60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Instantiate mmio-mapped RTC chips based on device tree information
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*
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* Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
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*/
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/init.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/slab.h>
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#include <asm/prom.h>
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static __initdata struct {
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const char *compatible;
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char *plat_name;
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} of_rtc_table[] = {
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{ "ds1743-nvram", "rtc-ds1742" },
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};
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void __init of_instantiate_rtc(void)
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{
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struct device_node *node;
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int err;
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int i;
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for (i = 0; i < ARRAY_SIZE(of_rtc_table); i++) {
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char *plat_name = of_rtc_table[i].plat_name;
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for_each_compatible_node(node, NULL,
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of_rtc_table[i].compatible) {
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struct resource *res;
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res = kmalloc(sizeof(*res), GFP_KERNEL);
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if (!res) {
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printk(KERN_ERR "OF RTC: Out of memory "
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"allocating resource structure for %pOF\n",
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node);
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continue;
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}
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err = of_address_to_resource(node, 0, res);
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if (err) {
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printk(KERN_ERR "OF RTC: Error "
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"translating resources for %pOF\n",
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node);
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continue;
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}
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printk(KERN_INFO "OF_RTC: %pOF is a %s @ 0x%llx-0x%llx\n",
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node, plat_name,
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(unsigned long long)res->start,
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(unsigned long long)res->end);
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platform_device_register_simple(plat_name, -1, res, 1);
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}
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}
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}
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