MIPS: Lantiq: Adds minimal dcdc driver

obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o

obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o dcdc.o

obj-$(CONFIG_XRX200_PHY_FW) += xrx200_phy_fw.o

/*

 *  This program is free software; you can redistribute it and/or modify it

 *  under the terms of the GNU General Public License version 2 as published

 *  by the Free Software Foundation.

 *

 *  Copyright (C) 2012 John Crispin <blogic@openwrt.org>

 *  Copyright (C) 2010 Sameer Ahmad, Lantiq GmbH

 */

#include <linux/ioport.h>

#include <linux/of_platform.h>

#include <lantiq_soc.h>

/* Bias and regulator Setup Register */

#define DCDC_BIAS_VREG0	0xa

/* Bias and regulator Setup Register */

#define DCDC_BIAS_VREG1	0xb

#define dcdc_w8(x, y)	ltq_w8((x), dcdc_membase + (y))

#define dcdc_r8(x)	ltq_r8(dcdc_membase + (x))

static void __iomem *dcdc_membase;

static int dcdc_probe(struct platform_device *pdev)

{

	struct resource *res;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	dcdc_membase = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(dcdc_membase))

		return PTR_ERR(dcdc_membase);

	dev_info(&pdev->dev, "Core Voltage : %d mV\n",

		dcdc_r8(DCDC_BIAS_VREG1) * 8);

	return 0;

}

static const struct of_device_id dcdc_match[] = {

	{ .compatible = "lantiq,dcdc-xrx200" },

	{},

};

static struct platform_driver dcdc_driver = {

	.probe = dcdc_probe,

	.driver = {

		.name = "dcdc-xrx200",

		.owner = THIS_MODULE,

		.of_match_table = dcdc_match,

	},

};

int __init dcdc_init(void)

{

	int ret = platform_driver_register(&dcdc_driver);

	if (ret)

		pr_info("dcdc: Error registering platform driver\n");

	return ret;

}

arch_initcall(dcdc_init);