1 // SPDX-License-Identifier: GPL-2.0+
16 #include <linux/dma-mapping.h>
28  * of_find_device_by_node - Find the platform_device associated with a node
29  * @np: Pointer to device tree node
47 	BUG_ON(ofdev->dev.of_node == NULL);  in of_device_add()
51 	ofdev->name = dev_name(&ofdev->dev);  in of_device_add()
52 	ofdev->id = PLATFORM_DEVID_NONE;  in of_device_add()
55 	 * If this device has not binding numa node in devicetree, that is  in of_device_add()
57 	 * device is on the same node as the parent.  in of_device_add()
59 	set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));  in of_device_add()
61 	return device_add(&ofdev->dev);  in of_device_add()
66 	device_initialize(&pdev->dev);  in of_device_register()
73 	device_unregister(&ofdev->dev);  in of_device_unregister()
79 	{ .compatible = "operating-points-v2", },
85  * each applicable node.
92  * of_device_alloc - Allocate and initialize an of_device
93  * @np: device node to assign to device
120 		dev->num_resources = num_reg;  in of_device_alloc()
121 		dev->resource = res;  in of_device_alloc()
129 	device_set_node(&dev->dev, of_fwnode_handle(of_node_get(np)));  in of_device_alloc()
130 	dev->dev.parent = parent ? : &platform_bus;  in of_device_alloc()
133 		dev_set_name(&dev->dev, "%s", bus_id);  in of_device_alloc()
135 		of_device_make_bus_id(&dev->dev);  in of_device_alloc()
142  * of_platform_device_create_pdata - Alloc, initialize and register an of_device
143  * @np: pointer to node to create device for
169 	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);  in of_platform_device_create_pdata()
170 	if (!dev->dev.dma_mask)  in of_platform_device_create_pdata()
171 		dev->dev.dma_mask = &dev->dev.coherent_dma_mask;  in of_platform_device_create_pdata()
172 	dev->dev.bus = &platform_bus_type;  in of_platform_device_create_pdata()
173 	dev->dev.platform_data = platform_data;  in of_platform_device_create_pdata()
174 	of_msi_configure(&dev->dev, dev->dev.of_node);  in of_platform_device_create_pdata()
189  * of_platform_device_create - Alloc, initialize and register an of_device
190  * @np: pointer to node to create device for
206 static struct amba_device *of_amba_device_create(struct device_node *node,  in of_amba_device_create()  argument
214 	pr_debug("Creating amba device %pOF\n", node);  in of_amba_device_create()
216 	if (!of_device_is_available(node) ||  in of_amba_device_create()
217 	    of_node_test_and_set_flag(node, OF_POPULATED))  in of_amba_device_create()
225 	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);  in of_amba_device_create()
226 	dev->dev.dma_mask = &dev->dev.coherent_dma_mask;  in of_amba_device_create()
229 	device_set_node(&dev->dev, of_fwnode_handle(node));  in of_amba_device_create()
230 	dev->dev.parent = parent ? : &platform_bus;  in of_amba_device_create()
231 	dev->dev.platform_data = platform_data;  in of_amba_device_create()
233 		dev_set_name(&dev->dev, "%s", bus_id);  in of_amba_device_create()
235 		of_device_make_bus_id(&dev->dev);  in of_amba_device_create()
238 	of_property_read_u32(node, "arm,primecell-periphid", &dev->periphid);  in of_amba_device_create()
240 	ret = of_address_to_resource(node, 0, &dev->res);  in of_amba_device_create()
243 		       ret, node);  in of_amba_device_create()
250 		       ret, node);  in of_amba_device_create()
259 	of_node_clear_flag(node, OF_POPULATED);  in of_amba_device_create()
263 static struct amba_device *of_amba_device_create(struct device_node *node,  in of_amba_device_create()  argument
273  * of_dev_lookup() - Given a device node, lookup the preferred Linux name
286 	for (; auxdata->compatible; auxdata++) {  in of_dev_lookup()
287 		if (!of_device_is_compatible(np, auxdata->compatible))  in of_dev_lookup()
291 			if (res.start != auxdata->phys_addr)  in of_dev_lookup()
293 		pr_debug("%pOF: devname=%s\n", np, auxdata->name);  in of_dev_lookup()
302 	for (; auxdata->compatible; auxdata++) {  in of_dev_lookup()
303 		if (!of_device_is_compatible(np, auxdata->compatible))  in of_dev_lookup()
305 		if (!auxdata->phys_addr && !auxdata->name) {  in of_dev_lookup()
315  * of_platform_bus_create() - Create a device for a node and its children.
