linux-kernel - [PATCH v2 04/10] dt-bindings: timer: Add EcoNet EN751221 "HPT" CPU Timer

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Message-Id: <20250325134349.2476458-5-cjd@cjdns.fr>
Date: Tue, 25 Mar 2025 13:43:43 +0000
From: Caleb James DeLisle <cjd@...ns.fr>
To: linux-mips@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	benjamin.larsson@...exis.eu,
	Caleb James DeLisle <cjd@...ns.fr>
Subject: [PATCH v2 04/10] dt-bindings: timer: Add EcoNet EN751221 "HPT" CPU Timer

Add device tree bindings for the so-called high-precision timer (HPT)
in the EcoNet EN751221 SoC.

Signed-off-by: Caleb James DeLisle <cjd@...ns.fr>
---
HPT is a name commonly used in vendor and 3rd party out-of-tree sources.
---
 .../bindings/timer/econet,en751221-timer.yaml | 78 +++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/timer/econet,en751221-timer.yaml

diff --git a/Documentation/devicetree/bindings/timer/econet,en751221-timer.yaml b/Documentation/devicetree/bindings/timer/econet,en751221-timer.yaml
new file mode 100644
index 000000000000..a897af322135
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/econet,en751221-timer.yaml
@@ -0,0 +1,78 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/timer/econet,en751221-timer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: EcoNet EN751221 High Precision Timer (HPT)
+
+maintainers:
+  - Caleb James DeLisle <cjd@...ns.fr>
+
+description:
+  The EcoNet High Precision Timer (HPT) is a timer peripheral found in various
+  EcoNet SoCs, including the EN751221 and EN751627 families. It provides per-VPE
+  count/compare registers and a per-CPU control register, with a single interrupt
+  line using a percpu-devid interrupt mechanism.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - const: econet,en751221-timer
+      - items:
+          - const: econet,en751627-timer
+          - const: econet,en751221-timer
+
+  reg: true
+
+  interrupts:
+    maxItems: 1
+    description: A percpu-devid timer interrupt shared across CPUs.
+
+  clocks:
+    maxItems: 1
+
+if:
+  properties:
+    compatible:
+      contains:
+        const: econet,en751627-timer
+then:
+  properties:
+    reg:
+      items:
+        - description: Base address for VPE timers 0 and 1
+        - description: Base address for VPE timers 2 and 3
+else:
+  properties:
+    reg:
+      items:
+        - description: Base address for VPE timers 0 and 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    timer@...f0400 {
+        compatible = "econet,en751627-timer", "econet,en751221-timer";
+        reg = <0x1fbf0400 0x100>, <0x1fbe0000 0x100>;
+        interrupt-parent = <&intc>;
+        interrupts = <30>;
+        clocks = <&hpt_clock>;
+    };
+  - |
+    timer@...f0400 {
+        compatible = "econet,en751221-timer";
+        reg = <0x1fbe0400 0x100>;
+        interrupt-parent = <&intc>;
+        interrupts = <30>;
+        clocks = <&hpt_clock>;
+    };
+...
-- 
2.39.5