rtc: omap: dt support

TI Real Time Clock

Required properties:

- compatible: "ti,da830-rtc"

- reg: Address range of rtc register set

- interrupts: rtc timer, alarm interrupts in order

- interrupt-parent: phandle for the interrupt controller

Example:

rtc@1c23000 {

	compatible = "ti,da830-rtc";

	reg = <0x23000 0x1000>;

	interrupts = <19

		      19>;

	interrupt-parent = <&intc>;

};

#include <linux/rtc.h>

#include <linux/bcd.h>

#include <linux/platform_device.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <asm/io.h>

static int omap_rtc_alarm;

static int omap_rtc_timer;

#define	OMAP_RTC_DATA_DA830_IDX	1

static struct platform_device_id omap_rtc_devtype[] = {

	{

		.name	= DRIVER_NAME,

};

MODULE_DEVICE_TABLE(platform, omap_rtc_devtype);

static const struct of_device_id omap_rtc_of_match[] = {

	{	.compatible	= "ti,da830-rtc",

		.data		= &omap_rtc_devtype[OMAP_RTC_DATA_DA830_IDX],

	},

	{},

};

MODULE_DEVICE_TABLE(of, omap_rtc_of_match);

static int __init omap_rtc_probe(struct platform_device *pdev)

{

	struct resource		*res, *mem;

	struct rtc_device	*rtc;

	u8			reg, new_ctrl;

	const struct platform_device_id *id_entry;

	const struct of_device_id *of_id;

	of_id = of_match_device(omap_rtc_of_match, &pdev->dev);

	if (of_id)

		pdev->id_entry = of_id->data;

	omap_rtc_timer = platform_get_irq(pdev, 0);

	if (omap_rtc_timer <= 0) {

	.driver		= {

		.name	= DRIVER_NAME,

		.owner	= THIS_MODULE,

		.of_match_table = of_match_ptr(omap_rtc_of_match),

	},

	.id_table	= omap_rtc_devtype,

};