316  * @bus: device node of the bus to instantiate
338 		pr_debug("%s() - skipping %pOF, no compatible prop\n",  in of_platform_bus_create()
345 		pr_debug("%s() - skipping %pOF node\n", __func__, bus);  in of_platform_bus_create()
350 		pr_debug("%s() - skipping %pOF, already populated\n",  in of_platform_bus_create()
357 		bus_id = auxdata->name;  in of_platform_bus_create()
358 		platform_data = auxdata->platform_data;  in of_platform_bus_create()
376 		rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);  in of_platform_bus_create()
385  * of_platform_bus_probe() - Probe the device-tree for platform buses
386  * @root: parent of the first level to probe or NULL for the root of the tree
390  * Note that children of the provided root are not instantiated as devices
391  * unless the specified root itself matches the bus list and is not NULL.
393 int of_platform_bus_probe(struct device_node *root,  in of_platform_bus_probe()  argument
399 	root = root ? of_node_get(root) : of_find_node_by_path("/");  in of_platform_bus_probe()
400 	if (!root)  in of_platform_bus_probe()
401 		return -EINVAL;  in of_platform_bus_probe()
404 	pr_debug(" starting at: %pOF\n", root);  in of_platform_bus_probe()
407 	if (of_match_node(matches, root)) {  in of_platform_bus_probe()
408 		rc = of_platform_bus_create(root, matches, NULL, parent, false);  in of_platform_bus_probe()
410 		for_each_child_of_node_scoped(root, child) {  in of_platform_bus_probe()
419 	of_node_put(root);  in of_platform_bus_probe()
425  * of_platform_populate() - Populate platform_devices from device tree data
426  * @root: parent of the first level to probe or NULL for the root of the tree
434  * and it is suitable for creating devices which are children of the root
435  * node (of_platform_bus_probe will only create children of the root which
443 int of_platform_populate(struct device_node *root,  in of_platform_populate()  argument
450 	root = root ? of_node_get(root) : of_find_node_by_path("/");  in of_platform_populate()
451 	if (!root)  in of_platform_populate()
452 		return -EINVAL;  in of_platform_populate()
455 	pr_debug(" starting at: %pOF\n", root);  in of_platform_populate()
458 	for_each_child_of_node_scoped(root, child) {  in of_platform_populate()
465 	of_node_set_flag(root, OF_POPULATED_BUS);  in of_platform_populate()
467 	of_node_put(root);  in of_platform_populate()
472 int of_platform_default_populate(struct device_node *root,  in of_platform_default_populate()  argument
477 		{ .compatible = "simple-bus", },  in of_platform_default_populate()
478 		{ .compatible = "simple-mfd", },  in of_platform_default_populate()
481 		{ .compatible = "arm,amba-bus", },  in of_platform_default_populate()
486 	return of_platform_populate(root, match_table, lookup, parent);  in of_platform_default_populate()
492 	{ .compatible = "qcom,rmtfs-mem" },
493 	{ .compatible = "qcom,cmd-db" },
496 	{ .compatible = "nvmem-rmem" },
497 	{ .compatible = "google,open-dice" },
503 	struct device_node *node;  in of_platform_default_populate_init()  local
513 		/* Check if we have a MacOS display without a node spec */  in of_platform_default_populate_init()
514 		if (of_property_present(of_chosen, "linux,bootx-noscreen")) {  in of_platform_default_populate_init()
516 			 * The old code tried to work out which node was the MacOS  in of_platform_default_populate_init()
518 			 * lack of a node spec only happens with old BootX versions  in of_platform_default_populate_init()
522 			dev = platform_device_alloc("bootx-noscreen", 0);  in of_platform_default_populate_init()
524 				return -ENOMEM;  in of_platform_default_populate_init()
537 		for_each_node_by_type(node, "display") {  in of_platform_default_populate_init()
538 			if (!of_property_read_bool(node, "linux,opened") ||  in of_platform_default_populate_init()
539 			    !of_property_read_bool(node, "linux,boot-display"))  in of_platform_default_populate_init()
