arm: dts: Add base DTS support for v2m_beetle

This patch adds the base DTS support for the V2M Beetle board.  The
initial set of changes include SRAM, FLASH, and IRQ controller support.

Change-Id: I06685622b9c57ac358544c71350074ce06e3371e
Signed-off-by: Andy Gross <andy.gross@linaro.org>

arch/arm/soc/arm/beetle/Kconfig.defconfig.beetle_r0

@@ -11,6 +11,7 @@ if SOC_BEETLE_R0
 config SOC
 	default beetle_r0
 
+if !HAS_DTS
 #
 # Beetle R0 has one SRAM bank:
 #   128K @ 0x20000000
@@ -24,4 +25,6 @@ config SRAM_SIZE
 config FLASH_SIZE
 	default 256
 
+endif # !HAS_DTS
+
 endif # SOC_BEETLE_R0

arch/arm/soc/arm/beetle/Kconfig.defconfig.series

@@ -13,6 +13,8 @@ source "arch/arm/soc/arm/beetle/Kconfig.defconfig.beetle*"
 config SOC_SERIES
 	default beetle
 
+if !HAS_DTS
+
 config NUM_IRQ_PRIO_BITS
 	int
 	default 3
@@ -21,14 +23,16 @@ config NUM_IRQS
 	int
 	default 45
 
-config SYS_CLOCK_HW_CYCLES_PER_SEC
-	int
-	default 24000000
-
 config SRAM_BASE_ADDRESS
 	default 0x20000000
 
 config FLASH_BASE_ADDRESS
 	default 0x00000000
 
+endif # !HAS_DTS
+
+config SYS_CLOCK_HW_CYCLES_PER_SEC
+	int
+	default 24000000
+
 endif # SOC_SERIES_BEETLE

boards/arm/v2m_beetle/v2m_beetle_defconfig

@@ -31,3 +31,5 @@ CONFIG_UART_CONSOLE_ON_DEV_NAME="UART_1"
 
 # Watchdog
 CONFIG_WATCHDOG=y
+
+CONFIG_HAS_DTS=y

dts/arm/Makefile

@@ -3,5 +3,6 @@ dtb-$(CONFIG_BOARD_FRDM_K64F)	=	frdm_k64f.dts_compiled
 dtb-$(CONFIG_BOARD_HEXIWEAR_K64)	=	hexiwear_k64.dts_compiled
 dtb-$(CONFIG_BOARD_CC3200_LAUNCHXL)	=	cc3200_launchxl.dts_compiled
 dtb-$(CONFIG_BOARD_NUCLEO_L476RG)	=	nucleo_l476rg.dts_compiled
+dtb-$(CONFIG_BOARD_V2M_BEETLE)		=	v2m_beetle.dts_compiled
 always	:= $(dtb-y)
 endif

dts/arm/v2m_beetle.dts

@@ -0,0 +1,54 @@
+/dts-v1/;
+
+#include "armv7-m.dtsi"
+#include "arm/beetle/soc_irq.h"
+
+/ {
+	compatible = "arm,beetle";
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	chosen {
+		zephyr,console = &uart1;
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+	};
+
+	cpus {
+		cpu@0 {
+			compatible = "arm,cortex-m3";
+		};
+	};
+
+	sram0: memory {
+		compatible = "sram";
+		reg = <0x20000000 0x20000>;
+	};
+
+	flash0: flash {
+		reg = <0 0x40000>;
+	};
+
+	soc {
+		uart0: uart@40004000 {
+			compatible = "arm,cmsdk-uart";
+			reg = <0x40004000 0x14>;
+			interrupts = <IRQ_UART0>;
+			zephyr,irq-prio = <3>;
+			baud-rate = <115200>;
+		};
+
+		uart1: uart@40005000 {
+			compatible = "arm,cmsdk-uart";
+			reg = <0x40005000 0x14>;
+			interrupts = <IRQ_UART1>;
+			zephyr,irq-prio = <3>;
+			baud-rate = <115200>;
+		};
+	};
+};
+
+&nvic {
+	num-irq-prio-bits = <3>;
+	num-irqs = <45>;
+};

dts/arm/v2m_beetle.fixup

@@ -0,0 +1,2 @@
+#define CONFIG_NUM_IRQS			ARM_ARMV7M_NVIC_E000E100_NUM_IRQS
+#define CONFIG_NUM_IRQ_PRIO_BITS	ARM_ARMV7M_NVIC_E000E100_NUM_IRQ_PRIO_BITS

dts/arm/yaml/arm,cmsdk-uart.yaml

@@ -0,0 +1,31 @@
+---
+title: ARM CMSDK UART
+id: arm,cmsdk-uart
+version: 0.1
+
+description: >
+    This binding gives a base representation of the ARM CMSDK UART
+
+inherits:
+  - !include uart.yaml
+  - !include zephyr_devices.yaml
+
+properties:
+  - compatible:
+      type: string
+      category: required
+      description: compatible strings
+      constraint: "arm,cmsdk-uart"
+
+  - reg:
+      type: array
+      description: mmio register space
+      generation: define
+      category: required
+
+  - interrupts:
+      type: array
+      category: required
+      description: required interrupts
+      generation: define
+...

scripts/Makefile.lib

@@ -154,6 +154,7 @@ ld_flags       = $(LDFLAGS) $(ldflags-y)
 
 dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
 		 $(ZEPHYRINCLUDE)                                        \
+		 -I$(srctree)/arch/$(ARCH)/soc				 \
 		 -I$(srctree)/dts/common				 \
 		 -I$(srctree)/drivers/of/testcase-data                   \
 		 -undef -D__DTS__