arm64: dts: add all hi6220 uart nodes

This patch adds all UART nodes for the Hi6220 SoC. Recently a board[1] has been developed to standardize UART access across all the 96boards consumer edition boards. To use this hardware on HiKey we must configure and enable UART3. However, to ensure backward compatibility we must keep UART0 enabled as well.

I have removed the hard coded clock index values in favor of using the ones already defined in include/dt-bindings/clock/hi6220-clock.h.

Since UART0 needs to be soldered, it has been suggested to use the UART3 as the default console.

This patch was boot tested on top of next-20150930, with both UART configurations.

[1] http://www.seeedstudio.com/depot/96Boards-UART-p-2525.html?ref=newInBazaar

---
In v2:
- Drop unused alias, and add comments. (Arnd, Rob)
- Switch default console to use UART3 with stdout-path. (Mark, Rob)

 arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts |  7 +++--
 arch/arm64/boot/dts/hisilicon/hi6220.dtsi      | 43 +++++++++++++++++++++++++-
 2 files changed, 47 insertions(+), 3 deletions(-)

index e36a539..aa101ac 100644
@@ -17,11 +17,14 @@
 	compatible = "hisilicon,hi6220-hikey", "hisilicon,hi6220";
 
 	aliases {
-		serial0 = &uart0;
+		serial0 = &uart0; /* On board UART0 */
+		serial1 = &uart1; /* BT UART */
+		serial2 = &uart2; /* LS Expansion UART0 */
+		serial3 = &uart3; /* LS Expansion UART1 */
 	};
 
 	chosen {
-		stdout-path = "serial0:115200n8";
+		stdout-path = "serial3:115200n8";
 	};
 
 	memory at 0 {

2.1.4

Applied to next/dt, thanks!

Arnd