1 // SPDX-License-Identifier: GPL-2.0+
15 #include <linux/device.h>
16 #include <linux/dma-mapping.h>
25 	{ .compatible = "simple-bus", },
26 	{ .compatible = "simple-mfd", },
29 	{ .compatible = "arm,amba-bus", },
35 	{ .compatible = "operating-points-v2", },
40  * of_find_device_by_node - Find the platform_device associated with a node
41  * @np: Pointer to device tree node
43  * Takes a reference to the embedded struct device which needs to be dropped
50 	struct device *dev;  in of_find_device_by_node()
59  * The following routines scan a subtree and registers a device for
63  * mechanism for creating devices from device tree nodes.
67  * of_device_make_bus_id - Use the device node data to assign a unique name
68  * @dev: pointer to device structure that is linked to a device tree node
74 static void of_device_make_bus_id(struct device *dev)  in of_device_make_bus_id()
76 	struct device_node *node = dev->of_node;  in of_device_make_bus_id()
82 	while (node->parent) {  in of_device_make_bus_id()
91 					     addr, ffs(mask) - 1, node, dev_name(dev));  in of_device_make_bus_id()
101 			     kbasename(node->full_name), dev_name(dev));  in of_device_make_bus_id()
102 		node = node->parent;  in of_device_make_bus_id()
107  * of_device_alloc - Allocate and initialize an of_device
108  * @np: device node to assign to device
109  * @bus_id: Name to assign to the device.  May be null to use default name.
110  * @parent: Parent device.
114 				  struct device *parent)  in of_device_alloc()
136 		dev->num_resources = num_reg;  in of_device_alloc()
137 		dev->resource = res;  in of_device_alloc()
144 	dev->dev.of_node = of_node_get(np);  in of_device_alloc()
145 	dev->dev.fwnode = &np->fwnode;  in of_device_alloc()
146 	dev->dev.parent = parent ? : &platform_bus;  in of_device_alloc()
149 		dev_set_name(&dev->dev, "%s", bus_id);  in of_device_alloc()
151 		of_device_make_bus_id(&dev->dev);  in of_device_alloc()
158  * of_platform_device_create_pdata - Alloc, initialize and register an of_device
159  * @np: pointer to node to create device for
160  * @bus_id: name to assign device
162  * @parent: Linux device model parent device.
164  * Return: Pointer to created platform device, or NULL if a device was not
171 					struct device *parent)  in of_platform_device_create_pdata()
183 	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);  in of_platform_device_create_pdata()
184 	if (!dev->dev.dma_mask)  in of_platform_device_create_pdata()
185 		dev->dev.dma_mask = &dev->dev.coherent_dma_mask;  in of_platform_device_create_pdata()
186 	dev->dev.bus = &platform_bus_type;  in of_platform_device_create_pdata()
187 	dev->dev.platform_data = platform_data;  in of_platform_device_create_pdata()
188 	of_msi_configure(&dev->dev, dev->dev.of_node);  in of_platform_device_create_pdata()
203  * of_platform_device_create - Alloc, initialize and register an of_device
204  * @np: pointer to node to create device for
205  * @bus_id: name to assign device
206  * @parent: Linux device model parent device.
208  * Return: Pointer to created platform device, or NULL if a device was not
213 					    struct device *parent)  in of_platform_device_create()
223 						 struct device *parent)  in of_amba_device_create()
229 	pr_debug("Creating amba device %pOF\n", node);  in of_amba_device_create()
240 	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);  in of_amba_device_create()
241 	dev->dev.dma_mask = &dev->dev.coherent_dma_mask;  in of_amba_device_create()
243 	/* setup generic device info */  in of_amba_device_create()
244 	dev->dev.of_node = of_node_get(node);  in of_amba_device_create()
245 	dev->dev.fwnode = &node->fwnode;  in of_amba_device_create()
246 	dev->dev.parent = parent ? : &platform_bus;  in of_amba_device_create()
247 	dev->dev.platform_data = platform_data;  in of_amba_device_create()
249 		dev_set_name(&dev->dev, "%s", bus_id);  in of_amba_device_create()
251 		of_device_make_bus_id(&dev->dev);  in of_amba_device_create()
254 	prop = of_get_property(node, "arm,primecell-periphid", NULL);  in of_amba_device_create()
256 		dev->periphid = of_read_ulong(prop, 1);  in of_amba_device_create()
258 	ret = of_address_to_resource(node, 0, &dev->res);  in of_amba_device_create()
284 						 struct device *parent)  in of_amba_device_create()
291  * of_dev_lookup() - Given a device node, lookup the preferred Linux name
304 	for (; auxdata->compatible; auxdata++) {  in of_dev_lookup()
305 		if (!of_device_is_compatible(np, auxdata->compatible))  in of_dev_lookup()
309 			if (res.start != auxdata->phys_addr)  in of_dev_lookup()
311 		pr_debug("%pOF: devname=%s\n", np, auxdata->name);  in of_dev_lookup()
320 	for (; auxdata->compatible; auxdata++) {  in of_dev_lookup()
321 		if (!of_device_is_compatible(np, auxdata->compatible))  in of_dev_lookup()
323 		if (!auxdata->phys_addr && !auxdata->name) {  in of_dev_lookup()
333  * of_platform_bus_create() - Create a device for a node and its children.
334  * @bus: device node of the bus to instantiate
336  * @lookup: auxdata table for matching id and platform_data with device nodes
337  * @parent: parent for new device, or NULL for top level.
