1 // SPDX-License-Identifier: GPL-2.0+
15 #include <linux/device.h>
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
31  * Takes a reference to the embedded struct device which needs to be dropped
38 	struct device *dev;  in of_find_device_by_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", },
84  * The following routines scan a subtree and registers a device for
88  * mechanism for creating devices from device tree nodes.
92  * of_device_alloc - Allocate and initialize an of_device
93  * @np: device node to assign to device
94  * @bus_id: Name to assign to the device.  May be null to use default name.
95  * @parent: Parent device.
99 				  struct device *parent)  in of_device_alloc()
120 		dev->num_resources = num_reg;  in of_device_alloc()
121 		dev->resource = res;  in of_device_alloc()
128 	/* setup generic device info */  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
144  * @bus_id: name to assign device
146  * @parent: Linux device model parent device.
148  * Return: Pointer to created platform device, or NULL if a device was not
155 					struct device *parent)  in of_platform_device_create_pdata()
159 	pr_debug("create platform device: %pOF\n", np);  in of_platform_device_create_pdata()
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
191  * @bus_id: name to assign device
192  * @parent: Linux device model parent device.
194  * Return: Pointer to created platform device, or NULL if a device was not
199 					    struct device *parent)  in of_platform_device_create()
209 						 struct device *parent)  in of_amba_device_create()
214 	pr_debug("Creating amba device %pOF\n", node);  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()
228 	/* setup generic device info */  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()
266 						 struct device *parent)  in of_amba_device_create()
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
318  * @lookup: auxdata table for matching id and platform_data with device nodes
319  * @parent: parent for new device, or NULL for top level.
328 				  struct device *parent, bool strict)  in of_platform_bus_create()
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()
364 		 * device tree files.  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
395 			  struct device *parent)  in of_platform_bus_probe()
402 		return -EINVAL;  in of_platform_bus_probe()
426  * of_platform_populate() - Populate platform_devices from device tree data
427  * @root: parent of the first level to probe or NULL for the root of the tree
429  * @lookup: auxdata table for matching id and platform_data with device nodes
432  * Similar to of_platform_bus_probe(), this function walks the device tree
434  * convention of requiring all device nodes to have a 'compatible' property,
447 			struct device *parent)  in of_platform_populate()
453 		return -EINVAL;  in of_platform_populate()
475 				 struct device *parent)  in of_platform_default_populate()
478 		{ .compatible = "simple-bus", },  in of_platform_default_populate()
479 		{ .compatible = "simple-mfd", },  in of_platform_default_populate()
482 		{ .compatible = "arm,amba-bus", },  in of_platform_default_populate()
493 	{ .compatible = "qcom,rmtfs-mem" },
494 	{ .compatible = "qcom,cmd-db" },
497 	{ .compatible = "nvmem-rmem" },
498 	{ .compatible = "google,open-dice" },
515 		if (of_property_present(of_chosen, "linux,bootx-noscreen")) {  in of_platform_default_populate_init()
523 			dev = platform_device_alloc("bootx-noscreen", 0);  in of_platform_default_populate_init()
525 				return -ENOMEM;  in of_platform_default_populate_init()
534 		 * For OF framebuffers, first create the device for the boot display,  in of_platform_default_populate_init()
540 			    !of_get_property(node, "linux,boot-display", NULL))  in of_platform_default_populate_init()
542 			dev = of_platform_device_create(node, "of-display", NULL);  in of_platform_default_populate_init()
545 				return -ENOMEM;  in of_platform_default_populate_init()
552 			const char *of_display_format = "of-display.%d";  in of_platform_default_populate_init()
564 		 * platform_devices for every node in /reserved-memory with a  in of_platform_default_populate_init()
576 		node = of_get_compatible_child(of_chosen, "simple-framebuffer");  in of_platform_default_populate_init()
579 			 * Since a "simple-framebuffer" device is already added  in of_platform_default_populate_init()
581 			 * to prevent it from registering another device for the  in of_platform_default_populate_init()
608 int of_platform_device_destroy(struct device *dev, void *data)  in of_platform_device_destroy()
610 	/* Do not touch devices not populated from the device tree */  in of_platform_device_destroy()
611 	if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))  in of_platform_device_destroy()
615 	if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))  in of_platform_device_destroy()
618 	of_node_clear_flag(dev->of_node, OF_POPULATED);  in of_platform_device_destroy()
619 	of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);  in of_platform_device_destroy()
621 	if (dev->bus == &platform_bus_type)  in of_platform_device_destroy()
624 	else if (dev->bus == &amba_bustype)  in of_platform_device_destroy()
633  * of_platform_depopulate() - Remove devices populated from device tree
634  * @parent: device which children will be removed
637  * of the given device (and, recursively, their children) that have been
638  * created from their respective device tree nodes (and only those,
639  * leaving others - eg. manually created - unharmed).
641 void of_platform_depopulate(struct device *parent)  in of_platform_depopulate()
643 	if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {  in of_platform_depopulate()
645 		of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);  in of_platform_depopulate()
650 static void devm_of_platform_populate_release(struct device *dev, void *res)  in devm_of_platform_populate_release()
652 	of_platform_depopulate(*(struct device **)res);  in devm_of_platform_populate_release()
656  * devm_of_platform_populate() - Populate platform_devices from device tree data
657  * @dev: device that requested to populate from device tree data
660  * of_platform_depopulate() when the device is unbound from the bus.
664 int devm_of_platform_populate(struct device *dev)  in devm_of_platform_populate()
666 	struct device **ptr;  in devm_of_platform_populate()
670 		return -EINVAL;  in devm_of_platform_populate()
675 		return -ENOMEM;  in devm_of_platform_populate()
677 	ret = of_platform_populate(dev->of_node, NULL, NULL, dev);  in devm_of_platform_populate()
689 static int devm_of_platform_match(struct device *dev, void *res, void *data)  in devm_of_platform_match()
691 	struct device **ptr = res;  in devm_of_platform_match()
702  * devm_of_platform_depopulate() - Remove devices populated from device tree
703  * @dev: device that requested to depopulate from device tree data
706  * of the given device (and, recursively, their children) that have been
707  * created from their respective device tree nodes (and only those,
708  * leaving others - eg. manually created - unharmed).
710 void devm_of_platform_depopulate(struct device *dev)  in devm_of_platform_depopulate()
732 		parent = rd->dn->parent;  in of_platform_notify()
739 		if (of_node_check_flag(rd->dn, OF_POPULATED))  in of_platform_notify()
743 		 * Clear the flag before adding the device so that fw_devlink  in of_platform_notify()
744 		 * doesn't skip adding consumers to this device.  in of_platform_notify()
746 		rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE;  in of_platform_notify()
747 		/* pdev_parent may be NULL when no bus platform device */  in of_platform_notify()
749 		pdev = of_platform_device_create(rd->dn, NULL,  in of_platform_notify()
750 				pdev_parent ? &pdev_parent->dev : NULL);  in of_platform_notify()
755 					__func__, rd->dn);  in of_platform_notify()
757 			return notifier_from_errno(-EINVAL);  in of_platform_notify()
764 		if (!of_node_check_flag(rd->dn, OF_POPULATED))  in of_platform_notify()
767 		/* find our device by node */  in of_platform_notify()
768 		pdev = of_find_device_by_node(rd->dn);  in of_platform_notify()
773 		of_platform_device_destroy(&pdev->dev, &children_left);  in of_platform_notify()