1 // SPDX-License-Identifier: GPL-2.0+
3 * PM MFD driver for Broadcom BCM2835
5 * This driver binds to the PM block and creates the MFD device for
6 * the WDT and power drivers.
9 #include <linux/delay.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>
20 static const struct mfd_cell bcm2835_pm_devs[] = {
21 { .name = "bcm2835-wdt" },
24 static const struct mfd_cell bcm2835_power_devs[] = {
25 { .name = "bcm2835-power" },
28 static int bcm2835_pm_probe(struct platform_device *pdev)
31 struct device *dev = &pdev->dev;
32 struct bcm2835_pm *pm;
35 pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
38 platform_set_drvdata(pdev, pm);
42 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
43 pm->base = devm_ioremap_resource(dev, res);
45 return PTR_ERR(pm->base);
47 ret = devm_mfd_add_devices(dev, -1,
48 bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
53 /* Map the RPiVid ASB regs if present. */
54 res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
56 pm->rpivid_asb = devm_ioremap_resource(dev, res);
57 if (IS_ERR(pm->rpivid_asb)) {
58 dev_err(dev, "Failed to map RPiVid ASB: %ld\n",
59 PTR_ERR(pm->rpivid_asb));
60 return PTR_ERR(pm->rpivid_asb);
64 /* We'll use the presence of the AXI ASB regs in the
65 * bcm2835-pm binding as the key for whether we can reference
66 * the full PM register range and support power domains.
68 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
70 pm->asb = devm_ioremap_resource(dev, res);
72 return PTR_ERR(pm->asb);
74 ret = devm_mfd_add_devices(dev, -1,
76 ARRAY_SIZE(bcm2835_power_devs),
85 static const struct of_device_id bcm2835_pm_of_match[] = {
86 { .compatible = "brcm,bcm2835-pm-wdt", },
87 { .compatible = "brcm,bcm2835-pm", },
90 MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
92 static struct platform_driver bcm2835_pm_driver = {
93 .probe = bcm2835_pm_probe,
96 .of_match_table = bcm2835_pm_of_match,
99 module_platform_driver(bcm2835_pm_driver);
101 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
102 MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
103 MODULE_LICENSE("GPL");