mvebu: LS421DE: improve pin configuration

The CLK125 output pin at the ethernet PHY is connected via capacitor to
GND and nowhere else. Disable it. Also tune the LED masks.

The MPP56 and MPP60 pins at the SoC are conected to the μPD720202 USB3.0
chip:
  - MPP56: wired to PCIe CLKREQ# (out)
  - MPP60: wired to PCIe RESET# (in)
Configure the pcie pinmux for these pins.

Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>

target/linux/mvebu/files/arch/arm/boot/dts/armada-370-buffalo-ls421de.dts

@@ -266,15 +266,19 @@
 
 	ethphy0: ethernet-phy@0 { /* Marvell 88E1518 */
 		reg = <0>;
-		marvell,reg-init = <0x3 0x10 0x1 0x1991>, /* LED function */
-				   <0x3 0x11 0x1 0x4401>, /* LED polarity */
-				   <0x3 0x12 0x1 0x4905>; /* LED timer */
+		marvell,reg-init = <0x2 0x10 0xffff 0x0006>, /* disable CLK125 */
+				   <0x3 0x10 0x0000 0x1991>, /* LED function */
+				   <0x3 0x11 0x0000 0x4401>, /* LED polarity */
+				   <0x3 0x12 0x0000 0x4905>; /* LED timer */
 		#thermal-sensor-cells = <0>;
 	};
 };
 
 &pciec {
 	status = "okay";
+	pinctrl-0 = <&pmx_pcie>;
+	pinctrl-names = "default";
+
 	/* Connected to uPD720202 USB 3.0 Host */
 	pcie@1,0 {
 		status = "okay";
@@ -436,4 +440,9 @@
 		marvell,pins = "mpp55", "mpp57", "mpp62";
 		marvell,function = "gpio";
 	};
+
+	pmx_pcie: pmx-pcie {
+		marvell,pins = "mpp56", "mpp60";
+		marvell,function = "pcie";
+	};
 };