ARM: dts: keystone: Add "ti,da830-uart" compatible string

The TI Keystone SoCs have extra UART registers beyond the standard 8250
registers, so we need a new compatible string to indicate this. Also, at
least one of these registers uses the full 32 bits, so we need to specify
reg-io-width in addition to reg-shift.

"ns16550a" is left in the compatible specification since it does work as
long as the bootloader configures the SoC UART power management registers.
Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>

arch/arm/boot/dts/keystone-k2g.dtsi

@@ -90,7 +90,7 @@ devctrl: device-state-control@02620000 {
 		};
 
 		uart0: serial@02530c00 {
-			compatible = "ns16550a";
+			compatible = "ti,da830-uart", "ns16550a";
 			current-speed = <115200>;
 			reg-shift = <2>;
 			reg-io-width = <4>;

arch/arm/boot/dts/keystone-k2l.dtsi

@@ -35,7 +35,7 @@ soc {
 		/include/ "keystone-k2l-clocks.dtsi"
 
 		uart2: serial@02348400 {
-			compatible = "ns16550a";
+			compatible = "ti,da830-uart", "ns16550a";
 			current-speed = <115200>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
@@ -45,7 +45,7 @@ uart2: serial@02348400 {
 		};
 
 		uart3:	serial@02348800 {
-			compatible = "ns16550a";
+			compatible = "ti,da830-uart", "ns16550a";
 			current-speed = <115200>;
 			reg-shift = <2>;
 			reg-io-width = <4>;

arch/arm/boot/dts/keystone.dtsi

@@ -98,7 +98,7 @@ rstctrl: reset-controller {
 		/include/ "keystone-clocks.dtsi"
 
 		uart0: serial@02530c00 {
-			compatible = "ns16550a";
+			compatible = "ti,da830-uart", "ns16550a";
 			current-speed = <115200>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
@@ -108,7 +108,7 @@ uart0: serial@02530c00 {
 		};
 
 		uart1:	serial@02531000 {
-			compatible = "ns16550a";
+			compatible = "ti,da830-uart", "ns16550a";
 			current-speed = <115200>;
 			reg-shift = <2>;
 			reg-io-width = <4>;