ARM: BCM53573: Specify ports for USB LED for Tenda AC9

This uses trigger-sources documented in commit 80dc6e1c ("dt-bindings:
leds: document new trigger-sources property") to specify USB ports. Such an
information can be used by operating system to setup LEDs behavior.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm47189-tenda-ac9.dts

@@ -26,6 +26,8 @@ leds {
 		usb {
 			label = "bcm53xx:blue:usb";
 			gpios = <&chipcommon 1 GPIO_ACTIVE_HIGH>;
+			trigger-sources = <&ohci_port1>, <&ehci_port1>;
+			linux,default-trigger = "usbport";
 		};
 
 		wps {

arch/arm/boot/dts/bcm53573.dtsi

@@ -138,10 +138,12 @@ ehci: ehci@4000 {
 
 				ehci_port1: port@1 {
 					reg = <1>;
+					#trigger-source-cells = <0>;
 				};
 
 				ehci_port2: port@2 {
 					reg = <2>;
+					#trigger-source-cells = <0>;
 				};
 			};
 
@@ -158,10 +160,12 @@ ohci: ohci@d000 {
 
 				ohci_port1: port@1 {
 					reg = <1>;
+					#trigger-source-cells = <0>;
 				};
 
 				ohci_port2: port@2 {
 					reg = <2>;
+					#trigger-source-cells = <0>;
 				};
 			};
 		};