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 14 static __initdata struct { 15 const char *compatible; 16 char *plat_name; 17 } of_rtc_table[] = { 18 { "ds1743-nvram", "rtc-ds1742" }, 19 }; 20 21 void __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