linux-kernel - [v4 06/11] dt-binding: pmu: Add RISC-V PMU DT bindings

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Date:   Mon, 25 Oct 2021 12:53:45 -0700
From:   Atish Patra <atish.patra@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Atish Patra <atish.patra@....com>, Anup Patel <anup.patel@....com>,
        David Abdurachmanov <david.abdurachmanov@...ive.com>,
        devicetree@...r.kernel.org, Greentime Hu <greentime.hu@...ive.com>,
        Guo Ren <guoren@...ux.alibaba.com>,
        Heinrich Schuchardt <xypron.glpk@....de>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        linux-perf-users@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Nick Kossifidis <mick@....forth.gr>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>,
        Vincent Chen <vincent.chen@...ive.com>
Subject: [v4 06/11] dt-binding: pmu: Add RISC-V PMU DT bindings

This patch adds the DT bindings for RISC-V PMU driver. It also defines
the interrupt related properties to allow counter overflow interrupt.

Signed-off-by: Atish Patra <atish.patra@....com>
---
 .../devicetree/bindings/perf/riscv,pmu.yaml   | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/perf/riscv,pmu.yaml

diff --git a/Documentation/devicetree/bindings/perf/riscv,pmu.yaml b/Documentation/devicetree/bindings/perf/riscv,pmu.yaml
new file mode 100644
index 000000000000..497caad63f16
--- /dev/null
+++ b/Documentation/devicetree/bindings/perf/riscv,pmu.yaml
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pmu/riscv,pmu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: RISC-V PMU
+
+maintainers:
+  - Atish Patra <atish.patra@....com>
+
+description:
+  The "Sscofpmf" extension allows the RISC-V PMU counters to overflow and
+  generate a local interrupt so that event sampling can be done from user-space.
+  The above said ISA extension is an optional extension to maintain backward
+  compatibility and will be included in privilege specification v1.12 . That's
+  why the interrupt property is marked as optional. The platforms with sscofpmf
+  extension should add this property to enable event sampling.
+  The device tree node with the compatible string is mandatory for any platform
+  that wants to use pmu counter start/stop methods using SBI PMU extension.
+
+properties:
+  compatible:
+    enum:
+      - riscv,pmu
+
+    description:
+      Should be "riscv,pmu".
+
+  interrupts-extended:
+    minItems: 1
+    maxItems: 4095
+
+additionalProperties: false
+
+required:
+  - None
+optional:
+  - compatible
+  - interrupts-extended
+
+examples:
+  - |
+    pmu {
+      compatible = "riscv,pmu";
+      interrupts-extended = <&cpu0intc 13>,
+                            <&cpu1intc 13>,
+                            <&cpu2intc 13>,
+                            <&cpu3intc 13>;
+    };
+...
-- 
2.31.1