1// SPDX-License-Identifier: GPL-2.0+
 2/*
 3 * PM MFD driver for Broadcom BCM2835
 4 *
 5 * This driver binds to the PM block and creates the MFD device for
 6 * the WDT and power drivers.
 7 */
 8
 9#include <linux/delay.h>
10#include <linux/io.h>
11#include <linux/mfd/bcm2835-pm.h>
12#include <linux/mfd/core.h>
13#include <linux/module.h>
14#include <linux/of_address.h>
15#include <linux/of_platform.h>
16#include <linux/platform_device.h>
17#include <linux/types.h>
18#include <linux/watchdog.h>
19
20static const struct mfd_cell bcm2835_pm_devs[] = {
21	{ .name = "bcm2835-wdt" },
22};
23
24static const struct mfd_cell bcm2835_power_devs[] = {
25	{ .name = "bcm2835-power" },
26};
27
28static int bcm2835_pm_probe(struct platform_device *pdev)
29{
30	struct resource *res;
31	struct device *dev = &pdev->dev;
32	struct bcm2835_pm *pm;
33	int ret;
34
35	pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
36	if (!pm)
37		return -ENOMEM;
38	platform_set_drvdata(pdev, pm);
39
40	pm->dev = dev;
41
42	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
43	pm->base = devm_ioremap_resource(dev, res);
44	if (IS_ERR(pm->base))
45		return PTR_ERR(pm->base);
46
47	ret = devm_mfd_add_devices(dev, -1,
48				   bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
49				   NULL, 0, NULL);
50	if (ret)
51		return ret;
52
53	/* We'll use the presence of the AXI ASB regs in the
54	 * bcm2835-pm binding as the key for whether we can reference
55	 * the full PM register range and support power domains.
56	 */
57	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
58	if (res) {
59		pm->asb = devm_ioremap_resource(dev, res);
60		if (IS_ERR(pm->asb))
61			return PTR_ERR(pm->asb);
62
63		ret = devm_mfd_add_devices(dev, -1,
64					   bcm2835_power_devs,
65					   ARRAY_SIZE(bcm2835_power_devs),
66					   NULL, 0, NULL);
67		if (ret)
68			return ret;
69	}
70
71	return 0;
72}
73
74static const struct of_device_id bcm2835_pm_of_match[] = {
75	{ .compatible = "brcm,bcm2835-pm-wdt", },
76	{ .compatible = "brcm,bcm2835-pm", },
77	{},
78};
79MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
80
81static struct platform_driver bcm2835_pm_driver = {
82	.probe		= bcm2835_pm_probe,
83	.driver = {
84		.name =	"bcm2835-pm",
85		.of_match_table = bcm2835_pm_of_match,
86	},
87};
88module_platform_driver(bcm2835_pm_driver);
89
90MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
91MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
92MODULE_LICENSE("GPL");