1 // SPDX-License-Identifier: GPL-2.0+
16 #include <linux/dma-mapping.h>
27 	{ .compatible = "simple-bus", },
28 	{ .compatible = "simple-mfd", },
31 	{ .compatible = "arm,amba-bus", },
37  * of_find_device_by_node - Find the platform_device associated with a node
56 	BUG_ON(ofdev->dev.of_node == NULL);  in of_device_add()
60 	ofdev->name = dev_name(&ofdev->dev);  in of_device_add()
61 	ofdev->id = PLATFORM_DEVID_NONE;  in of_device_add()
68 	set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));  in of_device_add()
70 	return device_add(&ofdev->dev);  in of_device_add()
75 	device_initialize(&pdev->dev);  in of_device_register()
82 	device_unregister(&ofdev->dev);  in of_device_unregister()
88 	{ .compatible = "operating-points-v2", },
97  * mechanism for creating devices from device tree nodes.
101  * of_device_make_bus_id - Use the device node data to assign a unique name
106  * parent nodes until a unique name can be derived.
110 	struct device_node *node = dev->of_node;  in of_device_make_bus_id()
115 	/* Construct the name, using parent nodes if necessary to ensure uniqueness */  in of_device_make_bus_id()
116 	while (node->parent) {  in of_device_make_bus_id()
125 					     addr, ffs(mask) - 1, node, dev_name(dev));  in of_device_make_bus_id()
135 			     kbasename(node->full_name), dev_name(dev));  in of_device_make_bus_id()
136 		node = node->parent;  in of_device_make_bus_id()
141  * of_device_alloc - Allocate and initialize an of_device
169 		dev->num_resources = num_reg;  in of_device_alloc()
170 		dev->resource = res;  in of_device_alloc()
178 	device_set_node(&dev->dev, of_fwnode_handle(of_node_get(np)));  in of_device_alloc()
179 	dev->dev.parent = parent ? : &platform_bus;  in of_device_alloc()
182 		dev_set_name(&dev->dev, "%s", bus_id);  in of_device_alloc()
184 		of_device_make_bus_id(&dev->dev);  in of_device_alloc()
191  * of_platform_device_create_pdata - Alloc, initialize and register an of_device
216 	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);  in of_platform_device_create_pdata()
217 	if (!dev->dev.dma_mask)  in of_platform_device_create_pdata()
218 		dev->dev.dma_mask = &dev->dev.coherent_dma_mask;  in of_platform_device_create_pdata()
219 	dev->dev.bus = &platform_bus_type;  in of_platform_device_create_pdata()
220 	dev->dev.platform_data = platform_data;  in of_platform_device_create_pdata()
221 	of_msi_configure(&dev->dev, dev->dev.of_node);  in of_platform_device_create_pdata()
236  * of_platform_device_create - Alloc, initialize and register an of_device
272 	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);  in of_amba_device_create()
273 	dev->dev.dma_mask = &dev->dev.coherent_dma_mask;  in of_amba_device_create()
276 	device_set_node(&dev->dev, of_fwnode_handle(of_node_get(node)));  in of_amba_device_create()
277 	dev->dev.parent = parent ? : &platform_bus;  in of_amba_device_create()
278 	dev->dev.platform_data = platform_data;  in of_amba_device_create()
280 		dev_set_name(&dev->dev, "%s", bus_id);  in of_amba_device_create()
282 		of_device_make_bus_id(&dev->dev);  in of_amba_device_create()
285 	of_property_read_u32(node, "arm,primecell-periphid", &dev->periphid);  in of_amba_device_create()
287 	ret = of_address_to_resource(node, 0, &dev->res);  in of_amba_device_create()
320  * of_dev_lookup() - Given a device node, lookup the preferred Linux name
333 	for (; auxdata->compatible; auxdata++) {  in of_dev_lookup()
334 		if (!of_device_is_compatible(np, auxdata->compatible))  in of_dev_lookup()
338 			if (res.start != auxdata->phys_addr)  in of_dev_lookup()
340 		pr_debug("%pOF: devname=%s\n", np, auxdata->name);  in of_dev_lookup()
349 	for (; auxdata->compatible; auxdata++) {  in of_dev_lookup()
350 		if (!of_device_is_compatible(np, auxdata->compatible))  in of_dev_lookup()
352 		if (!auxdata->phys_addr && !auxdata->name) {  in of_dev_lookup()
362  * of_platform_bus_create() - Create a device for a node and its children.
364  * @matches: match table for bus nodes
365  * @lookup: auxdata table for matching id and platform_data with device nodes
370  * recursively create devices for all the child nodes.
