// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Instantiate mmio-mapped RTC chips based on device tree information
 *
 * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <asm/prom.h>

static __initdata struct {
        const char *compatible;
        char *plat_name;
} of_rtc_table[] = {
        { "ds1743-nvram", "rtc-ds1742" },
};

void __init of_instantiate_rtc(void)
{
        struct device_node *node;
        int err;
        int i;

        for (i = 0; i < ARRAY_SIZE(of_rtc_table); i++) {
                char *plat_name = of_rtc_table[i].plat_name;

                for_each_compatible_node(node, NULL,
                                         of_rtc_table[i].compatible) {
                        struct resource *res;

                        res = kmalloc_obj(*res);
                        if (!res) {
                                printk(KERN_ERR "OF RTC: Out of memory "
                                       "allocating resource structure for %pOF\n",
                                       node);
                                continue;
                        }

                        err = of_address_to_resource(node, 0, res);
                        if (err) {
                                printk(KERN_ERR "OF RTC: Error "
                                       "translating resources for %pOF\n",
                                       node);
                                continue;
                        }

                        printk(KERN_INFO "OF_RTC: %pOF is a %s @ 0x%llx-0x%llx\n",
                               node, plat_name,
                               (unsigned long long)res->start,
                               (unsigned long long)res->end);
                        platform_device_register_simple(plat_name, -1, res, 1);
                }
        }
}