Hi,

+	/* pi6c pcie clock generator */
+	vcc3v3_pi6c: regulator-vcc3v3-pi6c {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpios = <&gpio0 RK_PA6 GPIO_ACTIVE_HIGH>;

Although both gpio and gpios can be used here, I tend 
to use gpio to keep it consistent with other parts.
(vcc3v3_sd, vcc3v4_rf, vcc5v0_usb30_otg0 ...)

+&mdio1 {
+	rgmii_phy1: ethernet-phy@0 {

Only one rgmii phy I think '1' is not needed?
Or `phy@address: ethernet-phy@address {`

+		compatible = "ethernet-phy-ieee802.3-c22";
+		reg = <0x0>;

The phy address should be 3. Can you try it?

+		pinctrl-names = "default";
+		pinctrl-0 = <&eth1_phy_rst>;

Is pinctrl necessary here?

+&sdmmc1 {
+   ...
+	wifi: wifi@1 {
+   ...
+&uart1 {
+   ...
+	bluetooth: bluetooth {

No aliases needed.

-- 
2.25.1