rtc: ds1685: use devm_platform_ioremap_resource helper

ds1685_rtc_probe(struct platform_device *pdev)

{

	struct rtc_device *rtc_dev;

	struct resource *res;

	struct ds1685_priv *rtc;

	struct ds1685_rtc_platform_data *pdata;

	u8 ctrla, ctrlb, hours;

	 * that sits behind the IOC3 PCI metadevice.

	 */

	if (pdata->alloc_io_resources) {

		/* Get the platform resources. */

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

		if (!res)

			return -ENXIO;

		rtc->size = resource_size(res);

		/* Request a memory region. */

		/* XXX: mmio-only for now. */

		if (!devm_request_mem_region(&pdev->dev, res->start, rtc->size,

					     pdev->name))

			return -EBUSY;

		/*

		 * Set the base address for the rtc, and ioremap its

		 * registers.

		 */

		rtc->regs = devm_ioremap(&pdev->dev, res->start, rtc->size);

		if (!rtc->regs)

			return -ENOMEM;

		rtc->regs = devm_platform_ioremap_resource(pdev, 0);

		if (IS_ERR(rtc->regs))

			return PTR_ERR(rtc->regs);

	}

	/* Get the register step size. */

	struct rtc_device *dev;

	void __iomem *regs;

	u32 regstep;

	size_t size;

	int irq_num;

	bool bcd_mode;

	bool no_irq;