drivers/rtc/rtc-at91rm9200.c: add DT support

Atmel AT91RM9200 Real Time Clock

Required properties:

- compatible: should be: "atmel,at91rm9200-rtc"

- reg: physical base address of the controller and length of memory mapped

  region.

- interrupts: rtc alarm/event interrupt

Example:

rtc@fffffe00 {

	compatible = "atmel,at91rm9200-rtc";

	reg = <0xfffffe00 0x100>;

	interrupts = <1 4 7>;

};

#include <linux/ioctl.h>

#include <linux/completion.h>

#include <linux/io.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <asm/uaccess.h>

static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume);

static const struct of_device_id at91_rtc_dt_ids[] = {

	{ .compatible = "atmel,at91rm9200-rtc" },

	{ /* sentinel */ }

};

MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids);

static struct platform_driver at91_rtc_driver = {

	.remove		= __exit_p(at91_rtc_remove),

	.driver		= {

		.name	= "at91_rtc",

		.owner	= THIS_MODULE,

		.pm	= &at91_rtc_pm_ops,

		.of_match_table = of_match_ptr(at91_rtc_dt_ids),

	},

};