arm64: dts: qcom: sm8650: Add opp-level to indicate PCIe data rates

The existing OPP table for PCIe is shared across different link
configurations such as data rates 8GT/s x2 and 16GT/s x1. These
configurations often operate at the same frequency, allowing them
to reuse the same OPP entries. However, 8GT/s and 16 GT/s may have
different RPMh votes which cannot be represented accurately when
sharing a single OPP.

To address this, introduce an `opp-level` to indicate the PCIe data
rate and uniquely differentiate OPP entries even when the frequenc
is the same.

Although this platform does not currently suffer from this issue, the
change is introduced to support unification across platforms.

Append the opp level to name of the opp node to indicate both frequency
and level.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>
Acked-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://lore.kernel.org/r/20251013-opp_pcie-v5-3-eb64db2b4bd3@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

diff --git a/arch/arm64/boot/dts/qcom/sm8650.dtsi b/arch/arm64/boot/dts/qcom/sm8650.dtsi
index 3b03c135393863fc5a72927a2e7f730eef85c0c8..1a323f4ebdd35418d28af720d95e60544161e2e0 100644 (file)
--- a/arch/arm64/boot/dts/qcom/sm8650.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8650.dtsi
@@ -3659,39 +3659,52 @@
                        pcie0_opp_table: opp-table {
                                compatible = "operating-points-v2";
 
-                               /* GEN 1 x1 */
-                               opp-2500000 {
+                               /* 2.5 GT/s x1 */
+                               opp-2500000-1 {
                                        opp-hz = /bits/ 64 <2500000>;
                                        required-opps = <&rpmhpd_opp_low_svs>;
                                        opp-peak-kBps = <250000 1>;
+                                       opp-level = <1>;
                                };
 
-                               /* GEN 1 x2 and GEN 2 x1 */
-                               opp-5000000 {
+                               /* 2.5 GT/s x2 */
+                               opp-5000000-1 {
                                        opp-hz = /bits/ 64 <5000000>;
                                        required-opps = <&rpmhpd_opp_low_svs>;
                                        opp-peak-kBps = <500000 1>;
+                                       opp-level = <1>;
                                };
 
-                               /* GEN 2 x2 */
-                               opp-10000000 {
+                               /* 5 GT/s x1 */
+                               opp-5000000-2 {
+                                       opp-hz = /bits/ 64 <5000000>;
+                                       required-opps = <&rpmhpd_opp_low_svs>;
+                                       opp-peak-kBps = <500000 1>;
+                                       opp-level = <2>;
+                               };
+
+                               /* 5 GT/s x2 */
+                               opp-10000000-2 {
                                        opp-hz = /bits/ 64 <10000000>;
                                        required-opps = <&rpmhpd_opp_low_svs>;
                                        opp-peak-kBps = <1000000 1>;
+                                       opp-level = <2>;
                                };
 
-                               /* GEN 3 x1 */
-                               opp-8000000 {
+                               /* 8 GT/s x1 */
+                               opp-8000000-3 {
                                        opp-hz = /bits/ 64 <8000000>;
                                        required-opps = <&rpmhpd_opp_nom>;
                                        opp-peak-kBps = <984500 1>;
+                                       opp-level = <3>;
                                };
 
-                               /* GEN 3 x2 */
-                               opp-16000000 {
+                               /* 8 GT/s x2 */
+                               opp-16000000-3 {
                                        opp-hz = /bits/ 64 <16000000>;
                                        required-opps = <&rpmhpd_opp_nom>;
                                        opp-peak-kBps = <1969000 1>;
+                                       opp-level = <3>;
                                };
                        };
 
@@ -3839,46 +3852,68 @@
                        pcie1_opp_table: opp-table {
                                compatible = "operating-points-v2";
 
-                               /* GEN 1 x1 */
-                               opp-2500000 {
+                               /* 2.5 GT/s x1 */
+                               opp-2500000-1 {
                                        opp-hz = /bits/ 64 <2500000>;
                                        required-opps = <&rpmhpd_opp_low_svs>;
                                        opp-peak-kBps = <250000 1>;
+                                       opp-level = <1>;
                                };
 
-                               /* GEN 1 x2 and GEN 2 x1 */
-                               opp-5000000 {
+                               /* 2.5 GT/s x2 */
+                               opp-5000000-1 {
                                        opp-hz = /bits/ 64 <5000000>;
                                        required-opps = <&rpmhpd_opp_low_svs>;
                                        opp-peak-kBps = <500000 1>;
+                                       opp-level = <1>;
                                };
 
-                               /* GEN 2 x2 */
-                               opp-10000000 {
+                               /* 5 GT/s x1 */
+                               opp-5000000-2 {
+                                       opp-hz = /bits/ 64 <5000000>;
+                                       required-opps = <&rpmhpd_opp_low_svs>;
+                                       opp-peak-kBps = <500000 1>;
+                                       opp-level = <2>;
+                               };
+
+                               /* 5 GT/s x2 */
+                               opp-10000000-2 {
                                        opp-hz = /bits/ 64 <10000000>;
                                        required-opps = <&rpmhpd_opp_low_svs>;
                                        opp-peak-kBps = <1000000 1>;
+                                       opp-level = <2>;
                                };
 
-                               /* GEN 3 x1 */
-                               opp-8000000 {
+                               /* 8 GT/s x1 */
+                               opp-8000000-3 {
                                        opp-hz = /bits/ 64 <8000000>;
                                        required-opps = <&rpmhpd_opp_nom>;
                                        opp-peak-kBps = <984500 1>;
+                                       opp-level = <3>;
+                               };
+
+                               /* 8 GT/s x2 */
+                               opp-16000000-3 {
+                                       opp-hz = /bits/ 64 <16000000>;
+                                       required-opps = <&rpmhpd_opp_nom>;
+                                       opp-peak-kBps = <1969000 1>;
+                                       opp-level = <3>;
                                };
 
-                               /* GEN 3 x2 and GEN 4 x1 */
-                               opp-16000000 {
+                               /* 16 GT/s x1 */
+                               opp-16000000-4 {
                                        opp-hz = /bits/ 64 <16000000>;
                                        required-opps = <&rpmhpd_opp_nom>;
                                        opp-peak-kBps = <1969000 1>;
+                                       opp-level = <4>;
                                };
 
-                               /* GEN 4 x2 */
-                               opp-32000000 {
+                               /* 16 GT/s x2 */
+                               opp-32000000-4 {
                                        opp-hz = /bits/ 64 <32000000>;
                                        required-opps = <&rpmhpd_opp_nom>;
                                        opp-peak-kBps = <3938000 1>;
+                                       opp-level = <4>;
                                };
                        };