arm64: dts: qcom: sdm845: Add CPU BWMON

Add device node for CPU-memory BWMON device (bandwidth monitoring) on
SDM845 measuring bandwidth between CPU (gladiator_noc) and Last Level
Cache (memnoc).  Usage of this BWMON allows to remove fixed bandwidth
votes from cpufreq (CPU nodes) thus achieve high memory throughput even
with lower CPU frequencies.

Co-developed-by: Thara Gopinath <thara.gopinath@gmail.com>
Signed-off-by: Thara Gopinath <thara.gopinath@gmail.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220704121730.127925-5-krzysztof.kozlowski@linaro.org

diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
index 33b502e..7fb10c2 100644 (file)
--- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
@@ -2053,6 +2053,43 @@
                        interrupts = <GIC_SPI 582 IRQ_TYPE_LEVEL_HIGH>;
                };
 
+               pmu@1436400 {
+                       compatible = "qcom,sdm845-bwmon", "qcom,msm8998-bwmon";
+                       reg = <0 0x01436400 0 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";
+
+                               /*
+                                * The interconnect path bandwidth taken from
+                                * cpu4_opp_table bandwidth for OSM L3
+                                * interconnect.  This also matches the OSM L3
+                                * from bandwidth table of qcom,cpu4-l3lat-mon
+                                * (qcom,core-dev-table, bus width: 16 bytes)
+                                * from msm-4.9 downstream kernel.
+                                */
+                               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>;
+                               };
+                       };
+               };
+
                pcie0: pci@1c00000 {
                        compatible = "qcom,pcie-sdm845";
                        reg = <0 0x01c00000 0 0x2000>,