staging: omap-thermal: update DT entry documentation

Simple update on documentation file for DT. This patch
also adds an example for OMAP4430 and 0MAP4470, and also updated
OMAP4460's example.
Signed-off-by: NEduardo Valentin <eduardo.valentin@ti.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/omap-thermal/omap_bandgap.txt

@@ -10,21 +10,42 @@ to the silicon temperature.
 
 Required properties:
 - compatible : Should be:
-  - "ti,omap4460-control-bandgap" : for OMAP4460 bandgap
-  - "ti,omap5430-control-bandgap" : for OMAP5430 bandgap
+  - "ti,omap4430-bandgap" : for OMAP4430 bandgap
+  - "ti,omap4460-bandgap" : for OMAP4460 bandgap
+  - "ti,omap4470-bandgap" : for OMAP4470 bandgap
+  - "ti,omap5430-bandgap" : for OMAP5430 bandgap
 - interrupts : this entry should indicate which interrupt line
 the talert signal is routed to;
 Specific:
 - ti,tshut-gpio : this entry should be used to inform which GPIO
 line the tshut signal is routed to;
+- regs : this entry must also be specified and it is specific
+to each bandgap version, because the mapping may change from
+soc to soc, apart of depending on available features.
 
 Example:
+OMAP4430:
+bandgap {
+	reg = <0x4a002260 0x4 0x4a00232C 0x4>;
+	compatible = "ti,omap4430-bandgap";
+};
+
+OMAP4460:
+bandgap {
+	reg = <0x4a002260 0x4
+		0x4a00232C 0x4
+		0x4a002378 0x18>;
+	compatible = "ti,omap4460-bandgap";
+	interrupts = <0 126 4>; /* talert */
+	ti,tshut-gpio = <86>;
+};
 
+OMAP4470:
 bandgap {
 	reg = <0x4a002260 0x4
 		0x4a00232C 0x4
 		0x4a002378 0x18>;
-	compatible = "ti,omap4460-control-bandgap";
+	compatible = "ti,omap4470-bandgap";
 	interrupts = <0 126 4>; /* talert */
 	ti,tshut-gpio = <86>;
 };