linux-kernel - [RFC PATCH v3 05/37] dt-bindings: Add binding for kalray,coolidge-apic-mailbox

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Message-ID: <20240722094226.21602-6-ysionneau@kalrayinc.com>
Date: Mon, 22 Jul 2024 11:41:16 +0200
From: ysionneau@...rayinc.com
To: linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>, Rob
 Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor
 Dooley <conor+dt@...nel.org>, Jonathan Borne <jborne@...rayinc.com>, Julian
 Vetter <jvetter@...rayinc.com>, Yann Sionneau <ysionneau@...rayinc.com>
Cc: Jules Maselbas <jmaselbas@...v.net>, devicetree@...r.kernel.org
Subject: [RFC PATCH v3 05/37] dt-bindings: Add binding for
 kalray,coolidge-apic-mailbox

From: Yann Sionneau <ysionneau@...rayinc.com>

Add binding for Kalray Coolidge APIC Mailbox interrupt-controller.

Co-developed-by: Jules Maselbas <jmaselbas@...v.net>
Signed-off-by: Jules Maselbas <jmaselbas@...v.net>
Signed-off-by: Yann Sionneau <ysionneau@...rayinc.com>
---

Notes:

V2 -> V3: Fixed bindings to adhere to dt-schema
---
 .../kalray,coolidge-apic-mailbox.yaml         | 90 +++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/kalray,coolidge-apic-mailbox.yaml

diff --git a/Documentation/devicetree/bindings/interrupt-controller/kalray,coolidge-apic-mailbox.yaml b/Documentation/devicetree/bindings/interrupt-controller/kalray,coolidge-apic-mailbox.yaml
new file mode 100644
index 0000000000000..334b816b80583
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/kalray,coolidge-apic-mailbox.yaml
@@ -0,0 +1,90 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/kalray,coolidge-apic-mailbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Kalray Coolidge APIC-Mailbox
+
+maintainers:
+  - Jonathan Borne <jborne@...rayinc.com>
+  - Julian Vetter <jvetter@...rayinc.com>
+  - Yann Sionneau <ysionneau@...rayinc.com>
+
+description: |
+  Each cluster in the Coolidge SoC includes an Advanced Programmable Interrupt
+  Controller (APIC) which is split in two part:
+    - a Generic Interrupt Controller (referred as APIC-GIC)
+    - a Mailbox Controller           (referred as APIC-Mailbox)
+  The APIC-Mailbox contains 128 mailboxes of 8 bytes (size of a word),
+  this hardware block is basically a 1 KB of smart memory space.
+  Each mailbox can be independently configured with a trigger condition
+  and an input mode function.
+
+  Input mode are:
+   - write
+   - bitwise OR
+   - add
+
+  Interrupts are generated on a write when the mailbox content value
+  match the configured trigger condition.
+  Available conditions are:
+   - doorbell: always raise interruption on write
+   - match: when the mailbox's value equal the configured trigger value
+   - barrier: same as match but the mailbox's value is cleared on trigger
+   - threshold: when the mailbox's value is greater than, or equal to, the
+     configured trigger value
+
+  Since this hardware block generates IRQs based on writes to some memory
+  locations, it is both an interrupt controller and an MSI controller.
+
+properties:
+  compatible:
+    const: kalray,coolidge-apic-mailbox
+
+  reg:
+    maxItems: 1
+
+  "#interrupt-cells":
+    const: 0
+    description:
+      The IRQ number.
+
+  "#address-cells":
+    const: 0
+
+  interrupt-controller: true
+
+  interrupts:
+    maxItems: 128
+    minItems: 1
+    description: |
+     Specifies the interrupt line(s) in the interrupt-parent controller node;
+     valid values depend on the type of parent interrupt controller
+
+  msi-controller: true
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - "#interrupt-cells"
+  - "#address-cells"
+  - interrupt-controller
+  - interrupts
+  - msi-controller
+
+examples:
+  - |
+    apic_mailbox: interrupt-controller@...000 {
+        compatible = "kalray,coolidge-apic-mailbox";
+        reg = <0 0xa00000 0 0x0f200>;
+        #interrupt-cells = <0>;
+        interrupt-controller;
+        interrupt-parent = <&apic_gic>;
+        interrupts = <0>, <1>, <2>, <3>, <4>, <5>, <6>, <7>, <8>, <9>;
+        msi-controller;
+    };
+
+...
-- 
2.45.2