linux-kernel - [PATCH v1 2/3] dt-bindings: counter: Add NXP System Timer Module Counter

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Message-ID: <20251208030413.3117660-3-daniel.lezcano@linaro.org>
Date: Mon,  8 Dec 2025 04:04:12 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: wbg@...nel.org,
	robh@...nel.org,
	conor+dt@...nel.org,
	krzk+dt@...nel.org
Cc: s32@....com,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org
Subject: [PATCH v1 2/3] dt-bindings: counter: Add NXP System Timer Module Counter

Add the System Timer Module description found on the NXP s32 platform
when it is used as a counter and the compatible for the s32g2 variant.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 .../bindings/counter/nxp,s32g2-stm-cnt.yaml   | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/counter/nxp,s32g2-stm-cnt.yaml

diff --git a/Documentation/devicetree/bindings/counter/nxp,s32g2-stm-cnt.yaml b/Documentation/devicetree/bindings/counter/nxp,s32g2-stm-cnt.yaml
new file mode 100644
index 000000000000..4d42996f5ad3
--- /dev/null
+++ b/Documentation/devicetree/bindings/counter/nxp,s32g2-stm-cnt.yaml
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/counter/nxp,s32g2-stm-cnt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP System Timer Module (STM)
+
+maintainers:
+  - Daniel Lezcano <daniel.lezcano@...nel.org>
+
+description:
+  The System Timer Module supports commonly required system and application
+  software timing functions. STM includes a 32-bit count-up timer and four
+  32-bit compare channels with a separate interrupt source for each channel.
+  The counter is driven by the STM module clock divided by an 8-bit prescale
+  value.
+
+properties:
+  compatible:
+    oneOf:
+      - const: nxp,s32g2-stm-cnt
+      - items:
+          - const: nxp,s32g3-stm-cnt
+          - const: nxp,s32g2-stm-cnt
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Counter clock
+      - description: Module clock
+      - description: Register clock
+
+  clock-names:
+    items:
+      - const: counter
+      - const: module
+      - const: register
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    timer@...1c000 {
+        compatible = "nxp,s32g2-stm-cnt";
+        reg = <0x4011c000 0x3000>;
+        interrupts = <GIC_SPI 24 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clks 0x3b>, <&clks 0x3c>, <&clks 0x3c>;
+        clock-names = "counter", "module", "register";
+    };
-- 
2.43.0