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MIPS: Lantiq: Adds minimal dcdc driver

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This driver so far only reads the core voltage.

Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5677/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
John Crispin 2013-08-08 14:02:23 +02:00 committed by Ralf Baechle
parent 17efb59adc
commit 45d3f186cf
2 changed files with 64 additions and 1 deletions
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2
arch/mips/lantiq/xway/Makefile
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@ -1,3 +1,3 @@
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

63
arch/mips/lantiq/xway/dcdc.c Normal file
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@ -0,0 +1,63 @@
/*
* 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);