Message-Id: <20240522153835.22712-2-kanakshilledar111@protonmail.com>
Date: Wed, 22 May 2024 21:08:36 +0530
From: Kanak Shilledar <kanakshilledar@...il.com>
To: 
Cc: Kanak Shilledar <kanakshilledar111@...tonmail.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Samuel Holland <samuel.holland@...ive.com>,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: [PATCH v3 1/2] dt-bindings: interrupt-controller: riscv,cpu-intc: convert to dtschema

Convert the RISC-V Hart-Level Interrupt Controller (HLIC) to newer
DT schema, Created DT schema based on the .txt file which had
`compatible`, `#interrupt-cells` and `interrupt-controller` as
required properties.
Changes made with respect to original file:
- Changed the example to just use interrupt-controller instead of
using the whole cpu block
- Changed the example compatible string.

Signed-off-by: Kanak Shilledar <kanakshilledar111@...tonmail.com>
---
Changes in v3:
- Remove reference to `interrupt-controller` in `riscv/cpus.yaml`.
---
Changes in v2:
- Update the maintainers list.
- Add reference to `interrupt-controller` in `riscv/cpus.yaml`.
- Update compatible property with the reference in `cpus.yaml`.
- Include description for '#interrupt-cells' property.
- Change '#interrupt-cells' property to have `const: 1` as per the
text binding.
- Fixed the warning thrown by `/renesas/r9a07g043f01-smarc.dtb`.
---
 .../interrupt-controller/riscv,cpu-intc.txt   | 52 -------------
 .../interrupt-controller/riscv,cpu-intc.yaml  | 73 +++++++++++++++++++
 2 files changed, 73 insertions(+), 52 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.txt
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.yaml

diff --git a/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.txt b/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.txt
deleted file mode 100644
index 265b223cd978..000000000000
--- a/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.txt
+++ /dev/null
@@ -1,52 +0,0 @@
-RISC-V Hart-Level Interrupt Controller (HLIC)
----------------------------------------------
-
-RISC-V cores include Control Status Registers (CSRs) which are local to each
-CPU core (HART in RISC-V terminology) and can be read or written by software.
-Some of these CSRs are used to control local interrupts connected to the core.
-Every interrupt is ultimately routed through a hart's HLIC before it
-interrupts that hart.
-
-The RISC-V supervisor ISA manual specifies three interrupt sources that are
-attached to every HLIC: software interrupts, the timer interrupt, and external
-interrupts.  Software interrupts are used to send IPIs between cores.  The
-timer interrupt comes from an architecturally mandated real-time timer that is
-controlled via Supervisor Binary Interface (SBI) calls and CSR reads.  External
-interrupts connect all other device interrupts to the HLIC, which are routed
-via the platform-level interrupt controller (PLIC).
-
-All RISC-V systems that conform to the supervisor ISA specification are
-required to have a HLIC with these three interrupt sources present.  Since the
-interrupt map is defined by the ISA it's not listed in the HLIC's device tree
-entry, though external interrupt controllers (like the PLIC, for example) will
-need to define how their interrupts map to the relevant HLICs.  This means
-a PLIC interrupt property will typically list the HLICs for all present HARTs
-in the system.
-
-Required properties:
-- compatible : "riscv,cpu-intc"
-- #interrupt-cells : should be <1>.  The interrupt sources are defined by the
-  RISC-V supervisor ISA manual, with only the following three interrupts being
-  defined for supervisor mode:
-    - Source 1 is the supervisor software interrupt, which can be sent by an SBI
-      call and is reserved for use by software.
-    - Source 5 is the supervisor timer interrupt, which can be configured by
-      SBI calls and implements a one-shot timer.
-    - Source 9 is the supervisor external interrupt, which chains to all other
-      device interrupts.
-- interrupt-controller : Identifies the node as an interrupt controller
-
-Furthermore, this interrupt-controller MUST be embedded inside the cpu
-definition of the hart whose CSRs control these local interrupts.
-
-An example device tree entry for a HLIC is show below.
-
-	cpu1: cpu@1 {
-		compatible = "riscv";
-		...
-		cpu1-intc: interrupt-controller {
-			#interrupt-cells = <1>;
-			compatible = "sifive,fu540-c000-cpu-intc", "riscv,cpu-intc";
-			interrupt-controller;
-		};
-	};
diff --git a/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.yaml b/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.yaml
new file mode 100644
index 000000000000..c9c79e0870ff
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.yaml
@@ -0,0 +1,73 @@
+# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/riscv,cpu-intc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: RISC-V Hart-Level Interrupt Controller (HLIC)
+
+description:
+  RISC-V cores include Control Status Registers (CSRs) which are local to
+  each CPU core (HART in RISC-V terminology) and can be read or written by
+  software. Some of these CSRs are used to control local interrupts connected
+  to the core. Every interrupt is ultimately routed through a hart's HLIC
+  before it interrupts that hart.
+
+  The RISC-V supervisor ISA manual specifies three interrupt sources that are
+  attached to every HLIC namely software interrupts, the timer interrupt, and
+  external interrupts. Software interrupts are used to send IPIs between
+  cores.  The timer interrupt comes from an architecturally mandated real-
+  time timer that is controlled via Supervisor Binary Interface (SBI) calls
+  and CSR reads. External interrupts connect all other device interrupts to
+  the HLIC, which are routed via the platform-level interrupt controller
+  (PLIC).
+
+  All RISC-V systems that conform to the supervisor ISA specification are
+  required to have a HLIC with these three interrupt sources present.  Since
+  the interrupt map is defined by the ISA it's not listed in the HLIC's device
+  tree entry, though external interrupt controllers (like the PLIC, for
+  example) will need to define how their interrupts map to the relevant HLICs.
+  This means a PLIC interrupt property will typically list the HLICs for all
+  present HARTs in the system.
+
+maintainers:
+  - Palmer Dabbelt <palmer@...belt.com>
+  - Paul Walmsley <paul.walmsley@...ive.com>
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - const: andestech,cpu-intc
+          - const: riscv,cpu-intc
+      - const: riscv,cpu-intc
+
+  interrupt-controller: true
+
+  '#interrupt-cells':
+    const: 1
+    description: |
+      The interrupt sources are defined by the RISC-V supervisor ISA manual,
+      with only the following three interrupts being defined for
+      supervisor mode:
+        - Source 1 is the supervisor software interrupt, which can be sent by
+          an SBI call and is reserved for use by software.
+        - Source 5 is the supervisor timer interrupt, which can be configured
+          by SBI calls and implements a one-shot timer.
+        - Source 9 is the supervisor external interrupt, which chains to all
+          other device interrupts.
+
+required:
+  - compatible
+  - '#interrupt-cells'
+  - interrupt-controller
+
+additionalProperties: false
+
+examples:
+  - |
+    interrupt-controller {
+        #interrupt-cells = <1>;
+        compatible = "riscv,cpu-intc";
+        interrupt-controller;
+    };
-- 
2.34.1

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