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()
81 	while (node->parent) {  in of_device_make_bus_id()
95 			     kbasename(node->full_name), dev_name(dev));  in of_device_make_bus_id()
96 		node = node->parent;  in of_device_make_bus_id()
101  * of_device_alloc - Allocate and initialize an of_device
102  * @np: device node to assign to device
103  * @bus_id: Name to assign to the device.  May be null to use default name.
104  * @parent: Parent device.
108 				  struct device *parent)  in of_device_alloc()
131 		dev->num_resources = num_reg + num_irq;  in of_device_alloc()
132 		dev->resource = res;  in of_device_alloc()
142 	dev->dev.of_node = of_node_get(np);  in of_device_alloc()
143 	dev->dev.fwnode = &np->fwnode;  in of_device_alloc()
144 	dev->dev.parent = parent ? : &platform_bus;  in of_device_alloc()
147 		dev_set_name(&dev->dev, "%s", bus_id);  in of_device_alloc()
149 		of_device_make_bus_id(&dev->dev);  in of_device_alloc()
156  * of_platform_device_create_pdata - Alloc, initialize and register an of_device
157  * @np: pointer to node to create device for
158  * @bus_id: name to assign device
160  * @parent: Linux device model parent device.
162  * Return: Pointer to created platform device, or NULL if a device was not
169 					struct device *parent)  in of_platform_device_create_pdata()
181 	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);  in of_platform_device_create_pdata()
182 	if (!dev->dev.dma_mask)  in of_platform_device_create_pdata()
183 		dev->dev.dma_mask = &dev->dev.coherent_dma_mask;  in of_platform_device_create_pdata()
184 	dev->dev.bus = &platform_bus_type;  in of_platform_device_create_pdata()
185 	dev->dev.platform_data = platform_data;  in of_platform_device_create_pdata()
186 	of_msi_configure(&dev->dev, dev->dev.of_node);  in of_platform_device_create_pdata()
201  * of_platform_device_create - Alloc, initialize and register an of_device
202  * @np: pointer to node to create device for
203  * @bus_id: name to assign device
204  * @parent: Linux device model parent device.
206  * Return: Pointer to created platform device, or NULL if a device was not
211 					    struct device *parent)  in of_platform_device_create()
221 						 struct device *parent)  in of_amba_device_create()
227 	pr_debug("Creating amba device %pOF\n", node);  in of_amba_device_create()
238 	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);  in of_amba_device_create()
239 	dev->dev.dma_mask = &dev->dev.coherent_dma_mask;  in of_amba_device_create()
241 	/* setup generic device info */  in of_amba_device_create()
242 	dev->dev.of_node = of_node_get(node);  in of_amba_device_create()
243 	dev->dev.fwnode = &node->fwnode;  in of_amba_device_create()
244 	dev->dev.parent = parent ? : &platform_bus;  in of_amba_device_create()
245 	dev->dev.platform_data = platform_data;  in of_amba_device_create()
247 		dev_set_name(&dev->dev, "%s", bus_id);  in of_amba_device_create()
249 		of_device_make_bus_id(&dev->dev);  in of_amba_device_create()
252 	prop = of_get_property(node, "arm,primecell-periphid", NULL);  in of_amba_device_create()
254 		dev->periphid = of_read_ulong(prop, 1);  in of_amba_device_create()
258 		dev->irq[i] = irq_of_parse_and_map(node, i);  in of_amba_device_create()
260 	ret = of_address_to_resource(node, 0, &dev->res);  in of_amba_device_create()
286 						 struct device *parent)  in of_amba_device_create()
293  * of_dev_lookup() - Given a device node, lookup the preferred Linux name
306 	for (; auxdata->compatible; auxdata++) {  in of_dev_lookup()
307 		if (!of_device_is_compatible(np, auxdata->compatible))  in of_dev_lookup()
311 			if (res.start != auxdata->phys_addr)  in of_dev_lookup()
313 		pr_debug("%pOF: devname=%s\n", np, auxdata->name);  in of_dev_lookup()
322 	for (; auxdata->compatible; auxdata++) {  in of_dev_lookup()
323 		if (!of_device_is_compatible(np, auxdata->compatible))  in of_dev_lookup()
325 		if (!auxdata->phys_addr && !auxdata->name) {  in of_dev_lookup()
335  * of_platform_bus_create() - Create a device for a node and its children.
336  * @bus: device node of the bus to instantiate
338  * @lookup: auxdata table for matching id and platform_data with device nodes
339  * @parent: parent for new device, or NULL for top level.
