linux-kernel - [PATCH 3/6] dt-bindings: perf: Add devicetree binding for custom PPMU

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Message-ID: <20250708103208.79444-4-vivek.2311@samsung.com>
Date: Tue,  8 Jul 2025 16:02:05 +0530
From: Vivek Yadav <vivek.2311@...sung.com>
To: pankaj.dubey@...sung.com, ravi.patel@...sung.com, shradha.t@...sung.com,
	mturquette@...libre.com, sboyd@...nel.org, robh@...nel.org, krzk@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, will@...nel.org,
	mark.rutland@....com, s.nawrocki@...sung.com, cw00.choi@...sung.com,
	alim.akhtar@...sung.com, linux-fsd@...la.com
Cc: linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-perf-users@...r.kernel.org, linux-samsung-soc@...r.kernel.org, Vivek
	Yadav <vivek.2311@...sung.com>
Subject: [PATCH 3/6] dt-bindings: perf: Add devicetree binding for custom
 PPMU

Add the dt-binding documentation for the Samsung specific
Platform Performance Monitoring Unit (PPMU) driver which provides
performance statistics for AXI bus masters such as MFC.

Signed-off-by: Ravi Patel <ravi.patel@...sung.com>
Signed-off-by: Vivek Yadav <vivek.2311@...sung.com>
---
 .../bindings/perf/samsung,ppmu-v2.yaml        | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/perf/samsung,ppmu-v2.yaml

diff --git a/Documentation/devicetree/bindings/perf/samsung,ppmu-v2.yaml b/Documentation/devicetree/bindings/perf/samsung,ppmu-v2.yaml
new file mode 100644
index 000000000000..d137d06b7034
--- /dev/null
+++ b/Documentation/devicetree/bindings/perf/samsung,ppmu-v2.yaml
@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/perf/samsung,ppmu-v2.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung PPMU (Platform Performance Monitoring Unit)
+
+maintainers:
+  - Vivek Yadav <vivek.2311@...sung.com>
+  - Ravi Patel <ravi.patel@...sung.com>
+
+description:
+  PPMU (Platform Performance Monitoring Unit) provides performance statistics
+  such as bandwidth, read and write request, transactions count for AXI masters
+  like MFC.
+
+properties:
+  compatible:
+    const: samsung,ppmu-v2
+
+  reg:
+    maxItems: 1
+    description: Memory-mapped register address
+
+  clocks:
+    items:
+      - description: AXI bus clock
+      - description: Peripheral clock
+
+  clock-names:
+    items:
+      - const: aclk
+      - const: pclk
+
+  interrupts:
+    items:
+      - description: Overflow interrupt for Counters
+      - description: Conditional Interrupt Generation (CIG)
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/fsd-clk.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    ppmu@...40000 {
+        compatible = "samsung,ppmu-v2";
+        reg = <0x12840000 0x1000>;
+        interrupts = <GIC_SPI 133 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 134 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clock_mfc MFC_PPMU_MFCD0_IPCLKPORT_ACLK>,
+                 <&clock_mfc MFC_PPMU_MFCD0_IPCLKPORT_PCLK>;
+        clock-names = "aclk", "pclk";
+     };
-- 
2.49.0