1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * Copyright (C) 2012 John Crispin <john@phrozen.org>
5 * Copyright (C) 2010 Sameer Ahmad, Lantiq GmbH
6 */
7
8#include <linux/ioport.h>
9#include <linux/mod_devicetable.h>
10#include <linux/platform_device.h>
11
12#include <lantiq_soc.h>
13
14/* Bias and regulator Setup Register */
15#define DCDC_BIAS_VREG0 0xa
16/* Bias and regulator Setup Register */
17#define DCDC_BIAS_VREG1 0xb
18
19#define dcdc_w8(x, y) ltq_w8((x), dcdc_membase + (y))
20#define dcdc_r8(x) ltq_r8(dcdc_membase + (x))
21
22static void __iomem *dcdc_membase;
23
24static int dcdc_probe(struct platform_device *pdev)
25{
26 dcdc_membase = devm_platform_get_and_ioremap_resource(pdev, index: 0, NULL);
27 if (IS_ERR(ptr: dcdc_membase))
28 return PTR_ERR(ptr: dcdc_membase);
29
30 dev_info(&pdev->dev, "Core Voltage : %d mV\n",
31 dcdc_r8(DCDC_BIAS_VREG1) * 8);
32
33 return 0;
34}
35
36static const struct of_device_id dcdc_match[] = {
37 { .compatible = "lantiq,dcdc-xrx200" },
38 {},
39};
40
41static struct platform_driver dcdc_driver = {
42 .probe = dcdc_probe,
43 .driver = {
44 .name = "dcdc-xrx200",
45 .of_match_table = dcdc_match,
46 },
47};
48
49static int __init dcdc_init(void)
50{
51 int ret = platform_driver_register(&dcdc_driver);
52
53 if (ret)
54 pr_info("dcdc: Error registering platform driver\n");
55 return ret;
56}
57
58arch_initcall(dcdc_init);
59

source code of linux/arch/mips/lantiq/xway/dcdc.c