348 				  struct device *parent, bool strict)  in of_platform_bus_create()
359 		pr_debug("%s() - skipping %pOF, no compatible prop\n",  in of_platform_bus_create()
366 		pr_debug("%s() - skipping %pOF node\n", __func__, bus);  in of_platform_bus_create()
371 		pr_debug("%s() - skipping %pOF, already populated\n",  in of_platform_bus_create()
378 		bus_id = auxdata->name;  in of_platform_bus_create()
379 		platform_data = auxdata->platform_data;  in of_platform_bus_create()
385 		 * device tree files.  in of_platform_bus_create()
397 		rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);  in of_platform_bus_create()
408  * of_platform_bus_probe() - Probe the device-tree for platform buses
409  * @root: parent of the first level to probe or NULL for the root of the tree
418 			  struct device *parent)  in of_platform_bus_probe()
425 		return -EINVAL;  in of_platform_bus_probe()
449  * of_platform_populate() - Populate platform_devices from device tree data
450  * @root: parent of the first level to probe or NULL for the root of the tree
452  * @lookup: auxdata table for matching id and platform_data with device nodes
455  * Similar to of_platform_bus_probe(), this function walks the device tree
457  * convention of requiring all device nodes to have a 'compatible' property,
470 			struct device *parent)  in of_platform_populate()
477 		return -EINVAL;  in of_platform_populate()
501 				 struct device *parent)  in of_platform_default_populate()
510 	{ .compatible = "qcom,rmtfs-mem" },
511 	{ .compatible = "qcom,cmd-db" },
513 	{ .compatible = "nvmem-rmem" },
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()
555 int of_platform_device_destroy(struct device *dev, void *data)  in of_platform_device_destroy()
557 	/* Do not touch devices not populated from the device tree */  in of_platform_device_destroy()
558 	if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))  in of_platform_device_destroy()
562 	if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))  in of_platform_device_destroy()
565 	of_node_clear_flag(dev->of_node, OF_POPULATED);  in of_platform_device_destroy()
566 	of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);  in of_platform_device_destroy()
568 	if (dev->bus == &platform_bus_type)  in of_platform_device_destroy()
571 	else if (dev->bus == &amba_bustype)  in of_platform_device_destroy()
580  * of_platform_depopulate() - Remove devices populated from device tree
581  * @parent: device which children will be removed
584  * of the given device (and, recurrently, their children) that have been
585  * created from their respective device tree nodes (and only those,
586  * leaving others - eg. manually created - unharmed).
588 void of_platform_depopulate(struct device *parent)  in of_platform_depopulate()
590 	if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {  in of_platform_depopulate()
592 		of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);  in of_platform_depopulate()
597 static void devm_of_platform_populate_release(struct device *dev, void *res)  in devm_of_platform_populate_release()
599 	of_platform_depopulate(*(struct device **)res);  in devm_of_platform_populate_release()
603  * devm_of_platform_populate() - Populate platform_devices from device tree data
604  * @dev: device that requested to populate from device tree data
607  * of_platform_depopulate() when the device is unbound from the bus.
611 int devm_of_platform_populate(struct device *dev)  in devm_of_platform_populate()
613 	struct device **ptr;  in devm_of_platform_populate()
617 		return -EINVAL;  in devm_of_platform_populate()
622 		return -ENOMEM;  in devm_of_platform_populate()
624 	ret = of_platform_populate(dev->of_node, NULL, NULL, dev);  in devm_of_platform_populate()
636 static int devm_of_platform_match(struct device *dev, void *res, void *data)  in devm_of_platform_match()
638 	struct device **ptr = res;  in devm_of_platform_match()
649  * devm_of_platform_depopulate() - Remove devices populated from device tree
650  * @dev: device that requested to depopulate from device tree data
653  * of the given device (and, recurrently, their children) that have been
654  * created from their respective device tree nodes (and only those,
655  * leaving others - eg. manually created - unharmed).
657 void devm_of_platform_depopulate(struct device *dev)  in devm_of_platform_depopulate()
679 		if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))  in of_platform_notify()
683 		if (of_node_check_flag(rd->dn, OF_POPULATED))  in of_platform_notify()
686 		/* pdev_parent may be NULL when no bus platform device */  in of_platform_notify()
687 		pdev_parent = of_find_device_by_node(rd->dn->parent);  in of_platform_notify()
688 		pdev = of_platform_device_create(rd->dn, NULL,  in of_platform_notify()
689 				pdev_parent ? &pdev_parent->dev : NULL);  in of_platform_notify()
694 					__func__, rd->dn);  in of_platform_notify()
696 			return notifier_from_errno(-EINVAL);  in of_platform_notify()
703 		if (!of_node_check_flag(rd->dn, OF_POPULATED))  in of_platform_notify()
706 		/* find our device by node */  in of_platform_notify()
707 		pdev = of_find_device_by_node(rd->dn);  in of_platform_notify()
712 		of_platform_device_destroy(&pdev->dev, &children_left);  in of_platform_notify()