// 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");