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/init.h> 9 #include <linux/of.h> 10 #include <linux/of_address.h> 11 #include <linux/platform_device.h> 12 #include <linux/slab.h> 13 14 #include <asm/prom.h> 15 16 static __initdata struct { 17 const char *compatible; 18 char *plat_name; 19 } of_rtc_table[] = { 20 { "ds1743-nvram", "rtc-ds1742" }, 21 }; 22 23 void __init of_instantiate_rtc(void) 24 { 25 struct device_node *node; 26 int err; 27 int i; 28 29 for (i = 0; i < ARRAY_SIZE(of_rtc_table); i++) { 30 char *plat_name = of_rtc_table[i].plat_name; 31 32 for_each_compatible_node(node, NULL, 33 of_rtc_table[i].compatible) { 34 struct resource *res; 35 36 res = kmalloc(sizeof(*res), GFP_KERNEL); 37 if (!res) { 38 printk(KERN_ERR "OF RTC: Out of memory " 39 "allocating resource structure for %pOF\n", 40 node); 41 continue; 42 } 43 44 err = of_address_to_resource(node, 0, res); 45 if (err) { 46 printk(KERN_ERR "OF RTC: Error " 47 "translating resources for %pOF\n", 48 node); 49 continue; 50 } 51 52 printk(KERN_INFO "OF_RTC: %pOF is a %s @ 0x%llx-0x%llx\n", 53 node, plat_name, 54 (unsigned long long)res->start, 55 (unsigned long long)res->end); 56 platform_device_register_simple(plat_name, -1, res, 1); 57 } 58 } 59 } 60