linux-kernel - [PATCH v5 1/4] dt-bindings: interconnect: qcom,msm8998-cpu-bwmon: add BWMON device

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Message-Id: <20220629075250.17610-2-krzysztof.kozlowski@linaro.org>
Date:   Wed, 29 Jun 2022 09:52:47 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Georgi Djakov <djakov@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Rob Herring <robh@...nel.org>
Subject: [PATCH v5 1/4] dt-bindings: interconnect: qcom,msm8998-cpu-bwmon: add BWMON device

Add bindings for the Qualcomm Bandwidth Monitor device providing
performance data on interconnects.  The bindings describe only BWMON CPU
(version 4), e.g. the instance which appeared for the first on Qualcomm
MSM8998 SoC and is also used on SDM845.  This BWMON device sits between
CPU and Last Level Cache Controller.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Reviewed-by: Rob Herring <robh@...nel.org>
Acked-by: Georgi Djakov <djakov@...nel.org>
---
 .../interconnect/qcom,msm8998-cpu-bwmon.yaml  | 80 +++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interconnect/qcom,msm8998-cpu-bwmon.yaml

diff --git a/Documentation/devicetree/bindings/interconnect/qcom,msm8998-cpu-bwmon.yaml b/Documentation/devicetree/bindings/interconnect/qcom,msm8998-cpu-bwmon.yaml
new file mode 100644
index 000000000000..b6ced53b92f7
--- /dev/null
+++ b/Documentation/devicetree/bindings/interconnect/qcom,msm8998-cpu-bwmon.yaml
@@ -0,0 +1,80 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interconnect/qcom,msm8998-cpu-bwmon.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Interconnect Bandwidth Monitor
+
+maintainers:
+  - Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
+
+description:
+  Bandwidth Monitor measures current throughput on buses between various NoC
+  fabrics and provides information when it crosses configured thresholds.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - qcom,sdm845-cpu-bwmon
+          - const: qcom,msm8998-cpu-bwmon
+      - const: qcom,msm8998-cpu-bwmon       # BWMON v4
+
+  interconnects:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  operating-points-v2: true
+  opp-table: true
+
+  reg:
+    # Currently described BWMON v4 and v5 use one register address space.
+    # BWMON v2 uses two register spaces - not yet described.
+    maxItems: 1
+
+required:
+  - compatible
+  - interconnects
+  - interrupts
+  - operating-points-v2
+  - opp-table
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interconnect/qcom,sdm845.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    pmu@...6400 {
+        compatible = "qcom,sdm845-cpu-bwmon", "qcom,msm8998-cpu-bwmon";
+        reg = <0x01436400 0x600>;
+        interrupts = <GIC_SPI 581 IRQ_TYPE_LEVEL_HIGH>;
+        interconnects = <&gladiator_noc MASTER_APPSS_PROC 3 &mem_noc SLAVE_LLCC 3>;
+
+        operating-points-v2 = <&cpu_bwmon_opp_table>;
+
+        cpu_bwmon_opp_table: opp-table {
+            compatible = "operating-points-v2";
+            opp-0 {
+                opp-peak-kBps = <4800000>;
+            };
+            opp-1 {
+                opp-peak-kBps = <9216000>;
+            };
+            opp-2 {
+                opp-peak-kBps = <15052800>;
+            };
+            opp-3 {
+                opp-peak-kBps = <20889600>;
+            };
+            opp-4 {
+                opp-peak-kBps = <25497600>;
+            };
+        };
+    };
-- 
2.34.1