1 // SPDX-License-Identifier: GPL-2.0+
16 #include <linux/dma-mapping.h>
26 	{ .compatible = "simple-bus", },
27 	{ .compatible = "simple-mfd", },
30 	{ .compatible = "arm,amba-bus", },
36 	{ .compatible = "operating-points-v2", },
41  * of_find_device_by_node - Find the platform_device associated with a node
42  * @np: Pointer to device tree node
61  * each applicable node.
68  * of_device_make_bus_id - Use the device node data to assign a unique name
69  * @dev: pointer to device structure that is linked to a device tree node
77 	struct device_node *node = dev->of_node;  in of_device_make_bus_id()  local
82 	while (node->parent) {  in of_device_make_bus_id()
87 		reg = of_get_property(node, "reg", NULL);  in of_device_make_bus_id()
88 		if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {  in of_device_make_bus_id()
90 				     addr, node, dev_name(dev));  in of_device_make_bus_id()
96 			     kbasename(node->full_name), dev_name(dev));  in of_device_make_bus_id()
97 		node = node->parent;  in of_device_make_bus_id()
102  * of_device_alloc - Allocate and initialize an of_device
103  * @np: device node to assign to device
132 		dev->num_resources = num_reg + num_irq;  in of_device_alloc()
133 		dev->resource = res;  in of_device_alloc()
143 	dev->dev.of_node = of_node_get(np);  in of_device_alloc()
144 	dev->dev.fwnode = &np->fwnode;  in of_device_alloc()
145 	dev->dev.parent = parent ? : &platform_bus;  in of_device_alloc()
148 		dev_set_name(&dev->dev, "%s", bus_id);  in of_device_alloc()
150 		of_device_make_bus_id(&dev->dev);  in of_device_alloc()
157  * of_platform_device_create_pdata - Alloc, initialize and register an of_device
158  * @np: pointer to node to create device for
182 	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);  in of_platform_device_create_pdata()
183 	if (!dev->dev.dma_mask)  in of_platform_device_create_pdata()
184 		dev->dev.dma_mask = &dev->dev.coherent_dma_mask;  in of_platform_device_create_pdata()
185 	dev->dev.bus = &platform_bus_type;  in of_platform_device_create_pdata()
186 	dev->dev.platform_data = platform_data;  in of_platform_device_create_pdata()
187 	of_msi_configure(&dev->dev, dev->dev.of_node);  in of_platform_device_create_pdata()
202  * of_platform_device_create - Alloc, initialize and register an of_device
203  * @np: pointer to node to create device for
219 static struct amba_device *of_amba_device_create(struct device_node *node,  in of_amba_device_create()  argument
228 	pr_debug("Creating amba device %pOF\n", node);  in of_amba_device_create()
230 	if (!of_device_is_available(node) ||  in of_amba_device_create()
231 	    of_node_test_and_set_flag(node, OF_POPULATED))  in of_amba_device_create()
239 	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);  in of_amba_device_create()
240 	dev->dev.dma_mask = &dev->dev.coherent_dma_mask;  in of_amba_device_create()
243 	dev->dev.of_node = of_node_get(node);  in of_amba_device_create()
244 	dev->dev.fwnode = &node->fwnode;  in of_amba_device_create()
245 	dev->dev.parent = parent ? : &platform_bus;  in of_amba_device_create()
246 	dev->dev.platform_data = platform_data;  in of_amba_device_create()
248 		dev_set_name(&dev->dev, "%s", bus_id);  in of_amba_device_create()
250 		of_device_make_bus_id(&dev->dev);  in of_amba_device_create()
253 	prop = of_get_property(node, "arm,primecell-periphid", NULL);  in of_amba_device_create()
255 		dev->periphid = of_read_ulong(prop, 1);  in of_amba_device_create()
259 		dev->irq[i] = irq_of_parse_and_map(node, i);  in of_amba_device_create()
261 	ret = of_address_to_resource(node, 0, &dev->res);  in of_amba_device_create()
264 		       ret, node);  in of_amba_device_create()
271 		       ret, node);  in of_amba_device_create()
280 	of_node_clear_flag(node, OF_POPULATED);  in of_amba_device_create()
284 static struct amba_device *of_amba_device_create(struct device_node *node,  in of_amba_device_create()  argument
294  * of_dev_lookup() - Given a device node, lookup the preferred Linux name
307 	for (; auxdata->compatible; auxdata++) {  in of_dev_lookup()
308 		if (!of_device_is_compatible(np, auxdata->compatible))  in of_dev_lookup()
312 			if (res.start != auxdata->phys_addr)  in of_dev_lookup()
314 		pr_debug("%pOF: devname=%s\n", np, auxdata->name);  in of_dev_lookup()
323 	for (; auxdata->compatible; auxdata++) {  in of_dev_lookup()
324 		if (!of_device_is_compatible(np, auxdata->compatible))  in of_dev_lookup()
326 		if (!auxdata->phys_addr && !auxdata->name) {  in of_dev_lookup()
336  * of_platform_bus_create() - Create a device for a node and its children.
