BCM270X_DT: Allow multiple instances of w1-gpio overlays

Upcoming firmware will modify the address portion of node names when
their "reg" property is written by a dtparam. Modify the w1-gpio
overlays to write the gpiopin parameter value to "reg" properties, so
that multiple instances can be loaded simultaneously.

Note: The value of the "address" is unimportant - the w1 subsystem
assigns instance numbers to buses sequentially from 1, and it is
not necessary to know which bus a device is on in order to find it.

Author: Phil Elwell

arch/arm/boot/dts/overlays/w1-gpio-overlay.dts

@@ -23,7 +23,7 @@
 	fragment@1 {
 		target = <&gpio>;
 		__overlay__ {
-			w1_pins: w1_pins {
+			w1_pins: w1_pins@0 {
 				brcm,pins = <4>;
 				brcm,function = <0>; // in (initially)
 				brcm,pull = <0>; // off
@@ -33,7 +33,9 @@
 
 	__overrides__ {
 		gpiopin =       <&w1>,"gpios:4",
-				<&w1_pins>,"brcm,pins:0";
+				<&w1>,"reg:0",
+				<&w1_pins>,"brcm,pins:0",
+				<&w1_pins>,"reg:0";
 		pullup =        <&w1>,"rpi,parasitic-power:0";
 	};
 };

arch/arm/boot/dts/overlays/w1-gpio-pullup-overlay.dts

@@ -23,7 +23,7 @@
 	fragment@1 {
 		target = <&gpio>;
 		__overlay__ {
-			w1_pins: w1_pins {
+			w1_pins: w1_pins@0 {
 				brcm,pins = <4 5>;
 				brcm,function = <0 1>; // in out
 				brcm,pull = <0 0>; // off off
@@ -33,7 +33,9 @@
 
 	__overrides__ {
 		gpiopin =       <&w1>,"gpios:4",
-				<&w1_pins>,"brcm,pins:0";
+				<&w1>,"reg:0",
+				<&w1_pins>,"brcm,pins:0",
+				<&w1_pins>,"reg:0";
 		extpullup =     <&w1>,"gpios:16",
 				<&w1_pins>,"brcm,pins:4";
 		pullup =        <&w1>,"rpi,parasitic-power:0";