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Message-Id: <20260207-sm8550-ddr-bw-scaling-v1-2-d96c3f39ac4b@gmail.com>
Date: Sat, 07 Feb 2026 19:28:07 -0600
From: Aaron Kling via B4 Relay <devnull+webgeek1234.gmail.com@...nel.org>
To: Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, Aaron Kling <webgeek1234@...il.com>
Subject: [PATCH 2/3] arm64: dts: qcom: sm8550: add cpu interconnect nodes
From: Aaron Kling <webgeek1234@...il.com>
Add the interconnect entry for each cpu, with 3 different paths:
- CPU to Last Level Cache Controller (LLCC)
- Last Level Cache Controller (LLCC) to DDR
- L3 Cache from CPU to DDR interface
Signed-off-by: Aaron Kling <webgeek1234@...il.com>
---
arch/arm64/boot/dts/qcom/sm8550.dtsi | 49 ++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/sm8550.dtsi b/arch/arm64/boot/dts/qcom/sm8550.dtsi
index 80fc437c9874fd5009ff1eaf4227b75bec5fe883..ff479684144a2b3ebf6312e3ba4ff0be88fe1803 100644
--- a/arch/arm64/boot/dts/qcom/sm8550.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8550.dtsi
@@ -17,6 +17,7 @@
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/interconnect/qcom,icc.h>
#include <dt-bindings/interconnect/qcom,sm8550-rpmh.h>
+#include <dt-bindings/interconnect/qcom,osm-l3.h>
#include <dt-bindings/mailbox/qcom-ipcc.h>
#include <dt-bindings/power/qcom-rpmpd.h>
#include <dt-bindings/power/qcom,rpmhpd.h>
@@ -78,6 +79,12 @@ cpu0: cpu@0 {
qcom,freq-domain = <&cpufreq_hw 0>;
capacity-dmips-mhz = <1024>;
dynamic-power-coefficient = <100>;
+ interconnects = <&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ACTIVE_ONLY
+ &gem_noc SLAVE_LLCC QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&mc_virt MASTER_LLCC QCOM_ICC_TAG_ACTIVE_ONLY
+ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&epss_l3 MASTER_EPSS_L3_APPS
+ &epss_l3 SLAVE_EPSS_L3_SHARED>;
#cooling-cells = <2>;
l2_0: l2-cache {
compatible = "cache";
@@ -104,6 +111,12 @@ cpu1: cpu@100 {
qcom,freq-domain = <&cpufreq_hw 0>;
capacity-dmips-mhz = <1024>;
dynamic-power-coefficient = <100>;
+ interconnects = <&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ACTIVE_ONLY
+ &gem_noc SLAVE_LLCC QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&mc_virt MASTER_LLCC QCOM_ICC_TAG_ACTIVE_ONLY
+ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&epss_l3 MASTER_EPSS_L3_APPS
+ &epss_l3 SLAVE_EPSS_L3_SHARED>;
#cooling-cells = <2>;
l2_100: l2-cache {
compatible = "cache";
@@ -125,6 +138,12 @@ cpu2: cpu@200 {
qcom,freq-domain = <&cpufreq_hw 0>;
capacity-dmips-mhz = <1024>;
dynamic-power-coefficient = <100>;
+ interconnects = <&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ACTIVE_ONLY
+ &gem_noc SLAVE_LLCC QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&mc_virt MASTER_LLCC QCOM_ICC_TAG_ACTIVE_ONLY
+ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&epss_l3 MASTER_EPSS_L3_APPS
+ &epss_l3 SLAVE_EPSS_L3_SHARED>;
#cooling-cells = <2>;
l2_200: l2-cache {
compatible = "cache";
@@ -146,6 +165,12 @@ cpu3: cpu@300 {
qcom,freq-domain = <&cpufreq_hw 1>;
capacity-dmips-mhz = <1792>;
dynamic-power-coefficient = <270>;
+ interconnects = <&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ACTIVE_ONLY
+ &gem_noc SLAVE_LLCC QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&mc_virt MASTER_LLCC QCOM_ICC_TAG_ACTIVE_ONLY
+ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&epss_l3 MASTER_EPSS_L3_APPS
+ &epss_l3 SLAVE_EPSS_L3_SHARED>;
#cooling-cells = <2>;
l2_300: l2-cache {
compatible = "cache";
@@ -167,6 +192,12 @@ cpu4: cpu@400 {
qcom,freq-domain = <&cpufreq_hw 1>;
capacity-dmips-mhz = <1792>;
dynamic-power-coefficient = <270>;
+ interconnects = <&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ACTIVE_ONLY
+ &gem_noc SLAVE_LLCC QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&mc_virt MASTER_LLCC QCOM_ICC_TAG_ACTIVE_ONLY
+ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&epss_l3 MASTER_EPSS_L3_APPS
+ &epss_l3 SLAVE_EPSS_L3_SHARED>;
#cooling-cells = <2>;
l2_400: l2-cache {
compatible = "cache";
@@ -188,6 +219,12 @@ cpu5: cpu@500 {
qcom,freq-domain = <&cpufreq_hw 1>;
capacity-dmips-mhz = <1792>;
dynamic-power-coefficient = <270>;
+ interconnects = <&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ACTIVE_ONLY
+ &gem_noc SLAVE_LLCC QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&mc_virt MASTER_LLCC QCOM_ICC_TAG_ACTIVE_ONLY
+ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&epss_l3 MASTER_EPSS_L3_APPS
+ &epss_l3 SLAVE_EPSS_L3_SHARED>;
#cooling-cells = <2>;
l2_500: l2-cache {
compatible = "cache";
@@ -209,6 +246,12 @@ cpu6: cpu@600 {
qcom,freq-domain = <&cpufreq_hw 1>;
capacity-dmips-mhz = <1792>;
dynamic-power-coefficient = <270>;
+ interconnects = <&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ACTIVE_ONLY
+ &gem_noc SLAVE_LLCC QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&mc_virt MASTER_LLCC QCOM_ICC_TAG_ACTIVE_ONLY
+ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&epss_l3 MASTER_EPSS_L3_APPS
+ &epss_l3 SLAVE_EPSS_L3_SHARED>;
#cooling-cells = <2>;
l2_600: l2-cache {
compatible = "cache";
@@ -230,6 +273,12 @@ cpu7: cpu@700 {
qcom,freq-domain = <&cpufreq_hw 2>;
capacity-dmips-mhz = <1894>;
dynamic-power-coefficient = <588>;
+ interconnects = <&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ACTIVE_ONLY
+ &gem_noc SLAVE_LLCC QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&mc_virt MASTER_LLCC QCOM_ICC_TAG_ACTIVE_ONLY
+ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ACTIVE_ONLY>,
+ <&epss_l3 MASTER_EPSS_L3_APPS
+ &epss_l3 SLAVE_EPSS_L3_SHARED>;
#cooling-cells = <2>;
l2_700: l2-cache {
compatible = "cache";
--
2.52.0
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