ARM: dts: lan966x: Add support for SMA connectors

The pcb8309 has 2 SMA connectors which are connected to the lan966x
chip. The lan966x can generate 1PPS output on one of them and it can
receive 1PPS input on the other one.
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20230421113758.3465678-1-horatiu.vultur@microchip.com

arch/arm/boot/dts/lan966x-pcb8309.dts

@@ -144,6 +144,18 @@ fc4_b_pins: fc4-b-pins {
 		function = "fc4_b";
 	};
 
+	pps_out_pins: pps-out-pins {
+		/* 1pps output */
+		pins = "GPIO_38";
+		function = "ptpsync_3";
+	};
+
+	ptp_ext_pins: ptp-ext-pins {
+		/* 1pps input */
+		pins = "GPIO_39";
+		function = "ptpsync_4";
+	};
+
 	sgpio_a_pins: sgpio-a-pins {
 		/* SCK, D0, D1, LD */
 		pins = "GPIO_32", "GPIO_33", "GPIO_34", "GPIO_35";
@@ -212,5 +224,7 @@ gpio@1 {
 };
 
 &switch {
+	pinctrl-0 = <&pps_out_pins>, <&ptp_ext_pins>;
+	pinctrl-names = "default";
 	status = "okay";
 };