linux-kernel - [PATCH 14/18] dt-bindings: interrupt-controller: Add DT bindings for apple-aic

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Message-Id: <20210204203951.52105-15-marcan@marcan.st>
Date:   Fri,  5 Feb 2021 05:39:47 +0900
From:   Hector Martin <marcan@...can.st>
To:     Hector Martin <marcan@...can.st>, soc@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org,
        Marc Zyngier <maz@...nel.org>, robh+dt@...nel.org,
        Arnd Bergmann <arnd@...nel.org>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Olof Johansson <olof@...om.net>
Subject: [PATCH 14/18] dt-bindings: interrupt-controller: Add DT bindings for apple-aic

AIC is the Apple Interrupt Controller found on Apple ARM SoCs, such as
the M1.

Signed-off-by: Hector Martin <marcan@...can.st>
---
 .../interrupt-controller/AAPL,aic.yaml        | 88 +++++++++++++++++++
 MAINTAINERS                                   |  2 +
 .../interrupt-controller/apple-aic.h          | 14 +++
 3 files changed, 104 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/AAPL,aic.yaml
 create mode 100644 include/dt-bindings/interrupt-controller/apple-aic.h

diff --git a/Documentation/devicetree/bindings/interrupt-controller/AAPL,aic.yaml b/Documentation/devicetree/bindings/interrupt-controller/AAPL,aic.yaml
new file mode 100644
index 000000000000..7e119614275a
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/AAPL,aic.yaml
@@ -0,0 +1,88 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/AAPL,aic.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple Interrupt Controller
+
+maintainers:
+  - Hector Martin <marcan@...can.st>
+
+description: |
+  The Apple Interrupt Controller is a simple interrupt controller present on
+  Apple ARM SoC platforms, including various iPhone and iPad devices and the
+  "Apple Silicon" M1 Macs.
+
+  It provides the following features:
+
+  - Level-triggered hardware IRQs wired to SoC blocks
+    - Single mask bit per IRQ
+    - Per-IRQ affinity setting
+    - Automatic masking on event delivery (auto-ack)
+    - Software triggering (ORed with hw line)
+  - 2 per-CPU IPIs (meant as "self" and "other", but they are interchangeable
+    if not symmetric)
+  - Automatic prioritization (single event/ack register per CPU, lower IRQs =
+    higher priority)
+  - Automatic masking on ack
+  - Default "this CPU" register view and explicit per-CPU views
+
+allOf:
+  - $ref: /schemas/interrupt-controller.yaml#
+
+properties:
+  compatible:
+    contains:
+      enum:
+        - AAPL,aic
+        - AAPL,m1-aic
+
+  interrupt-controller: true
+
+  '#interrupt-cells':
+    const: 3
+    description: |
+      The 1st cell contains the interrupt type:
+        - 0: Hardware IRQ
+        - 1: FIQ
+        - 2: IPI
+
+      The 2nd cell contains the interrupt number.
+        - HW IRQs: interrupt number
+        - FIQs:
+          - 0: physical timer
+          - 1: virtual timer
+        - IPIs:
+          - 0: normal/"other" IPI (used interanlly for virtual IPIs)
+          - 1: self IPI (normally unused)
+
+      The 3rd cell contains the interrupt flags. This is normally
+      IRQ_TYPE_LEVEL_HIGH (4).
+
+  reg:
+    description: |
+      Specifies base physical address and size of the AIC registers.
+    maxItems: 1
+
+required:
+  - compatible
+  - '#interrupt-cells'
+  - interrupt-controller
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        aic: interrupt-controller@...100000 {
+            compatible = "AAPL,m1-aic", "AAPL,aic";
+            #interrupt-cells = <3>;
+            interrupt-controller;
+            reg = <0x2 0x3b100000 0x0 0x8000>;
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 91a7b33834ac..f3d4661731c8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1634,6 +1634,8 @@ B:	https://github.com/AsahiLinux/linux/issues
 C:	irc://chat.freenode.net/asahi-dev
 T:	git https://github.com/AsahiLinux/linux.git
 F:	Documentation/devicetree/bindings/arm/AAPL.yaml
+F:	Documentation/devicetree/bindings/interrupt-controller/AAPL,aic.yaml
+F:	include/dt-bindings/interrupt-controller/apple-aic.h
 
 ARM/ARTPEC MACHINE SUPPORT
 M:	Jesper Nilsson <jesper.nilsson@...s.com>
diff --git a/include/dt-bindings/interrupt-controller/apple-aic.h b/include/dt-bindings/interrupt-controller/apple-aic.h
new file mode 100644
index 000000000000..f54dc0cd6e9a
--- /dev/null
+++ b/include/dt-bindings/interrupt-controller/apple-aic.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */
+#ifndef _DT_BINDINGS_INTERRUPT_CONTROLLER_APPLE_AIC_H
+#define _DT_BINDINGS_INTERRUPT_CONTROLLER_APPLE_AIC_H
+
+#include <dt-bindings/interrupt-controller/irq.h>
+
+#define AIC_IRQ 0
+#define AIC_FIQ 1
+#define AIC_IPI 2
+
+#define AIC_TMR_PHYS 0
+#define AIC_TMR_VIRT 1
+
+#endif
-- 
2.30.0