arm64: dts: rockchip: Add NanoPC T6 PCIe e-key support

before
~~~~
0000:00:00.0 PCI bridge: Rockchip Electronics Co., Ltd RK3588 (rev 01)
0002:20:00.0 PCI bridge: Rockchip Electronics Co., Ltd RK3588 (rev 01)
0002:21:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 05)
0004:40:00.0 PCI bridge: Rockchip Electronics Co., Ltd RK3588 (rev 01)
0004:41:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 05)

after
~~~
0000:00:00.0 PCI bridge: Rockchip Electronics Co., Ltd RK3588 (rev 01)
0002:20:00.0 PCI bridge: Rockchip Electronics Co., Ltd RK3588 (rev 01)
0002:21:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 05)
0003:30:00.0 PCI bridge: Rockchip Electronics Co., Ltd RK3588 (rev 01)
0003:31:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8822CE 802.11ac PCIe Wireless Network Adapter
0004:40:00.0 PCI bridge: Rockchip Electronics Co., Ltd RK3588 (rev 01)
0004:41:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 05)
Signed-off-by: John Clark <inindev@gmail.com>
Link: https://lore.kernel.org/r/20230906012305.7113-1-inindev@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dts

@@ -137,6 +137,18 @@ vbus5v0_typec: vbus5v0-typec-regulator {
 		vin-supply = <&vcc5v0_sys>;
 	};
 
+	vcc3v3_pcie2x1l0: vcc3v3-pcie2x1l0-regulator {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpio = <&gpio4 RK_PC2 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pcie_m2_1_pwren>;
+		regulator-name = "vcc3v3_pcie2x1l0";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&vcc5v0_sys>;
+	};
+
 	vcc3v3_pcie30: vcc3v3-pcie30-regulator {
 		compatible = "regulator-fixed";
 		enable-active-high;
@@ -421,6 +433,14 @@ &pcie2x1l0 {
 	status = "okay";
 };
 
+&pcie2x1l1 {
+	reset-gpios = <&gpio4 RK_PA2 GPIO_ACTIVE_HIGH>;
+	vpcie3v3-supply = <&vcc3v3_pcie2x1l0>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pcie2_1_rst>;
+	status = "okay";
+};
+
 &pcie2x1l2 {
 	reset-gpios = <&gpio4 RK_PA4 GPIO_ACTIVE_HIGH>;
 	vpcie3v3-supply = <&vcc_3v3_pcie20>;
@@ -467,6 +487,10 @@ pcie2_0_rst: pcie2-0-rst {
 			rockchip,pins = <4 RK_PB3 RK_FUNC_GPIO &pcfg_pull_none>;
 		};
 
+		pcie2_1_rst: pcie2-1-rst {
+			rockchip,pins = <4 RK_PA2 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+
 		pcie2_2_rst: pcie2-2-rst {
 			rockchip,pins = <4 RK_PA4 RK_FUNC_GPIO &pcfg_pull_none>;
 		};
@@ -474,6 +498,10 @@ pcie2_2_rst: pcie2-2-rst {
 		pcie_m2_0_pwren: pcie-m20-pwren {
 			rockchip,pins = <2 RK_PC5 RK_FUNC_GPIO &pcfg_pull_none>;
 		};
+
+		pcie_m2_1_pwren: pcie-m21-pwren {
+			rockchip,pins = <4 RK_PC2 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
 	};
 
 	usb {