On Sunday, July 10, 2016 3:27:21 PM CEST Wan Zongshun wrote:

+
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/reboot.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/sys_soc.h>
+#include <linux/semaphore.h>
+
+#include <asm/system_misc.h>
+#include <asm/mach/arch.h>
+
+static void __init nuc900_machine_init(void)
+{
+       of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+}

This is the default for .init_machine, so you can leave the function
undefined.

+static const char *nuc900_dt_compat[] __initconst = {
+       "nuvoton,nuc970",
+       NULL,
+};
+
+DT_MACHINE_START(nuc900_dt, "Nuvoton NUC900 (Device Tree Support)")
+       .init_machine   = nuc900_machine_init,
+       .dt_compat      = nuc900_dt_compat,
+MACHINE_END

After that, you can probably remove most of the #include statements.
The file is still needed for now, until you move to ARCH_MULTIPLATFORM,
at which point the entire machine descriptor is redundant.

	Arnd