arm64: dts: qcom: sc8280xp: add missing PCIe minimum OPP

Add the missing PCIe CX performance level votes to avoid relying on
other drivers (e.g. USB or UFS) to maintain the nominal performance
level required for Gen3 speeds.

Fixes: 813e831 ("arm64: dts: qcom: sc8280xp/sa8540p: add PCIe2-4 nodes")
Cc: [email protected]      # 6.2
Reviewed-by: Konrad Dybcio <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Andersson <[email protected]>

Author: jhovold

arch/arm64/boot/dts/qcom/sc8280xp.dtsi

@@ -1774,6 +1774,7 @@
 			reset-names = "pci";
 
 			power-domains = <&gcc PCIE_4_GDSC>;
+			required-opps = <&rpmhpd_opp_nom>;
 
 			phys = <&pcie4_phy>;
 			phy-names = "pciephy";
@@ -1872,6 +1873,7 @@
 			reset-names = "pci";
 
 			power-domains = <&gcc PCIE_3B_GDSC>;
+			required-opps = <&rpmhpd_opp_nom>;
 
 			phys = <&pcie3b_phy>;
 			phy-names = "pciephy";
@@ -1970,6 +1972,7 @@
 			reset-names = "pci";
 
 			power-domains = <&gcc PCIE_3A_GDSC>;
+			required-opps = <&rpmhpd_opp_nom>;
 
 			phys = <&pcie3a_phy>;
 			phy-names = "pciephy";
@@ -2071,6 +2074,7 @@
 			reset-names = "pci";
 
 			power-domains = <&gcc PCIE_2B_GDSC>;
+			required-opps = <&rpmhpd_opp_nom>;
 
 			phys = <&pcie2b_phy>;
 			phy-names = "pciephy";
@@ -2169,6 +2173,7 @@
 			reset-names = "pci";
 
 			power-domains = <&gcc PCIE_2A_GDSC>;
+			required-opps = <&rpmhpd_opp_nom>;
 
 			phys = <&pcie2a_phy>;
 			phy-names = "pciephy";