ARM: mach-shmobile: r8a7740 generic board support via DT

Add generic DT board support for the r8a7740 SoC.

SCIF serial ports and timers are kept as regular
platform devices. Other on-chip and on-board devices
should be configured via the device tree.

At this point there is no interrupt controller support
in place but such code will be added over time when
proper IRQ domain support has been added to INTC.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

2 files changed, 68 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/r8a7740.dtsi b/arch/arm/boot/dts/r8a7740.dtsi
new file mode 100644
index 000000000000..798fa35c0005
--- /dev/null
+++ b/arch/arm/boot/dts/r8a7740.dtsi
@@ -0,0 +1,21 @@
+/*
+ * Device Tree Source for the r8a7740 SoC
+ *
+ * Copyright (C) 2012 Renesas Solutions Corp.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2.  This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+/include/ "skeleton.dtsi"
+
+/ {
+	compatible = "renesas,r8a7740";
+
+	cpus {
+		cpu@0 {
+			compatible = "arm,cortex-a9";
+		};
+	};
+};
diff --git a/arch/arm/mach-shmobile/setup-r8a7740.c b/arch/arm/mach-shmobile/setup-r8a7740.c
index c006d8ddbbe5..78948a9dba0e 100644
--- a/arch/arm/mach-shmobile/setup-r8a7740.c
+++ b/arch/arm/mach-shmobile/setup-r8a7740.c
@@ -23,6 +23,7 @@
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
+#include <linux/of_platform.h>
 #include <linux/serial_sci.h>
 #include <linux/sh_dma.h>
 #include <linux/sh_timer.h>
@@ -716,3 +717,49 @@ void __init r8a7740_add_early_devices(void)
 	/* override timer setup with soc-specific code */
 	shmobile_timer.init = r8a7740_earlytimer_init;
 }
+
+#ifdef CONFIG_USE_OF
+
+void __init r8a7740_add_early_devices_dt(void)
+{
+	shmobile_setup_delay(800, 1, 3); /* Cortex-A9 @ 800MHz */
+
+	early_platform_add_devices(r8a7740_early_devices,
+				   ARRAY_SIZE(r8a7740_early_devices));
+
+	/* setup early console here as well */
+	shmobile_setup_console();
+}
+
+static const struct of_dev_auxdata r8a7740_auxdata_lookup[] __initconst = {
+	{ }
+};
+
+void __init r8a7740_add_standard_devices_dt(void)
+{
+	/* clocks are setup late during boot in the case of DT */
+	r8a7740_clock_init(0);
+
+	platform_add_devices(r8a7740_early_devices,
+			    ARRAY_SIZE(r8a7740_early_devices));
+
+	of_platform_populate(NULL, of_default_bus_match_table,
+			     r8a7740_auxdata_lookup, NULL);
+}
+
+static const char *r8a7740_boards_compat_dt[] __initdata = {
+	"renesas,r8a7740",
+	NULL,
+};
+
+DT_MACHINE_START(SH7372_DT, "Generic R8A7740 (Flattened Device Tree)")
+	.map_io		= r8a7740_map_io,
+	.init_early	= r8a7740_add_early_devices_dt,
+	.init_irq	= r8a7740_init_irq,
+	.handle_irq	= shmobile_handle_irq_intc,
+	.init_machine	= r8a7740_add_standard_devices_dt,
+	.timer		= &shmobile_timer,
+	.dt_compat	= r8a7740_boards_compat_dt,
+MACHINE_END
+
+#endif /* CONFIG_USE_OF */