[v3,1/4] dt-bindings: interconnect: qcom,sdm845-cpu-bwmon: add BWMON device

Commit Message

Krzysztof Kozlowski May 31, 2022, 10:51 a.m. UTC

Add bindings for the Qualcomm Bandwidth Monitor device providing
performance data on interconnects.  The bindings describe only BWMON
version 4, e.g. the instance on SDM845 between CPU and Last Level Cache
Controller.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Acked-by: Georgi Djakov <[e-mail]>
---
 .../interconnect/qcom,sdm845-cpu-bwmon.yaml   | 97 +++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interconnect/qcom,sdm845-cpu-bwmon.yaml

Patch

diff --git a/Documentation/devicetree/bindings/interconnect/qcom,sdm845-cpu-bwmon.yaml b/Documentation/devicetree/bindings/interconnect/qcom,sdm845-cpu-bwmon.yaml
new file mode 100644
index 000000000000..8c82e06ee432
--- /dev/null
+++ b/Documentation/devicetree/bindings/interconnect/qcom,sdm845-cpu-bwmon.yaml
@@ -0,0 +1,97 @@ 
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interconnect/qcom,sdm845-cpu-bwmon.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Interconnect Bandwidth Monitor
+
+maintainers:
+  - Krzysztof Kozlowski <[e-mail]>
+
+description:
+  Bandwidth Monitor measures current throughput on buses between various NoC
+  fabrics and provides information when it crosses configured thresholds.
+
+properties:
+  compatible:
+    enum:
+      - qcom,sdm845-cpu-bwmon       # BWMON v4
+
+  interconnects:
+    maxItems: 2
+
+  interconnect-names:
+    items:
+      - const: ddr
+      - const: l3c
+
+  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
+  - interconnect-names
+  - interrupts
+  - operating-points-v2
+  - opp-table
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interconnect/qcom,osm-l3.h>
+    #include <dt-bindings/interconnect/qcom,sdm845.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    pmu@1436400 {
+        compatible = "qcom,sdm845-cpu-bwmon";
+        reg = <0x01436400 0x600>;
+
+        interrupts = <GIC_SPI 581 IRQ_TYPE_LEVEL_HIGH>;
+
+        interconnects = <&gladiator_noc MASTER_APPSS_PROC 3 &mem_noc SLAVE_EBI1 3>,
+                        <&osm_l3 MASTER_OSM_L3_APPS &osm_l3 SLAVE_OSM_L3>;
+        interconnect-names = "ddr", "l3c";
+
+        operating-points-v2 = <&cpu_bwmon_opp_table>;
+
+        cpu_bwmon_opp_table: opp-table {
+            compatible = "operating-points-v2";
+
+            opp-0 {
+                opp-peak-kBps = <800000 4800000>;
+            };
+            opp-1 {
+                opp-peak-kBps = <1804000 9216000>;
+            };
+            opp-2 {
+                opp-peak-kBps = <2188000 11980800>;
+            };
+            opp-3 {
+                opp-peak-kBps = <3072000 15052800>;
+            };
+            opp-4 {
+                opp-peak-kBps = <4068000 19353600>;
+            };
+            opp-5 {
+                opp-peak-kBps = <5412000 20889600>;
+            };
+            opp-6 {
+                opp-peak-kBps = <6220000 22425600>;
+            };
+            opp-7 {
+                opp-peak-kBps = <7216000 25497600>;
+            };
+        };
+    };