// SPDX-License-Identifier: GPL-2.0+/* * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. * <benh@kernel.crashing.org> * and Arnd Bergmann, IBM Corp. * Merged from powerpc/kernel/of_platform.c and * sparc{,64}/kernel/of_device.c by Stephen Rothwell */ #define pr_fmt(fmt) "OF: " fmt #include <linux/errno.h>#include <linux/module.h>#include <linux/amba/bus.h>#include <linux/device.h>#include <linux/dma-mapping.h>#include <linux/slab.h>#include <linux/of_address.h>#include <linux/of_device.h>#include <linux/of_irq.h>#include <linux/of_platform.h>#include <linux/platform_device.h>#include <linux/sysfb.h> #include "of_private.h" const struct of_device_id of_default_bus_match_table[] = { { .compatible = "simple-bus", }, { .compatible = "simple-mfd", }, { .compatible = "isa", },#ifdef CONFIG_ARM_AMBA { .compatible = "arm,amba-bus", },#endif /* CONFIG_ARM_AMBA */ {} /* Empty terminated list */}; /** * of_find_device_by_node - Find the platform_device associated with a node * @np: Pointer to device tree node * * Takes a reference to the embedded struct device which needs to be dropped * after use. * * Return: platform_device pointer, or NULL if not found */struct platform_device *of_find_device_by_node(struct device_node *np){ struct device *dev; dev = bus_find_device_by_of_node(&platform_bus_type, np); return dev ? to_platform_device(dev) : NULL;}EXPORT_SYMBOL(of_find_device_by_node); int of_device_add(struct platform_device *ofdev){ BUG_ON(ofdev->dev.of_node == NULL); /* name and id have to be set so that the platform bus doesn't get * confused on matching */ ofdev->name = dev_name(&ofdev->dev); ofdev->id = PLATFORM_DEVID_NONE; /* * If this device has not binding numa node in devicetree, that is * of_node_to_nid returns NUMA_NO_NODE. device_add will assume that this * device is on the same node as the parent. */ set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node)); return device_add(&ofdev->dev);} int of_device_register(struct platform_device *pdev){ device_initialize(&pdev->dev); return of_device_add(pdev);}EXPORT_SYMBOL(of_device_register); void of_device_unregister(struct platform_device *ofdev){ device_unregister(&ofdev->dev);}EXPORT_SYMBOL(of_device_unregister); #ifdef CONFIG_OF_ADDRESSstatic const struct of_device_id of_skipped_node_table[] = { { .compatible = "operating-points-v2", }, {} /* Empty terminated list */}; /* * The following routines scan a subtree and registers a device for * each applicable node. * * Note: sparc doesn't use these routines because it has a different * mechanism for creating devices from device tree nodes. */ /** * of_device_alloc - Allocate and initialize an of_device * @np: device node to assign to device * @bus_id: Name to assign to the device. May be null to use default name. * @parent: Parent device. */struct platform_device *of_device_alloc(struct device_node *np, const char *bus_id, struct device *parent){ struct platform_device *dev; int rc, i, num_reg = 0; struct resource *res; dev = platform_device_alloc("", PLATFORM_DEVID_NONE); if (!dev) return NULL; /* count the io resources */ num_reg = of_address_count(np); /* Populate the resource table */ if (num_reg) { res = kcalloc(num_reg, sizeof(*res), GFP_KERNEL); if (!res) { platform_device_put(dev); return NULL; } dev->num_resources = num_reg; dev->resource = res; for (i = 0; i < num_reg; i++, res++) { rc = of_address_to_resource(np, i, res); WARN_ON(rc); } } /* setup generic device info */ device_set_node(&dev->dev, of_fwnode_handle(of_node_get(np))); dev->dev.parent = parent ? : &platform_bus; if (bus_id) dev_set_name(&dev->dev, "%s", bus_id); else of_device_make_bus_id(&dev->dev); return dev;}EXPORT_SYMBOL(of_device_alloc); /** * of_platform_device_create_pdata - Alloc, initialize and register an of_device * @np: pointer to node to create device for * @bus_id: name to assign device * @platform_data: pointer to populate platform_data pointer with * @parent: Linux device model parent device. * * Return: Pointer to created platform device, or NULL if a device was not * registered. Unavailable devices will not get registered. */static struct platform_device *of_platform_device_create_pdata( struct device_node *np, const char *bus_id, void *platform_data, struct device *parent){ struct platform_device *dev; pr_debug("create platform device: %pOF\n", np); if (!of_device_is_available(np) || of_node_test_and_set_flag(np, OF_POPULATED)) return NULL; dev = of_device_alloc(np, bus_id, parent); if (!dev) goto err_clear_flag; dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); if (!dev->dev.dma_mask) dev->dev.dma_mask = &dev->dev.coherent_dma_mask; dev->dev.bus = &platform_bus_type; dev->dev.platform_data = platform_data; of_msi_configure(&dev->dev, dev->dev.of_node); if (of_device_add(dev) != 0) { platform_device_put(dev); goto err_clear_flag; } return dev; err_clear_flag: of_node_clear_flag(np, OF_POPULATED); return NULL;} /** * of_platform_device_create - Alloc, initialize and register an of_device * @np: pointer to node to create device for * @bus_id: name to assign device * @parent: Linux device model parent device. * * Return: Pointer to created platform device, or NULL if a device was not * registered. Unavailable devices will not get registered. */struct platform_device *of_platform_device_create(struct device_node *np, const char *bus_id, struct device *parent){ return of_platform_device_create_pdata(np, bus_id, NULL, parent);}EXPORT_SYMBOL(of_platform_device_create); #ifdef CONFIG_ARM_AMBAstatic struct amba_device *of_amba_device_create(struct device_node *node, const char *bus_id, void *platform_data, struct device *parent){ struct amba_device *dev; int ret; pr_debug("Creating amba device %pOF\n", node); if (!of_device_is_available(node) || of_node_test_and_set_flag(node, OF_POPULATED)) return NULL; dev = amba_device_alloc(NULL, 0, 0); if (!dev) goto err_clear_flag; /* AMBA devices only support a single DMA mask */ dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); dev->dev.dma_mask = &dev->dev.coherent_dma_mask; /* setup generic device info */ device_set_node(&dev->dev, of_fwnode_handle(node)); dev->dev.parent = parent ? : &platform_bus; dev->dev.platform_data = platform_data; if (bus_id) dev_set_name(&dev->dev, "%s", bus_id); else of_device_make_bus_id(&dev->dev); /* Allow the HW Peripheral ID to be overridden */ of_property_read_u32(node, "arm,primecell-periphid", &dev->periphid); ret = of_address_to_resource(node, 0, &dev->res); if (ret) { pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n", ret, node); goto err_free; } ret = amba_device_add(dev, &iomem_resource); if (ret) { pr_err("amba_device_add() failed (%d) for %pOF\n", ret, node); goto err_free; } return dev; err_free: amba_device_put(dev);err_clear_flag: of_node_clear_flag(node, OF_POPULATED); return NULL;}#else /* CONFIG_ARM_AMBA */static struct amba_device *of_amba_device_create(struct device_node *node, const char *bus_id, void *platform_data, struct device *parent){ return NULL;}#endif /* CONFIG_ARM_AMBA */ /* * of_dev_lookup() - Given a device node, lookup the preferred Linux name */static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, struct device_node *np){ const struct of_dev_auxdata *auxdata; struct resource res; int compatible = 0; if (!lookup) return NULL; auxdata = lookup; for (; auxdata->compatible; auxdata++) { if (!of_device_is_compatible(np, auxdata->compatible)) continue; compatible++; if (!of_address_to_resource(np, 0, &res)) if (res.start != auxdata->phys_addr) continue; pr_debug("%pOF: devname=%s\n", np, auxdata->name); return auxdata; } if (!compatible) return NULL; /* Try compatible match if no phys_addr and name are specified */ auxdata = lookup; for (; auxdata->compatible; auxdata++) { if (!of_device_is_compatible(np, auxdata->compatible)) continue; if (!auxdata->phys_addr && !auxdata->name) { pr_debug("%pOF: compatible match\n", np); return auxdata; } } return NULL;} /** * of_platform_bus_create() - Create a device for a node and its children. * @bus: device node of the bus to instantiate * @matches: match table for bus nodes * @lookup: auxdata table for matching id and platform_data with device nodes * @parent: parent for new device, or NULL for top level. * @strict: require compatible property * * Creates a platform_device for the provided device_node, and optionally * recursively create devices for all the child nodes. */static int of_platform_bus_create(struct device_node *bus, const struct of_device_id *matches, const struct of_dev_auxdata *lookup, struct device *parent, bool strict){ const struct of_dev_auxdata *auxdata; struct platform_device *dev; const char *bus_id = NULL; void *platform_data = NULL; int rc = 0; /* Make sure it has a compatible property */ if (strict && (!of_get_property(bus, "compatible", NULL))) { pr_debug("%s() - skipping %pOF, no compatible