drivers/rtc/rtc-ds1742.c: add devicetree support

* Maxim (Dallas) DS1742/DS1743 Real Time Clock

Required properties:

- compatible: Should contain "maxim,ds1742".

- reg: Physical base address of the RTC and length of memory

  mapped region.

Example:

	rtc: rtc@10000000 {

		compatible = "maxim,ds1742";

		reg = <0x10000000 0x800>;

	};

 */

#include <linux/bcd.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/gfp.h>

#include <linux/delay.h>

#include <linux/jiffies.h>

#include <linux/rtc.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/io.h>

#include <linux/module.h>

	return 0;

}

static struct of_device_id __maybe_unused ds1742_rtc_of_match[] = {

	{ .compatible = "maxim,ds1742", },

	{ }

};

MODULE_DEVICE_TABLE(of, ds1742_rtc_of_match);

static struct platform_driver ds1742_rtc_driver = {

	.probe		= ds1742_rtc_probe,

	.remove		= ds1742_rtc_remove,

	.driver		= {

		.name	= "rtc-ds1742",

		.owner	= THIS_MODULE,

		.of_match_table = of_match_ptr(ds1742_rtc_of_match),

	},

};