..18805b6555c2
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/allwinner,sun6i-a31-r-intc.yaml
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/allwinner,sun6i-a31-r-intc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner A31 NMI/Wakeup Interrupt Controller Device Tree Bindings
+
+maintainers:
+  - Chen-Yu Tsai <wens@...e.org>
+  - Maxime Ripard <mripard@...nel.org>
+
+allOf:
+  - $ref: /schemas/interrupt-controller.yaml#
+
+properties:
+  "#interrupt-cells":
+    const: 3
+    description:
+      The first cell is GIC_SPI (0), the second cell is the IRQ number, and
+      the third cell is the trigger type as defined in interrupt.txt in this
+      directory.
+
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - allwinner,sun8i-a83t-r-intc
+              - allwinner,sun50i-a64-r-intc
+              - allwinner,sun50i-h6-r-intc
+          - const: allwinner,sun6i-a31-r-intc
+      - const: allwinner,sun6i-a31-r-intc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-controller: true
+
+required:
+  - "#interrupt-cells"
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-controller
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    r_intc: interrupt-controller@...0c00 {
+            compatible = "allwinner,sun50i-a64-r-intc",
+                         "allwinner,sun6i-a31-r-intc";
+            interrupt-controller;
+            #interrupt-cells = <3>;
+            reg = <0x01f00c00 0x400>;
+            interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
+    };
+
+...
diff --git a/Documentation/devicetree/bindings/interrupt-controller/allwinner,sun7i-a20-sc-nmi.yaml b/Documentation/devicetree/bindings/interrupt-controller/allwinner,sun7i-a20-sc-nmi.yaml
index 8acca0ae3129..f34ecc8c7093 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/allwinner,sun7i-a20-sc-nmi.yaml
+++ b/Documentation/devicetree/bindings/interrupt-controller/allwinner,sun7i-a20-sc-nmi.yaml
@@ -22,23 +22,13 @@ properties:
 
   compatible:
     oneOf:
-      - const: allwinner,sun6i-a31-r-intc
       - const: allwinner,sun6i-a31-sc-nmi
         deprecated: true
       - const: allwinner,sun7i-a20-sc-nmi
-      - items:
-          - const: allwinner,sun8i-a83t-r-intc
-          - const: allwinner,sun6i-a31-r-intc
       - const: allwinner,sun9i-a80-nmi
-      - items:
-          - const: allwinner,sun50i-a64-r-intc
-          - const: allwinner,sun6i-a31-r-intc
       - items:
           - const: allwinner,sun50i-a100-nmi
           - const: allwinner,sun9i-a80-nmi
-      - items:
-          - const: allwinner,sun50i-h6-r-intc
-          - const: allwinner,sun6i-a31-r-intc
 
   reg:
     maxItems: 1
-- 
2.26.2

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