dt-bindings: EXYNOS: Document compatibles from other vendors

Document compatibles used on other Exynos-based boards (non-Samsung):
FriendlyARM, Google, Hardkernel and Insignal.
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Hakjoo Kim <ruppi.kim@hardkernel.com>
Reviewed-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: NKukjin Kim <kgene@kernel.org>

Documentation/devicetree/bindings/arm/samsung/samsung-boards.txt

@@ -16,7 +16,49 @@ Required root node properties:
 	- "samsung,sd5v1"	- for Exynos5440-based Samsung board.
 	- "samsung,ssdk5440"	- for Exynos5440-based Samsung board.
 
-Optional:
+* Other companies Exynos SoC based
+  * FriendlyARM
+	- "friendlyarm,tiny4412"  - for Exynos4412-based FriendlyARM
+				    TINY4412 board.
+
+  * Google
+	- "google,pi"		- for Exynos5800-based Google Peach Pi
+				  Rev 10+ board,
+	  also: "google,pi-rev16", "google,pi-rev15", "google,pi-rev14",
+		"google,pi-rev13", "google,pi-rev12", "google,pi-rev11",
+		"google,pi-rev10", "google,peach".
+
+	- "google,pit"		- for Exynos5420-based Google Peach Pit
+				  Rev 6+ (Exynos5420),
+	  also: "google,pit-rev16", "google,pit-rev15", "google,pit-rev14",
+		"google,pit-rev13", "google,pit-rev12", "google,pit-rev11",
+		"google,pit-rev10", "google,pit-rev9", "google,pit-rev8",
+		"google,pit-rev7", "google,pit-rev6", "google,peach".
+
+	- "google,snow-rev4"	- for Exynos5250-based Google Snow board,
+	  also: "google,snow"
+	- "google,snow-rev5"	- for Exynos5250-based Google Snow
+				  Rev 5+ board.
+	- "google,spring"	- for Exynos5250-based Google Spring board.
+
+  * Hardkernel
+	- "hardkernel,odroid-u3"  - for Exynos4412-based Hardkernel Odroid U3.
+	- "hardkernel,odroid-x"   - for Exynos4412-based Hardkernel Odroid X.
+	- "hardkernel,odroid-x2"  - for Exynos4412-based Hardkernel Odroid X2.
+	- "hardkernel,odroid-xu3" - for Exynos5422-based Hardkernel Odroid XU3.
+	- "hardkernel,odroid-xu3-lite" - for Exynos5422-based Hardkernel
+					 Odroid XU3 Lite board.
+	- "hardkernel,odroid-xu4" - for Exynos5422-based Hardkernel Odroid XU4.
+
+  * Insignal
+	- "insignal,arndale"      - for Exynos5250-based Insignal Arndale board.
+	- "insignal,arndale-octa" - for Exynos5420-based Insignal Arndale
+				    Octa board.
+	- "insignal,origen"       - for Exynos4210-based Insignal Origen board.
+	- "insignal,origen4412    - for Exynos4412-based Insignal Origen board.
+
+
+Optional nodes:
     - firmware node, specifying presence and type of secure firmware:
         - compatible: only "samsung,secure-firmware" is currently supported
         - reg: address of non-secure SYSRAM used for communication with firmware