// SPDX-License-Identifier: GPL-2.0+
|
/*
|
* PM MFD driver for Broadcom BCM2835
|
*
|
* This driver binds to the PM block and creates the MFD device for
|
* the WDT and power drivers.
|
*/
|
|
#include <linux/delay.h>
|
#include <linux/io.h>
|
#include <linux/mfd/bcm2835-pm.h>
|
#include <linux/mfd/core.h>
|
#include <linux/module.h>
|
#include <linux/of_address.h>
|
#include <linux/of_platform.h>
|
#include <linux/platform_device.h>
|
#include <linux/types.h>
|
#include <linux/watchdog.h>
|
|
static const struct mfd_cell bcm2835_pm_devs[] = {
|
{ .name = "bcm2835-wdt" },
|
};
|
|
static const struct mfd_cell bcm2835_power_devs[] = {
|
{ .name = "bcm2835-power" },
|
};
|
|
static int bcm2835_pm_probe(struct platform_device *pdev)
|
{
|
struct resource *res;
|
struct device *dev = &pdev->dev;
|
struct bcm2835_pm *pm;
|
int ret;
|
|
pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
|
if (!pm)
|
return -ENOMEM;
|
platform_set_drvdata(pdev, pm);
|
|
pm->dev = dev;
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
pm->base = devm_ioremap_resource(dev, res);
|
if (IS_ERR(pm->base))
|
return PTR_ERR(pm->base);
|
|
ret = devm_mfd_add_devices(dev, -1,
|
bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
|
NULL, 0, NULL);
|
if (ret)
|
return ret;
|
|
/* We'll use the presence of the AXI ASB regs in the
|
* bcm2835-pm binding as the key for whether we can reference
|
* the full PM register range and support power domains.
|
*/
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
if (res) {
|
pm->asb = devm_ioremap_resource(dev, res);
|
if (IS_ERR(pm->asb))
|
return PTR_ERR(pm->asb);
|
|
ret = devm_mfd_add_devices(dev, -1,
|
bcm2835_power_devs,
|
ARRAY_SIZE(bcm2835_power_devs),
|
NULL, 0, NULL);
|
if (ret)
|
return ret;
|
}
|
|
return 0;
|
}
|
|
static const struct of_device_id bcm2835_pm_of_match[] = {
|
{ .compatible = "brcm,bcm2835-pm-wdt", },
|
{ .compatible = "brcm,bcm2835-pm", },
|
{},
|
};
|
MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
|
|
static struct platform_driver bcm2835_pm_driver = {
|
.probe = bcm2835_pm_probe,
|
.driver = {
|
.name = "bcm2835-pm",
|
.of_match_table = bcm2835_pm_of_match,
|
},
|
};
|
module_platform_driver(bcm2835_pm_driver);
|
|
MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
|
MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
|
MODULE_LICENSE("GPL");
|