541 			dev = of_platform_device_create(node, "of-display", NULL);  in of_platform_default_populate_init()
542 			of_node_put(node);  in of_platform_default_populate_init()
544 				return -ENOMEM;  in of_platform_default_populate_init()
545 			boot_display = node;  in of_platform_default_populate_init()
549 		for_each_node_by_type(node, "display") {  in of_platform_default_populate_init()
551 			const char *of_display_format = "of-display.%d";  in of_platform_default_populate_init()
553 			if (!of_property_read_bool(node, "linux,opened") || node == boot_display)  in of_platform_default_populate_init()
557 				of_platform_device_create(node, buf, NULL);  in of_platform_default_populate_init()
563 		 * platform_devices for every node in /reserved-memory with a  in of_platform_default_populate_init()
566 		for_each_matching_node(node, reserved_mem_matches)  in of_platform_default_populate_init()
567 			of_platform_device_create(node, NULL, NULL);  in of_platform_default_populate_init()
569 		node = of_find_node_by_path("/firmware");  in of_platform_default_populate_init()
570 		if (node) {  in of_platform_default_populate_init()
571 			of_platform_default_populate(node, NULL, NULL);  in of_platform_default_populate_init()
572 			of_node_put(node);  in of_platform_default_populate_init()
575 		node = of_get_compatible_child(of_chosen, "simple-framebuffer");  in of_platform_default_populate_init()
576 		if (node) {  in of_platform_default_populate_init()
578 			 * Since a "simple-framebuffer" device is already added  in of_platform_default_populate_init()
588 			of_platform_device_create(node, NULL, NULL);  in of_platform_default_populate_init()
589 			of_node_put(node);  in of_platform_default_populate_init()
610 	if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))  in of_platform_device_destroy()
614 	if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))  in of_platform_device_destroy()
617 	of_node_clear_flag(dev->of_node, OF_POPULATED);  in of_platform_device_destroy()
618 	of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);  in of_platform_device_destroy()
620 	if (dev->bus == &platform_bus_type)  in of_platform_device_destroy()
623 	else if (dev->bus == &amba_bustype)  in of_platform_device_destroy()
632  * of_platform_depopulate() - Remove devices populated from device tree
638  * leaving others - eg. manually created - unharmed).
642 	if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {  in of_platform_depopulate()
644 		of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);  in of_platform_depopulate()
655  * devm_of_platform_populate() - Populate platform_devices from device tree data
669 		return -EINVAL;  in devm_of_platform_populate()
674 		return -ENOMEM;  in devm_of_platform_populate()
676 	ret = of_platform_populate(dev->of_node, NULL, NULL, dev);  in devm_of_platform_populate()
701  * devm_of_platform_depopulate() - Remove devices populated from device tree
707  * leaving others - eg. manually created - unharmed).
731 		parent = rd->dn->parent;  in of_platform_notify()
732 		/* verify that the parent is a bus (or the root node) */  in of_platform_notify()
738 		if (of_node_check_flag(rd->dn, OF_POPULATED))  in of_platform_notify()
745 		rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE;  in of_platform_notify()
748 		pdev = of_platform_device_create(rd->dn, NULL,  in of_platform_notify()
749 				pdev_parent ? &pdev_parent->dev : NULL);  in of_platform_notify()
754 					__func__, rd->dn);  in of_platform_notify()
756 			return notifier_from_errno(-EINVAL);  in of_platform_notify()
763 		if (!of_node_check_flag(rd->dn, OF_POPULATED))  in of_platform_notify()
766 		/* find our device by node */  in of_platform_notify()
767 		pdev = of_find_device_by_node(rd->dn);  in of_platform_notify()
772 		of_platform_device_destroy(&pdev->dev, &children_left);  in of_platform_notify()