LXR linux/arch/powerpc/sysdev/of

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Instantiate mmio-mapped RTC chips based on device tree information
   4 *
   5 * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
   6 */
   7#include <linux/kernel.h>
   8#include <linux/of.h>
   9#include <linux/init.h>
  10#include <linux/of_address.h>
  11#include <linux/of_platform.h>
  12#include <linux/slab.h>
  13
  14static __initdata struct {
  15        const char *compatible;
  16        char *plat_name;
  17} of_rtc_table[] = {
  18        { "ds1743-nvram", "rtc-ds1742" },
  19};
  20
  21void __init of_instantiate_rtc(void)
  22{
  23        struct device_node *node;
  24        int err;
  25        int i;
  26
  27        for (i = 0; i < ARRAY_SIZE(of_rtc_table); i++) {
  28                char *plat_name = of_rtc_table[i].plat_name;
  29
  30                for_each_compatible_node(node, NULL,
  31                                         of_rtc_table[i].compatible) {
  32                        struct resource *res;
  33
  34                        res = kmalloc(sizeof(*res), GFP_KERNEL);
  35                        if (!res) {
  36                                printk(KERN_ERR "OF RTC: Out of memory "
  37                                       "allocating resource structure for %pOF\n",
  38                                       node);
  39                                continue;
  40                        }
  41
  42                        err = of_address_to_resource(node, 0, res);
  43                        if (err) {
  44                                printk(KERN_ERR "OF RTC: Error "
  45                                       "translating resources for %pOF\n",
  46                                       node);
  47                                continue;
  48                        }
  49
  50                        printk(KERN_INFO "OF_RTC: %pOF is a %s @ 0x%llx-0x%llx\n",
  51                               node, plat_name,
  52                               (unsigned long long)res->start,
  53                               (unsigned long long)res->end);
  54                        platform_device_register_simple(plat_name, -1, res, 1);
  55                }
  56        }
  57}
  58