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kernel add
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/*
* Instantiate mmio-mapped RTC chips based on device tree information
*
* Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/slab.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(sizeof(*res), GFP_KERNEL);
if (!res) {
printk(KERN_ERR "OF RTC: Out of memory "
"allocating resource structure for %s
",
node->full_name);
continue;
}
err = of_address_to_resource(node, 0, res);
if (err) {
printk(KERN_ERR "OF RTC: Error "
"translating resources for %s
",
node->full_name);
continue;
}
printk(KERN_INFO "OF_RTC: %s is a %s @ 0x%llx-0x%llx
",
node->full_name, plat_name,
(unsigned long long)res->start,
(unsigned long long)res->end);
platform_device_register_simple(plat_name, -1, res, 1);
}
}
}
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