ARM: mach-shmobile: r8a7779: Minimal setup using DT

Allow a minimal setup of the r8a7779 SoC using a flattened device tree.
In particular, configure the i2c and ethernet controllers using a
flattened device tree.

SCI serial controller and TMU clock source, whose drivers do not yet
support configuration using a flattened device tree, are still configured
using C code in order to allow booting of a board with this SoC.

The ethernet controller also requires a regulator which is a board property.
A sample snippet DT for the marzen board is as follows:

/dts-v1/;
/include/ "r8a7779.dtsi"

/ {
	fixedregulator3v3: fixedregulator@0 {
		compatible = "regulator-fixed";
		regulator-name = "fixed-3.3V";
		regulator-min-microvolt = <3300000>;
		regulator-max-microvolt = <3300000>;
		regulator-boot-on;
		regulator-always-on;
	};
};

&lan0 {
	vddvario-supply = <&fixedregulator3v3>;
	vdd33a-supply = <&fixedregulator3v3>;
};
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7779.dtsi

@@ -47,4 +47,49 @@ gic: interrupt-controller@f0001000 {
                 reg = <0xf0001000 0x1000>,
                       <0xf0000100 0x100>;
         };
+
+	i2c0: i2c@0xffc70000 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		compatible = "renesas,rmobile-iic";
+		reg = <0xffc70000 0x1000>;
+		interrupt-parent = <&gic>;
+		interrupts = <0 79 0x4>;
+	};
+
+	i2c1: i2c@0xffc71000 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		compatible = "renesas,rmobile-iic";
+		reg = <0xffc71000 0x1000>;
+		interrupt-parent = <&gic>;
+		interrupts = <0 82 0x4>;
+	};
+
+	i2c2: i2c@0xffc72000 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		compatible = "renesas,rmobile-iic";
+		reg = <0xffc72000 0x1000>;
+		interrupt-parent = <&gic>;
+		interrupts = <0 80 0x4>;
+	};
+
+	i2c3: i2c@0xffc73000 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		compatible = "renesas,rmobile-iic";
+		reg = <0xffc73000 0x1000>;
+		interrupt-parent = <&gic>;
+		interrupts = <0 81 0x4>;
+	};
+
+	lan0: lan0@18000000 {
+		compatible = "smsc,lan9220", "smsc,lan9115";
+		reg = <0x18000000 0x100>;
+		phy-mode = "mii";
+		interrupt-parent = <&gic>;
+		interrupts = <0 28 0x4>;
+		reg-io-width = <4>;
+	};
 };

arch/arm/mach-shmobile/include/mach/common.h

@@ -63,7 +63,9 @@ extern void r8a7779_init_irq_dt(void);
 extern void r8a7779_map_io(void);
 extern void r8a7779_earlytimer_init(void);
 extern void r8a7779_add_early_devices(void);
+extern void r8a7779_add_early_devices_dt(void);
 extern void r8a7779_add_standard_devices(void);
+extern void r8a7779_add_standard_devices_dt(void);
 extern void r8a7779_clock_init(void);
 extern void r8a7779_pinmux_init(void);
 extern void r8a7779_pm_init(void);

arch/arm/mach-shmobile/setup-r8a7779.c

@@ -21,6 +21,7 @@
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
+#include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/delay.h>
 #include <linux/input.h>
@@ -321,7 +322,7 @@ static struct platform_device i2c3_device = {
 	.num_resources	= ARRAY_SIZE(rcar_i2c3_res),
 };
 
-static struct platform_device *r8a7779_early_devices[] __initdata = {
+static struct platform_device *r8a7779_early_devices_dt[] __initdata = {
 	&scif0_device,
 	&scif1_device,
 	&scif2_device,
@@ -330,15 +331,15 @@ static struct platform_device *r8a7779_early_devices[] __initdata = {
 	&scif5_device,
 	&tmu00_device,
 	&tmu01_device,
+};
+
+static struct platform_device *r8a7779_early_devices[] __initdata = {
 	&i2c0_device,
 	&i2c1_device,
 	&i2c2_device,
 	&i2c3_device,
 };
 
-static struct platform_device *r8a7779_late_devices[] __initdata = {
-};
-
 void __init r8a7779_add_standard_devices(void)
 {
 #ifdef CONFIG_CACHE_L2X0
@@ -349,10 +350,10 @@ void __init r8a7779_add_standard_devices(void)
 
 	r8a7779_init_pm_domains();
 
+	platform_add_devices(r8a7779_early_devices_dt,
+			    ARRAY_SIZE(r8a7779_early_devices_dt));
 	platform_add_devices(r8a7779_early_devices,
 			    ARRAY_SIZE(r8a7779_early_devices));
-	platform_add_devices(r8a7779_late_devices,
-			    ARRAY_SIZE(r8a7779_late_devices));
 }
 
 /* do nothing for !CONFIG_SMP or !CONFIG_HAVE_TWD */
@@ -367,6 +368,8 @@ void __init r8a7779_earlytimer_init(void)
 
 void __init r8a7779_add_early_devices(void)
 {
+	early_platform_add_devices(r8a7779_early_devices_dt,
+				   ARRAY_SIZE(r8a7779_early_devices_dt));
 	early_platform_add_devices(r8a7779_early_devices,
 				   ARRAY_SIZE(r8a7779_early_devices));
 
@@ -386,3 +389,47 @@ void __init r8a7779_add_early_devices(void)
 	 * command line in case of the marzen board.
 	 */
 }
+
+#ifdef CONFIG_USE_OF
+void __init r8a7779_add_early_devices_dt(void)
+{
+	shmobile_setup_delay(1000, 2, 4); /* Cortex-A9 @ 1000MHz */
+
+	early_platform_add_devices(r8a7779_early_devices_dt,
+				   ARRAY_SIZE(r8a7779_early_devices_dt));
+
+	/* Early serial console setup is not included here.
+	 * See comment in r8a7779_add_early_devices().
+	 */
+}
+
+static const struct of_dev_auxdata r8a7779_auxdata_lookup[] __initconst = {
+	{},
+};
+
+void __init r8a7779_add_standard_devices_dt(void)
+{
+	/* clocks are setup late during boot in the case of DT */
+	r8a7779_clock_init();
+
+	platform_add_devices(r8a7779_early_devices_dt,
+			    ARRAY_SIZE(r8a7779_early_devices_dt));
+	of_platform_populate(NULL, of_default_bus_match_table,
+			     r8a7779_auxdata_lookup, NULL);
+}
+
+static const char *r8a7779_compat_dt[] __initdata = {
+	"renesas,r8a7779",
+	NULL,
+};
+
+DT_MACHINE_START(SH73A0_DT, "Generic R8A7779 (Flattened Device Tree)")
+	.map_io		= r8a7779_map_io,
+	.init_early	= r8a7779_add_early_devices_dt,
+	.nr_irqs	= NR_IRQS_LEGACY,
+	.init_irq	= r8a7779_init_irq_dt,
+	.init_machine	= r8a7779_add_standard_devices_dt,
+	.init_time	= shmobile_timer_init,
+	.dt_compat	= r8a7779_compat_dt,
+MACHINE_END
+#endif /* CONFIG_USE_OF */