337  * @bus: device node of the bus to instantiate
360 		pr_debug("%s() - skipping %pOF, no compatible prop\n",  in of_platform_bus_create()
367 		pr_debug("%s() - skipping %pOF node\n", __func__, bus);  in of_platform_bus_create()
372 		pr_debug("%s() - skipping %pOF, already populated\n",  in of_platform_bus_create()
379 		bus_id = auxdata->name;  in of_platform_bus_create()
380 		platform_data = auxdata->platform_data;  in of_platform_bus_create()
398 		rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);  in of_platform_bus_create()
409  * of_platform_bus_probe() - Probe the device-tree for platform buses
410  * @root: parent of the first level to probe or NULL for the root of the tree
414  * Note that children of the provided root are not instantiated as devices
415  * unless the specified root itself matches the bus list and is not NULL.
417 int of_platform_bus_probe(struct device_node *root,  in of_platform_bus_probe()  argument
424 	root = root ? of_node_get(root) : of_find_node_by_path("/");  in of_platform_bus_probe()
425 	if (!root)  in of_platform_bus_probe()
426 		return -EINVAL;  in of_platform_bus_probe()
429 	pr_debug(" starting at: %pOF\n", root);  in of_platform_bus_probe()
432 	if (of_match_node(matches, root)) {  in of_platform_bus_probe()
433 		rc = of_platform_bus_create(root, matches, NULL, parent, false);  in of_platform_bus_probe()
434 	} else for_each_child_of_node(root, child) {  in of_platform_bus_probe()
444 	of_node_put(root);  in of_platform_bus_probe()
450  * of_platform_populate() - Populate platform_devices from device tree data
451  * @root: parent of the first level to probe or NULL for the root of the tree
459  * and it is suitable for creating devices which are children of the root
460  * node (of_platform_bus_probe will only create children of the root which
468 int of_platform_populate(struct device_node *root,  in of_platform_populate()  argument
476 	root = root ? of_node_get(root) : of_find_node_by_path("/");  in of_platform_populate()
477 	if (!root)  in of_platform_populate()
478 		return -EINVAL;  in of_platform_populate()
481 	pr_debug(" starting at: %pOF\n", root);  in of_platform_populate()
484 	for_each_child_of_node(root, child) {  in of_platform_populate()
493 	of_node_set_flag(root, OF_POPULATED_BUS);  in of_platform_populate()
495 	of_node_put(root);  in of_platform_populate()
500 int of_platform_default_populate(struct device_node *root,  in of_platform_default_populate()  argument
504 	return of_platform_populate(root, of_default_bus_match_table, lookup,  in of_platform_default_populate()
511 	{ .compatible = "qcom,rmtfs-mem" },
512 	{ .compatible = "qcom,cmd-db" },
519 	struct device_node *node;  in of_platform_default_populate_init()  local
524 		return -ENODEV;  in of_platform_default_populate_init()
528 	 * platform_devices for every node in /reserved-memory with a  in of_platform_default_populate_init()
531 	for_each_matching_node(node, reserved_mem_matches)  in of_platform_default_populate_init()
532 		of_platform_device_create(node, NULL, NULL);  in of_platform_default_populate_init()
534 	node = of_find_node_by_path("/firmware");  in of_platform_default_populate_init()
535 	if (node) {  in of_platform_default_populate_init()
536 		of_platform_populate(node, NULL, NULL, NULL);  in of_platform_default_populate_init()
537 		of_node_put(node);  in of_platform_default_populate_init()
560 	if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))  in of_platform_device_destroy()
564 	if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))  in of_platform_device_destroy()
567 	of_node_clear_flag(dev->of_node, OF_POPULATED);  in of_platform_device_destroy()
568 	of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);  in of_platform_device_destroy()
570 	if (dev->bus == &platform_bus_type)  in of_platform_device_destroy()
573 	else if (dev->bus == &amba_bustype)  in of_platform_device_destroy()
582  * of_platform_depopulate() - Remove devices populated from device tree
588  * leaving others - eg. manually created - unharmed).
592 	if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {  in of_platform_depopulate()
594 		of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);  in of_platform_depopulate()
605  * devm_of_platform_populate() - Populate platform_devices from device tree data
619 		return -EINVAL;  in devm_of_platform_populate()
624 		return -ENOMEM;  in devm_of_platform_populate()
626 	ret = of_platform_populate(dev->of_node, NULL, NULL, dev);  in devm_of_platform_populate()
651  * devm_of_platform_depopulate() - Remove devices populated from device tree
657  * leaving others - eg. manually created - unharmed).
681 		if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))  in of_platform_notify()
685 		if (of_node_check_flag(rd->dn, OF_POPULATED))  in of_platform_notify()
689 		pdev_parent = of_find_device_by_node(rd->dn->parent);  in of_platform_notify()
690 		pdev = of_platform_device_create(rd->dn, NULL,  in of_platform_notify()
691 				pdev_parent ? &pdev_parent->dev : NULL);  in of_platform_notify()
696 					__func__, rd->dn);  in of_platform_notify()
698 			return notifier_from_errno(-EINVAL);  in of_platform_notify()
705 		if (!of_node_check_flag(rd->dn, OF_POPULATED))  in of_platform_notify()
708 		/* find our device by node */  in of_platform_notify()
709 		pdev = of_find_device_by_node(rd->dn);  in of_platform_notify()
714 		of_platform_device_destroy(&pdev->dev, &children_left);  in of_platform_notify()