1 // SPDX-License-Identifier: GPL-2.0
3  * Simple Power-Managed Bus Driver
5  * Copyright (C) 2014-2015 Glider bvba
27 	const struct device *dev = &pdev->dev;  in simple_pm_bus_probe()
29 	struct device_node *np = dev->of_node;  in simple_pm_bus_probe()
31 	struct simple_pm_bus *bus;  in simple_pm_bus_probe()  local
35 	 * transparent bus device which has a different compatible string  in simple_pm_bus_probe()
37 	 * of the simple-pm-bus tasks for these devices, so return early.  in simple_pm_bus_probe()
39 	if (pdev->driver_override)  in simple_pm_bus_probe()
42 	match = of_match_device(dev->driver->of_match_table, dev);  in simple_pm_bus_probe()
44 	 * These are transparent bus devices (not simple-pm-bus matches) that  in simple_pm_bus_probe()
50 	if (match && match->data) {  in simple_pm_bus_probe()
51 		if (of_property_match_string(np, "compatible", match->compatible) == 0)  in simple_pm_bus_probe()
54 			return -ENODEV;  in simple_pm_bus_probe()
57 	bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);  in simple_pm_bus_probe()
58 	if (!bus)  in simple_pm_bus_probe()
59 		return -ENOMEM;  in simple_pm_bus_probe()
61 	bus->num_clks = devm_clk_bulk_get_all(&pdev->dev, &bus->clks);  in simple_pm_bus_probe()
62 	if (bus->num_clks < 0)  in simple_pm_bus_probe()
63 		return dev_err_probe(&pdev->dev, bus->num_clks, "failed to get clocks\n");  in simple_pm_bus_probe()
65 	dev_set_drvdata(&pdev->dev, bus);  in simple_pm_bus_probe()
67 	dev_dbg(&pdev->dev, "%s\n", __func__);  in simple_pm_bus_probe()
69 	pm_runtime_enable(&pdev->dev);  in simple_pm_bus_probe()
72 		of_platform_populate(np, NULL, lookup, &pdev->dev);  in simple_pm_bus_probe()
79 	const void *data = of_device_get_match_data(&pdev->dev);  in simple_pm_bus_remove()
81 	if (pdev->driver_override || data)  in simple_pm_bus_remove()
84 	dev_dbg(&pdev->dev, "%s\n", __func__);  in simple_pm_bus_remove()
86 	pm_runtime_disable(&pdev->dev);  in simple_pm_bus_remove()
91 	struct simple_pm_bus *bus = dev_get_drvdata(dev);  in simple_pm_bus_runtime_suspend()  local
93 	clk_bulk_disable_unprepare(bus->num_clks, bus->clks);  in simple_pm_bus_runtime_suspend()
100 	struct simple_pm_bus *bus = dev_get_drvdata(dev);  in simple_pm_bus_runtime_resume()  local
103 	ret = clk_bulk_prepare_enable(bus->num_clks, bus->clks);  in simple_pm_bus_runtime_resume()
117 #define ONLY_BUS	((void *) 1) /* Match if the device is only a bus. */
120 	{ .compatible = "simple-pm-bus", },
121 	{ .compatible = "simple-bus",	.data = ONLY_BUS },
122 	{ .compatible = "simple-mfd",	.data = ONLY_BUS },
124 	{ .compatible = "arm,amba-bus",	.data = ONLY_BUS },
133 		.name = "simple-pm-bus",
135 		.pm = pm_ptr(&simple_pm_bus_pm_ops),
141 MODULE_DESCRIPTION("Simple Power-Managed Bus Driver");