ARM: dts: Extend exynos5420-pinctrl nodes using labels instead of paths

A previously defined Device Tree node, can be extended either by defining
a node using the same full path or by creating a label for the node and
referencing to it.

Using full paths is more error prone since if there was a typo error, a
new node will be created instead of extending the node as it was desired.
This will lead to run-time errors that could be hard to detect.

A mistyped label on the other hand, will cause a dtc compile error which
makes it easier to detect the mistake since happens at build-time instead.
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

arch/arm/boot/dts/exynos5420-pinctrl.dtsi

@@ -12,8 +12,7 @@
  * published by the Free Software Foundation.
 */
 
-/ {
-	pinctrl@13400000 {
+&pinctrl_0 {
 	gpy7: gpy7 {
 		gpio-controller;
 		#gpio-cells = <2>;
@@ -66,9 +65,9 @@ dp_hpd: dp_hpd {
 		samsung,pin-pud = <0>;
 		samsung,pin-drv = <0>;
 	};
-	};
+};
 
-	pinctrl@13410000 {
+&pinctrl_1 {
 	gpc0: gpc0 {
 		gpio-controller;
 		#gpio-cells = <2>;
@@ -284,9 +283,9 @@ sd2_bus4: sd2-bus-width4 {
 		samsung,pin-pud = <3>;
 		samsung,pin-drv = <3>;
 	};
-	};
+};
 
-	pinctrl@14000000 {
+&pinctrl_2 {
 	gpe0: gpe0 {
 		gpio-controller;
 		#gpio-cells = <2>;
@@ -374,6 +373,7 @@ cam_i2c2_bus: cam-i2c2-bus {
 		samsung,pin-pud = <3>;
 		samsung,pin-drv = <0>;
 	};
+
 	cam_spi1_bus: cam-spi1-bus {
 		samsung,pins = "gpe0-4", "gpe0-5", "gpf0-2", "gpf0-3";
 		samsung,pin-function = <4>;
@@ -412,9 +412,9 @@ cam_bayrgb_bus: cam-bayrgb-bus {
 		samsung,pin-pud = <0>;
 		samsung,pin-drv = <0>;
 	};
-	};
+};
 
-	pinctrl@14010000 {
+&pinctrl_3 {
 	gpa0: gpa0 {
 		gpio-controller;
 		#gpio-cells = <2>;
@@ -700,9 +700,9 @@ i2c10_hs_bus: i2c10-hs-bus {
 		samsung,pin-pud = <3>;
 		samsung,pin-drv = <0>;
 	};
-	};
+};
 
-	pinctrl@03860000 {
+&pinctrl_4 {
 	gpz: gpz {
 		gpio-controller;
 		#gpio-cells = <2>;
@@ -718,5 +718,4 @@ i2s0_bus: i2s0-bus {
 		samsung,pin-pud = <0>;
 		samsung,pin-drv = <0>;
 	};
-	};
 };