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, 0, NULL); 27 if (IS_ERR(dcdc_membase)) 28 return PTR_ERR(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 49int __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