arch/mips/dec: switch DECstation systems to rtc-cmos

This adds an RTC platform device for DECstation systems so that they can
use the rtc-cmos driver for their RTC device.

Signed-off-by: Maciej W. Rozycki <[e-mail]>
Cc: Alessandro Zummo <[e-mail]>
Cc: Ralf Baechle <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/mips/dec/Makefile

···
 #
 
 obj-y		:= ecc-berr.o int-handler.o ioasic-irq.o kn01-berr.o \
-		   kn02-irq.o kn02xa-berr.o reset.o setup.o time.o
+		   kn02-irq.o kn02xa-berr.o platform.o reset.o setup.o time.o
 
 obj-$(CONFIG_TC)		+= tc.o
 obj-$(CONFIG_CPU_HAS_WB)	+= wbflush.o

arch/mips/dec/platform.c

···
+/*
+ *	DEC platform devices.
+ *
+ *	Copyright (c) 2014  Maciej W. Rozycki
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License
+ *	as published by the Free Software Foundation; either version
+ *	2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/mc146818rtc.h>
+#include <linux/platform_device.h>
+
+static struct resource dec_rtc_resources[] = {
+	{
+		.name = "rtc",
+		.flags = IORESOURCE_MEM,
+	},
+};
+
+static struct cmos_rtc_board_info dec_rtc_info = {
+	.flags = CMOS_RTC_FLAGS_NOFREQ,
+	.address_space = 64,
+};
+
+static struct platform_device dec_rtc_device = {
+	.name = "rtc_cmos",
+	.id = PLATFORM_DEVID_NONE,
+	.dev.platform_data = &dec_rtc_info,
+	.resource = dec_rtc_resources,
+	.num_resources = ARRAY_SIZE(dec_rtc_resources),
+};
+
+static int __init dec_add_devices(void)
+{
+	dec_rtc_resources[0].start = RTC_PORT(0);
+	dec_rtc_resources[0].end = RTC_PORT(0) + dec_kn_slot_size - 1;
+	return platform_device_register(&dec_rtc_device);
+}
+
+device_initcall(dec_add_devices);