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@xxxxxxxxx>
Signed-off-by: Thara Gopinath <thara.gopinath@xxxxxxxxx>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
---
arch/arm64/boot/dts/qcom/sdm845.dtsi | 37 ++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
index 83e8b63f0910..e65dedfa6cee 100644
--- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
@@ -2026,6 +2026,43 @@ llcc: system-cache-controller@1100000 {
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>,
--
2.34.1
