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- // 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");
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