arm64: dts: qcom: sm8450: Add OPP table support to PCIe

PCIe host controller driver needs to choose the appropriate performance
state of RPMh power domain and interconnect bandwidth based on the PCIe
data rate.

Hence, add the OPP table support to specify RPMh performance states and
interconnect peak bandwidth.

It should be noted that the different link configurations may share the
same aggregate bandwidth, e.g., a 2.5 GT/s x2 link and a 5.0 GT/s x1
link have the same bandwidth and share the same OPP entry.

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
Link: https://lore.kernel.org/r/20240518-opp_support-v13-4-78c73edf50de@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

diff --git a/arch/arm64/boot/dts/qcom/sm8450.dtsi b/arch/arm64/boot/dts/qcom/sm8450.dtsi
index db43b70c0660e1d1843f5d51b15f88bc5a10c80d..fe9cb08042859fd6eff20c64c24dc1dfcb7ad8a4 100644 (file)
--- a/arch/arm64/boot/dts/qcom/sm8450.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8450.dtsi
@@ -1851,8 +1851,35 @@
                        pinctrl-names = "default";
                        pinctrl-0 = <&pcie0_default_state>;
 
+                       operating-points-v2 = <&pcie0_opp_table>;
+
                        status = "disabled";
 
+                       pcie0_opp_table: opp-table {
+                               compatible = "operating-points-v2";
+
+                               /* GEN 1 x1 */
+                               opp-2500000 {
+                                       opp-hz = /bits/ 64 <2500000>;
+                                       required-opps = <&rpmhpd_opp_low_svs>;
+                                       opp-peak-kBps = <250000 1>;
+                               };
+
+                               /* GEN 2 x1 */
+                               opp-5000000 {
+                                       opp-hz = /bits/ 64 <5000000>;
+                                       required-opps = <&rpmhpd_opp_low_svs>;
+                                       opp-peak-kBps = <500000 1>;
+                               };
+
+                               /* GEN 3 x1 */
+                               opp-8000000 {
+                                       opp-hz = /bits/ 64 <8000000>;
+                                       required-opps = <&rpmhpd_opp_nom>;
+                                       opp-peak-kBps = <984500 1>;
+                               };
+                       };
+
                        pcie@0 {
                                device_type = "pci";
                                reg = <0x0 0x0 0x0 0x0 0x0>;
@@ -1984,8 +2011,56 @@
                        pinctrl-names = "default";
                        pinctrl-0 = <&pcie1_default_state>;
 
+                       operating-points-v2 = <&pcie1_opp_table>;
+
                        status = "disabled";
 
+                       pcie1_opp_table: opp-table {
+                               compatible = "operating-points-v2";
+
+                               /* GEN 1 x1 */
+                               opp-2500000 {
+                                       opp-hz = /bits/ 64 <2500000>;
+                                       required-opps = <&rpmhpd_opp_low_svs>;
+                                       opp-peak-kBps = <250000 1>;
+                               };
+
+                               /* GEN 1 x2 and GEN 2 x1 */
+                               opp-5000000 {
+                                       opp-hz = /bits/ 64 <5000000>;
+                                       required-opps = <&rpmhpd_opp_low_svs>;
+                                       opp-peak-kBps = <500000 1>;
+                               };
+
+                               /* GEN 2 x2 */
+                               opp-10000000 {
+                                       opp-hz = /bits/ 64 <10000000>;
+                                       required-opps = <&rpmhpd_opp_low_svs>;
+                                       opp-peak-kBps = <1000000 1>;
+                               };
+
+                               /* GEN 3 x1 */
+                               opp-8000000 {
+                                       opp-hz = /bits/ 64 <8000000>;
+                                       required-opps = <&rpmhpd_opp_nom>;
+                                       opp-peak-kBps = <984500 1>;
+                               };
+
+                               /* GEN 3 x2 and GEN 4 x1 */
+                               opp-16000000 {
+                                       opp-hz = /bits/ 64 <16000000>;
+                                       required-opps = <&rpmhpd_opp_nom>;
+                                       opp-peak-kBps = <1969000 1>;
+                               };
+
+                               /* GEN 4 x2 */
+                               opp-32000000 {
+                                       opp-hz = /bits/ 64 <32000000>;
+                                       required-opps = <&rpmhpd_opp_nom>;
+                                       opp-peak-kBps = <3938000 1>;
+                               };
+                       };
+
                        pcie@0 {
                                device_type = "pci";
                                reg = <0x0 0x0 0x0 0x0 0x0>;