arm64: renesas: add Salvator-X board support on DTS

From: Kuninori Morimoto <[email protected]>

Add initial board support for r8a7795 Salvator-X. At this point only DEBUG0 and DEBUG1 serial ports are supported.

---

Changes since V9: (Magnus Damm <[email protected]>)
- Added board specific EXTAL information by folding in:
[PATCH][RFC] arm64: renesas: Add EXTAL configuration to Salvator-X

Changes since V8: (Magnus Damm <[email protected]>)
- None

Changes since V7: (Magnus Damm <[email protected]>)
- Added changelog

Based on:
[PATCH 15/25] arm64: renesas: add Salvator-X board support on DTS [PATCH 5/5] arm64: renesas: salvator-x: Update SCIF2 pin group [PATCH 5/6] arm64: renesas: salvator-x: Enable SCIF1 on serial1

 Documentation/devicetree/bindings/arm/shmobile.txt |    2 
 arch/arm64/boot/dts/renesas/Makefile               |    2 
 arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts |   62 ++++++++++++++++++++
 3 files changed, 66 insertions(+)

@@ -57,5 +57,7 @@ Boards:
     compatible = "renesas,lager", "renesas,r8a7790"
   - Marzen
     compatible = "renesas,marzen", "renesas,r8a7779"
+  - Salvator-X
+    compatible = "renesas,salvator-x", "renesas,r8a7795";
   - Silk
     compatible = "renesas,silk", "renesas,r8a7794";

@@ -1,2 +1,4 @@
+dtb-$(CONFIG_ARCH_R8A7795) += r8a7795-salvator-x.dtb
+
 always		:= $(dtb-y)
 clean-files	:= *.dtb