arm64: dts: marvell: mcbin: add support for PCIe

Add support for PCIe with the the PCIe reset signal wired up to the
appropriate GPIO pin.
Signed-off-by: NRussell King <rmk+kernel@armlinux.org.uk>
Tested-by: NGregory CLEMENT <gregory.clement@free-electrons.com>
(excepted the reset part)
Signed-off-by: NGregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm64/boot/dts/marvell/armada-8040-mcbin.dts

@@ -161,6 +161,15 @@ ge_phy: ethernet-phy@0 {
 	};
 };
 
+&cpm_pcie0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&cpm_pcie_pins>;
+	num-lanes = <4>;
+	num-viewport = <8>;
+	reset-gpio = <&cpm_gpio1 20 GPIO_ACTIVE_LOW>;
+	status = "okay";
+};
+
 &cpm_pinctrl {
 	cpm_ge_mdio_pins: ge-mdio-pins {
 		marvell,pins = "mpp32", "mpp34";
@@ -178,6 +187,10 @@ cpm_xhci_vbus_pins: xhci0-vbus-pins {
 		marvell,pins = "mpp47";
 		marvell,function = "gpio";
 	};
+	cpm_pcie_pins: pcie-pins {
+		marvell,pins = "mpp52";
+		marvell,function = "gpio";
+	};
 	cpm_sdhci_pins: sdhci-pins {
 		marvell,pins = "mpp55", "mpp56", "mpp57", "mpp58", "mpp59",
 			       "mpp60", "mpp61";