378 	struct device_node *child;  in of_platform_bus_create()  local
386 		pr_debug("%s() - skipping %pOF, no compatible prop\n",  in of_platform_bus_create()
391 	/* Skip nodes for which we don't want to create devices */  in of_platform_bus_create()
393 		pr_debug("%s() - skipping %pOF node\n", __func__, bus);  in of_platform_bus_create()
398 		pr_debug("%s() - skipping %pOF, already populated\n",  in of_platform_bus_create()
405 		bus_id = auxdata->name;  in of_platform_bus_create()
406 		platform_data = auxdata->platform_data;  in of_platform_bus_create()
422 	for_each_child_of_node(bus, child) {  in of_platform_bus_create()
423 		pr_debug("   create child: %pOF\n", child);  in of_platform_bus_create()
424 		rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);  in of_platform_bus_create()
426 			of_node_put(child);  in of_platform_bus_create()
435  * of_platform_bus_probe() - Probe the device-tree for platform buses
437  * @matches: match table for bus nodes
447 	struct device_node *child;  in of_platform_bus_probe()  local
452 		return -EINVAL;  in of_platform_bus_probe()
460 	} else for_each_child_of_node(root, child) {  in of_platform_bus_probe()
461 		if (!of_match_node(matches, child))  in of_platform_bus_probe()
463 		rc = of_platform_bus_create(child, matches, NULL, parent, false);  in of_platform_bus_probe()
465 			of_node_put(child);  in of_platform_bus_probe()
476  * of_platform_populate() - Populate platform_devices from device tree data
479  * @lookup: auxdata table for matching id and platform_data with device nodes
483  * and creates devices from nodes.  It differs in that it follows the modern
484  * convention of requiring all device nodes to have a 'compatible' property,
499 	struct device_node *child;  in of_platform_populate()  local
504 		return -EINVAL;  in of_platform_populate()
510 	for_each_child_of_node(root, child) {  in of_platform_populate()
511 		rc = of_platform_bus_create(child, matches, lookup, parent, true);  in of_platform_populate()
513 			of_node_put(child);  in of_platform_populate()
537 	{ .compatible = "qcom,rmtfs-mem" },
538 	{ .compatible = "qcom,cmd-db" },
541 	{ .compatible = "nvmem-rmem" },
542 	{ .compatible = "google,open-dice" },
553 		return -ENODEV;  in of_platform_default_populate_init()
562 		if (of_property_present(of_chosen, "linux,bootx-noscreen")) {  in of_platform_default_populate_init()
570 			dev = platform_device_alloc("bootx-noscreen", 0);  in of_platform_default_populate_init()
572 				return -ENOMEM;  in of_platform_default_populate_init()
587 			    !of_get_property(node, "linux,boot-display", NULL))  in of_platform_default_populate_init()
589 			dev = of_platform_device_create(node, "of-display", NULL);  in of_platform_default_populate_init()
592 				return -ENOMEM;  in of_platform_default_populate_init()
599 			const char *of_display_format = "of-display.%d";  in of_platform_default_populate_init()
611 		 * platform_devices for every node in /reserved-memory with a  in of_platform_default_populate_init()
623 		node = of_get_compatible_child(of_chosen, "simple-framebuffer");  in of_platform_default_populate_init()
645 	if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))  in of_platform_device_destroy()
648 	/* Recurse for any nodes that were treated as busses */  in of_platform_device_destroy()
649 	if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))  in of_platform_device_destroy()
652 	of_node_clear_flag(dev->of_node, OF_POPULATED);  in of_platform_device_destroy()
653 	of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);  in of_platform_device_destroy()
655 	if (dev->bus == &platform_bus_type)  in of_platform_device_destroy()
658 	else if (dev->bus == &amba_bustype)  in of_platform_device_destroy()
667  * of_platform_depopulate() - Remove devices populated from device tree
672  * created from their respective device tree nodes (and only those,
673  * leaving others - eg. manually created - unharmed).
677 	if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {  in of_platform_depopulate()
679 		of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);  in of_platform_depopulate()
690  * devm_of_platform_populate() - Populate platform_devices from device tree data
704 		return -EINVAL;  in devm_of_platform_populate()
709 		return -ENOMEM;  in devm_of_platform_populate()
711 	ret = of_platform_populate(dev->of_node, NULL, NULL, dev);  in devm_of_platform_populate()
736  * devm_of_platform_depopulate() - Remove devices populated from device tree
741  * created from their respective device tree nodes (and only those,
742  * leaving others - eg. manually created - unharmed).
766 		if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))  in of_platform_notify()
770 		if (of_node_check_flag(rd->dn, OF_POPULATED))  in of_platform_notify()
777 		rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE;  in of_platform_notify()
779 		pdev_parent = of_find_device_by_node(rd->dn->parent);  in of_platform_notify()
780 		pdev = of_platform_device_create(rd->dn, NULL,  in of_platform_notify()
781 				pdev_parent ? &pdev_parent->dev : NULL);  in of_platform_notify()
786 					__func__, rd->dn);  in of_platform_notify()
788 			return notifier_from_errno(-EINVAL);  in of_platform_notify()
795 		if (!of_node_check_flag(rd->dn, OF_POPULATED))  in of_platform_notify()
799 		pdev = of_find_device_by_node(rd->dn);  in of_platform_notify()
804 		of_platform_device_destroy(&pdev->dev, &children_left);  in of_platform_notify()