ARC: [plat-arcfpga]: Enabling DeviceTree for Angel4 board

* arc-uart platform device now populated dynamically, using
  of_platform_populate() - applies to any other device whatsoever.

* uart in turn requires incore arc-intc to be also present in DT

* A irq-domain needs to be instantiated for IRQ requests by DT probed
  device (e.g. arc-uart)

TODO: switch over to linear irq domain once all devs have been
      transitioned to DT

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Arnd Bergmann <arnd@arndb.de>

3 files changed, 68 insertions, 1 deletions

diff --git a/arch/arc/boot/dts/Makefile b/arch/arc/boot/dts/Makefile
index 17dc7b8b05fa..5776835d583f 100644
--- a/arch/arc/boot/dts/Makefile
+++ b/arch/arc/boot/dts/Makefile
@@ -1,5 +1,5 @@
 # Built-in dtb
-builtindtb-y            := skeleton
+builtindtb-y            := angel4
 
 ifneq ($(CONFIG_ARC_BUILTIN_DTB_NAME),"")
         builtindtb-y    := $(patsubst "%",%,$(CONFIG_ARC_BUILTIN_DTB_NAME))
diff --git a/arch/arc/boot/dts/angel4.dts b/arch/arc/boot/dts/angel4.dts
new file mode 100644
index 000000000000..4c188d5bc10c
--- /dev/null
+++ b/arch/arc/boot/dts/angel4.dts
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+/dts-v1/;
+
+/include/ "skeleton.dtsi"
+
+/ {
+        compatible = "snps,arc-angel4";
+        clock-frequency = <80000000>;   /* 80 MHZ */
+        #address-cells = <1>;
+        #size-cells = <1>;
+        interrupt-parent = <&intc>;
+
+        chosen {
+                bootargs = "console=ttyARC0,115200n8";
+        };
+
+        aliases {
+                serial0 = &arcuart0;
+        };
+
+        memory {
+                device_type = "memory";
+                reg = <0x00000000 0x10000000>;  /* 256M */
+        };
+
+        fpga {
+                compatible = "simple-bus";
+                #address-cells = <1>;
+                #size-cells = <1>;
+
+                /* child and parent address space 1:1 mapped */
+                ranges;
+
+                intc: interrupt-controller {
+                        compatible = "snps,arc700-intc";
+                        interrupt-controller;
+                        #interrupt-cells = <1>;
+                };
+
+                arcuart0: serial@c0fc1000 {
+                        compatible = "snps,arc-uart";
+                        reg = <0xc0fc1000 0x100>;
+                        interrupts = <5>;
+                        clock-frequency = <80000000>;
+                        baud = <115200>;
+                        status = "okay";
+                };
+        };
+};
diff --git a/arch/arc/boot/dts/skeleton.dtsi b/arch/arc/boot/dts/skeleton.dtsi
index eb8b77367352..a870bdd5e404 100644
--- a/arch/arc/boot/dts/skeleton.dtsi
+++ b/arch/arc/boot/dts/skeleton.dtsi
@@ -18,6 +18,18 @@
         #size-cells = <1>;
         chosen { };
         aliases { };
+
+        cpus {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                cpu@0 {
+                        device_type = "cpu";
+                        compatible = "snps,arc770d";
+                        reg = <0>;
+                };
+        };
+
         memory {
                 device_type = "memory";
                 reg = <0x00000000 0x10000000>;  /* 256M */