bindings: altmode-glink: Change device-client linkage

Instead of linking the altmode device and client via a name string, use
a phandle instead, and specify the port index of the client along with
the phandle data as well.

Change-Id: Ica5456ab7e808e99a92d0b91e59c73c7184aa826

bindings/soc/qcom/qcom,altmode-glink.txt

@@ -15,20 +15,37 @@ REQUIRED PROPERTIES:
 	Value type: <stringlist>
 	Definition: must be "qcom,altmode-glink"
 
-- qcom,altmode-name:
+- #altmode-cells:
 	Usage: required
-	Value type: <string>
-	Definition: must be "altmode_N" where N is [0-9]
+	Value type: <u32>
+	Definition: must be <1>
 
-EXAMPLE:
+EXAMPLE of altmode node definition:
 
 &soc {
 	qcom,pmic_glink {
 		...
-		qcom,altmode {
+		altmode: qcom,altmode {
 			compatible = "qcom,altmode-glink";
-			qcom,altmode-name = "altmode_0";
+			#altmode-cells = <1>;
 		};
 		...
 	};
 };
+
+Altmode client bindings:
+
+REQUIRED PROPERTIES:
+
+- qcom,altmode-dev:
+	Usage: required
+	Value type: <phandle>
+	Definition: must be <phandle_to_altmode_node, N> where N is port index
+
+EXAMPLE of altmode client node definition:
+
+altmode-client {
+	...
+	qcom,altmode-dev = <&altmode 0>;
+	...
+}