xref: /OK3568_Linux_fs/kernel/arch/mips/loongson2ef/common/platform.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun  * Copyright (C) 2009 Lemote Inc.
4*4882a593Smuzhiyun  * Author: Wu Zhangjin, wuzhangjin@gmail.com
5*4882a593Smuzhiyun  */
6*4882a593Smuzhiyun 
7*4882a593Smuzhiyun #include <linux/err.h>
8*4882a593Smuzhiyun #include <linux/smp.h>
9*4882a593Smuzhiyun #include <linux/platform_device.h>
10*4882a593Smuzhiyun 
11*4882a593Smuzhiyun static struct platform_device loongson2_cpufreq_device = {
12*4882a593Smuzhiyun 	.name = "loongson2_cpufreq",
13*4882a593Smuzhiyun 	.id = -1,
14*4882a593Smuzhiyun };
15*4882a593Smuzhiyun 
loongson2_cpufreq_init(void)16*4882a593Smuzhiyun static int __init loongson2_cpufreq_init(void)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun 	struct cpuinfo_mips *c = &current_cpu_data;
19*4882a593Smuzhiyun 
20*4882a593Smuzhiyun 	/* Only 2F revision and it's successors support CPUFreq */
21*4882a593Smuzhiyun 	if ((c->processor_id & PRID_REV_MASK) >= PRID_REV_LOONGSON2F)
22*4882a593Smuzhiyun 		return platform_device_register(&loongson2_cpufreq_device);
23*4882a593Smuzhiyun 
24*4882a593Smuzhiyun 	return -ENODEV;
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun 
27*4882a593Smuzhiyun arch_initcall(loongson2_cpufreq_init);
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