346 				  struct device *parent, bool strict)  in of_platform_bus_create()
357 		pr_debug("%s() - skipping %pOF, no compatible prop\n",  in of_platform_bus_create()
364 		pr_debug("%s() - skipping %pOF node\n", __func__, bus);  in of_platform_bus_create()
369 		pr_debug("%s() - skipping %pOF, already populated\n",  in of_platform_bus_create()
376 		bus_id = auxdata->name;  in of_platform_bus_create()
377 		platform_data = auxdata->platform_data;  in of_platform_bus_create()
383 		 * device tree files.  in of_platform_bus_create()
395 		rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);  in of_platform_bus_create()
406  * of_platform_bus_probe() - Probe the device-tree for platform buses
407  * @root: parent of the first level to probe or NULL for the root of the tree
416 			  struct device *parent)  in of_platform_bus_probe()
423 		return -EINVAL;  in of_platform_bus_probe()
447  * of_platform_populate() - Populate platform_devices from device tree data
448  * @root: parent of the first level to probe or NULL for the root of the tree
450  * @lookup: auxdata table for matching id and platform_data with device nodes
453  * Similar to of_platform_bus_probe(), this function walks the device tree
455  * convention of requiring all device nodes to have a 'compatible' property,
468 			struct device *parent)  in of_platform_populate()
475 		return -EINVAL;  in of_platform_populate()
499 				 struct device *parent)  in of_platform_default_populate()
508 	{ .compatible = "qcom,rmtfs-mem" },
509 	{ .compatible = "qcom,cmd-db" },
512 	{ .compatible = "nvmem-rmem" },
513 	{ .compatible = "google,open-dice" },
524 		return -ENODEV;  in of_platform_default_populate_init()
532 		if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL)) {  in of_platform_default_populate_init()
540 			dev = platform_device_alloc("bootx-noscreen", 0);  in of_platform_default_populate_init()
542 				return -ENOMEM;  in of_platform_default_populate_init()
551 		 * For OF framebuffers, first create the device for the boot display,  in of_platform_default_populate_init()
557 			    !of_get_property(node, "linux,boot-display", NULL))  in of_platform_default_populate_init()
559 			dev = of_platform_device_create(node, "of-display", NULL);  in of_platform_default_populate_init()
561 				return -ENOMEM;  in of_platform_default_populate_init()
568 			of_platform_device_create(node, "of-display", NULL);  in of_platform_default_populate_init()
574 		 * platform_devices for every node in /reserved-memory with a  in of_platform_default_populate_init()
586 		node = of_get_compatible_child(of_chosen, "simple-framebuffer");  in of_platform_default_populate_init()
605 int of_platform_device_destroy(struct device *dev, void *data)  in of_platform_device_destroy()
607 	/* Do not touch devices not populated from the device tree */  in of_platform_device_destroy()
608 	if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))  in of_platform_device_destroy()
612 	if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))  in of_platform_device_destroy()
615 	of_node_clear_flag(dev->of_node, OF_POPULATED);  in of_platform_device_destroy()
616 	of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);  in of_platform_device_destroy()
618 	if (dev->bus == &platform_bus_type)  in of_platform_device_destroy()
621 	else if (dev->bus == &amba_bustype)  in of_platform_device_destroy()
630  * of_platform_depopulate() - Remove devices populated from device tree
631  * @parent: device which children will be removed
634  * of the given device (and, recurrently, their children) that have been
635  * created from their respective device tree nodes (and only those,
636  * leaving others - eg. manually created - unharmed).
638 void of_platform_depopulate(struct device *parent)  in of_platform_depopulate()
640 	if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {  in of_platform_depopulate()
642 		of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);  in of_platform_depopulate()
647 static void devm_of_platform_populate_release(struct device *dev, void *res)  in devm_of_platform_populate_release()
649 	of_platform_depopulate(*(struct device **)res);  in devm_of_platform_populate_release()
653  * devm_of_platform_populate() - Populate platform_devices from device tree data
654  * @dev: device that requested to populate from device tree data
657  * of_platform_depopulate() when the device is unbound from the bus.
661 int devm_of_platform_populate(struct device *dev)  in devm_of_platform_populate()
663 	struct device **ptr;  in devm_of_platform_populate()
667 		return -EINVAL;  in devm_of_platform_populate()
672 		return -ENOMEM;  in devm_of_platform_populate()
674 	ret = of_platform_populate(dev->of_node, NULL, NULL, dev);  in devm_of_platform_populate()
686 static int devm_of_platform_match(struct device *dev, void *res, void *data)  in devm_of_platform_match()
688 	struct device **ptr = res;  in devm_of_platform_match()
699  * devm_of_platform_depopulate() - Remove devices populated from device tree
700  * @dev: device that requested to depopulate from device tree data
703  * of the given device (and, recurrently, their children) that have been
704  * created from their respective device tree nodes (and only those,
705  * leaving others - eg. manually created - unharmed).
707 void devm_of_platform_depopulate(struct device *dev)  in devm_of_platform_depopulate()
729 		if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))  in of_platform_notify()
733 		if (of_node_check_flag(rd->dn, OF_POPULATED))  in of_platform_notify()
736 		/* pdev_parent may be NULL when no bus platform device */  in of_platform_notify()
737 		pdev_parent = of_find_device_by_node(rd->dn->parent);  in of_platform_notify()
738 		pdev = of_platform_device_create(rd->dn, NULL,  in of_platform_notify()
739 				pdev_parent ? &pdev_parent->dev : NULL);  in of_platform_notify()
744 					__func__, rd->dn);  in of_platform_notify()
746 			return notifier_from_errno(-EINVAL);  in of_platform_notify()
753 		if (!of_node_check_flag(rd->dn, OF_POPULATED))  in of_platform_notify()
756 		/* find our device by node */  in of_platform_notify()
757 		pdev = of_find_device_by_node(rd->dn);  in of_platform_notify()
762 		of_platform_device_destroy(&pdev->dev, &children_left);  in of_platform_notify()