platform.c

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