/*
 * Setup code for PC-style Real-Time Clock.
 *
 * Author: Wade Farnsworth <wfarnsworth@mvista.com>
 *
 * 2007 (c) MontaVista Software, Inc. This file is licensed under
 * the terms of the GNU General Public License version 2. This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */

#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mc146818rtc.h>
#include <linux/of_address.h>


static int  __init add_rtc(void)
{
        struct device_node *np;
        struct platform_device *pd;
        struct resource res[2];
        unsigned int num_res = 1;
        int ret;

        memset(&res, 0, sizeof(res));

        np = of_find_compatible_node(NULL, NULL, "pnpPNP,b00");
        if (!np)
                return -ENODEV;

        ret = of_address_to_resource(np, 0, &res[0]);
        of_node_put(np);
        if (ret)
                return ret;

        /*
         * RTC_PORT(x) is hardcoded in asm/mc146818rtc.h.  Verify that the
         * address provided by the device node matches.
         */
        if (res[0].start != RTC_PORT(0))
                return -EINVAL;

        np = of_find_compatible_node(NULL, NULL, "chrp,iic");
        if (!np)
                np = of_find_compatible_node(NULL, NULL, "pnpPNP,000");
        if (np) {
                of_node_put(np);
                /*
                 * Use a fixed interrupt value of 8 since on PPC if we are
                 * using this its off an i8259 which we ensure has interrupt
                 * numbers 0..15.
                 */
                res[1].start = 8;
                res[1].end = 8;
                res[1].flags = IORESOURCE_IRQ;
                num_res++;
        }

        pd = platform_device_register_simple("rtc_cmos", -1,
                                             &res[0], num_res);

        return PTR_ERR_OR_ZERO(pd);
}
fs_initcall(add_rtc);

MODULE_DESCRIPTION("PPC RTC CMOS driver");
MODULE_LICENSE("GPL");