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Date:   Thu, 30 Mar 2023 18:43:49 -0700
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Subject: [RFC PATCH v2 5/6] dt-bindings: cpufreq: add bindings for virtual kvm cpufreq
From:   David Dai <davidai@google.com>
To:     "Rafael J. Wysocki" <rafael@kernel.org>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Marc Zyngier <maz@kernel.org>,
        Oliver Upton <oliver.upton@linux.dev>,
        James Morse <james.morse@arm.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Zenghui Yu <yuzenghui@huawei.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Lorenzo Pieralisi <lpieralisi@kernel.org>,
        Sudeep Holla <sudeep.holla@arm.com>,
        Ingo Molnar <mingo@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Juri Lelli <juri.lelli@redhat.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
        Daniel Bristot de Oliveira <bristot@redhat.com>,
        Valentin Schneider <vschneid@redhat.com>,
        David Dai <davidai@google.com>
Cc:     Saravana Kannan <saravanak@google.com>, kernel-team@android.com,
        linux-pm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        kvmarm@lists.linux.dev
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Precedence: bulk

Add devicetree bindings for a virtual kvm cpufreq driver.

Co-developed-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: David Dai <davidai@google.com>
---
 .../bindings/cpufreq/cpufreq-virtual-kvm.yaml | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-virtual-kvm.yaml

diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-virtual-kvm.yaml b/Documentation/devicetree/bindings/cpufreq/cpufreq-virtual-kvm.yaml
new file mode 100644
index 000000000000..31e64558a7f1
--- /dev/null
+++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-virtual-kvm.yaml
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/cpufreq/cpufreq-virtual-kvm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Virtual KVM CPUFreq
+
+maintainers:
+  - David Dai <davidai@google.com>
+
+description: |
+
+  KVM CPUFreq is a virtualized driver in guest kernels that sends utilization
+  of its vCPUs as a hint to the host. The host uses hint to schedule vCPU
+  threads and select CPU frequency. It enables accurate Per-Entity Load
+  Tracking for tasks running in the guest by querying host CPU frequency
+  unless a virtualized FIE exists(Like AMUs).
+
+properties:
+  compatible:
+    const: virtual,kvm-cpufreq
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    {
+      #address-cells = <2>;
+      #size-cells = <2>;
+
+      cpufreq {
+            compatible = "virtual,kvm-cpufreq";
+      };
+
+    };
-- 
2.40.0.348.gf938b09366-goog