prop\n", __func__, bus); return 0; } /* Skip nodes for which we don't want to create devices */ if (unlikely(of_match_node(of_skipped_node_table, bus))) { pr_debug("%s() - skipping %pOF node\n", __func__, bus); return 0; } if (of_node_check_flag(bus, OF_POPULATED_BUS)) { pr_debug("%s() - skipping %pOF, already populated\n", __func__, bus); return 0; } auxdata = of_dev_lookup(lookup, bus); if (auxdata) { bus_id = auxdata->name; platform_data = auxdata->platform_data; } if (of_device_is_compatible(bus, "arm,primecell")) { /* * Don't return an error here to keep compatibility with older * device tree files. */ of_amba_device_create(bus, bus_id, platform_data, parent); return 0; } dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); if (!dev || !of_match_node(matches, bus)) return 0; for_each_child_of_node_scoped(bus, child) { pr_debug(" create child: %pOF\n", child); rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); if (rc) break; } of_node_set_flag(bus, OF_POPULATED_BUS); return rc;} /** * of_platform_bus_probe() - Probe the device-tree for platform buses * @root: parent of the first level to probe or NULL for the root of the tree * @matches: match table for bus nodes * @parent: parent to hook devices from, NULL for toplevel * * Note that children of the provided root are not instantiated as devices * unless the specified root itself matches the bus list and is not NULL. */int of_platform_bus_probe(struct device_node *root, const struct of_device_id *matches, struct device *parent){ struct device_node *child; int rc = 0; root = root ? of_node_get(root) : of_find_node_by_path("/"); if (!root) return -EINVAL; pr_debug("%s()\n", __func__); pr_debug(" starting at: %pOF\n", root); /* Do a self check of bus type, if there's a match, create children */ if (of_match_node(matches, root)) { rc = of_platform_bus_create(root, matches, NULL, parent, false); } else for_each_child_of_node(root, child) { if (!of_match_node(matches, child)) continue; rc = of_platform_bus_create(child, matches, NULL, parent, false); if (rc) { of_node_put(child); break; } } of_node_put(root); return rc;}EXPORT_SYMBOL(of_platform_bus_probe); /** * of_platform_populate() - Populate platform_devices from device tree data * @root: parent of the first level to probe or NULL for the root of the tree * @matches: match table, NULL to use the default * @lookup: auxdata table for matching id and platform_data with device nodes * @parent: parent to hook devices from, NULL for toplevel * * Similar to of_platform_bus_probe(), this function walks the device tree * and creates devices from nodes. It differs in that it follows the modern * convention of requiring all device nodes to have a 'compatible' property, * and it is suitable for creating devices which are children of the root * node (of_platform_bus_probe will only create children of the root which * are selected by the @matches argument). * * New board support should be using this function instead of * of_platform_bus_probe(). * * Return: 0 on success, < 0 on failure. */int of_platform_populate(struct device_node *root, const struct of_device_id *matches, const struct of_dev_auxdata *lookup, struct device *parent){ int rc = 0; root = root ? of_node_get(root) : of_find_node_by_path("/"); if (!root) return -EINVAL; pr_debug("%s()\n", __func__); pr_debug(" starting at: %pOF\n", root); device_links_supplier_sync_state_pause(); for_each_child_of_node_scoped(root, child) { rc = of_platform_bus_create(child, matches, lookup, parent, true); if (rc) break; } device_links_supplier_sync_state_resume(); of_node_set_flag(root, OF_POPULATED_BUS); of_node_put(root); return rc;}EXPORT_SYMBOL_GPL(of_platform_populate); int of_platform_default_populate(struct device_node *root, const struct of_dev_auxdata *lookup, struct device *parent){ return of_platform_populate(root, of_default_bus_match_table, lookup, parent);}EXPORT_SYMBOL_GPL(of_platform_default_populate); static const struct of_device_id reserved_mem_matches[] = { { .compatible = "phram" }, { .compatible = "qcom,rmtfs-mem" }, { .compatible = "qcom,cmd-db" }, { .compatible = "qcom,smem" }, { .compatible = "ramoops" }, { .compatible = "nvmem-rmem" }, { .compatible = "google,open-dice" }, {}Lines 1–500 of 794. Load more
// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. * <benh@kernel.crashing.org> * and Arnd Bergmann, IBM Corp. * Merged from powerpc/kernel/of_platform.c and * sparc{,64}/kernel/of_device.c by Stephen Rothwell */ #define pr_fmt(fmt) "OF: " fmt #include <linux/errno.h> #include <linux/module.h> #include <linux/amba/bus.h> #include <linux/device.h> #include <linux/dma-mapping.h> #include <linux/slab.h> #include <linux/of_address.h> #include <linux/of_device.h> #include <linux/of_irq.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/sysfb.h> #include "of_private.h" const struct of_device_id of_default_bus_match_table[] = { { .compatible = "simple-bus", }, { .compatible = "simple-mfd", }, { .compatible = "isa", }, #ifdef CONFIG_ARM_AMBA { .compatible = "arm,amba-bus", }, #endif /* CONFIG_ARM_AMBA */ {} /* Empty terminated list */ }; /** * of_find_device_by_node - Find the platform_device associated with a node * @np: Pointer to device tree node * * Takes a reference to the embedded struct device which needs to be dropped * after use. * * Return: platform_device pointer, or NULL if not found */ struct platform_device *of_find_device_by_node(struct device_node *np) { struct device *dev; dev = bus_find_device_by_of_node(&platform_bus_type, np); return dev ? to_platform_device(dev) : NULL; } EXPORT_SYMBOL(of_find_device_by_node); int of_device_add(struct platform_device *ofdev) { BUG_ON(ofdev->dev.of_node == NULL); /* name and id have to be set so that the platform bus doesn't get * confused on matching */ ofdev->name = dev_name(&ofdev->dev); ofdev->id = PLATFORM_DEVID_NONE; /* * If this device has not binding numa node in devicetree, that is * of_node_to_nid returns NUMA_NO_NODE. device_add will assume that this * device is on the same node as the parent. */ set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node)); return device_add(&ofdev->dev); } int of_device_register(struct platform_device *pdev) { device_initialize(&pdev->dev); return of_device_add(pdev); } EXPORT_SYMBOL(of_device_register); void of_device_unregister(struct platform_device *ofdev) { device_unregister(&ofdev->dev); } EXPORT_SYMBOL(of_device_unregister); #ifdef CONFIG_OF_ADDRESS static const struct of_device_id of_skipped_node_table[] = { { .compatible = "operating-points-v2", }, {} /* Empty terminated list */ }; /* * The following routines scan a subtree and registers a device for * each applicable node. * * Note: sparc doesn't use these routines because it has a different * mechanism for creating devices from device tree nodes. */ /** * of_device_alloc - Allocate and initialize an of_device * @np: device node to assign to device * @bus_id: Name to assign to the device. May be null to use default name. * @parent: Parent device. */ struct platform_device *of_device_alloc(struct device_node *np, const char *bus_id, struct device *parent) { struct platform_device *dev; int rc, i, num_reg = 0; struct resource *res; dev = platform_device_alloc("", PLATFORM_DEVID_NONE); if (!dev) return NULL; /* count the io resources */ num_reg = of_address_count(np); /* Populate the resource table */ if (num_reg) { res = kcalloc(num_reg, sizeof(*res), GFP_KERNEL); if (!res) { platform_device_put(dev); return NULL; } dev->num_resources = num_reg; dev->resource = res; for (i = 0; i < num_reg; i++, res++) { rc = of_address_to_resource(np, i, res); WARN_ON(rc); } } /* setup generic device info */ device_set_node(&dev->dev, of_fwnode_handle(of_node_get(np))); dev->dev.parent = parent ? : &platform_bus; if (bus_id) dev_set_name(&dev->dev, "%s", bus_id); else of_device_make_bus_id(&dev->dev); return dev; } EXPORT_SYMBOL(of_device_alloc); /** * of_platform_device_create_pdata - Alloc, initialize and register an of_device * @np: pointer to node to create device for * @bus_id: name to assign device * @platform_data: pointer to populate platform_data pointer with * @parent: Linux device model parent device. * * Return: Pointer to created platform device, or NULL if a device was not * registered. Unavailable devices will not get registered. */ static struct platform_device *of_platform_device_create_pdata( struct device_node *np, const char *bus_id, void *platform_data, struct device *parent) { struct platform_device *dev; pr_debug("create platform device: %pOF\n", np); if (!of_device_is_available(np) || of_node_test_and_set_flag(np, OF_POPULATED)) return NULL; dev = of_device_alloc(np, bus_id, parent); if (!dev) goto err_clear_flag; dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); if (!dev->dev.dma_mask) dev->dev.dma_mask = &dev->dev.coherent_dma_mask; dev->dev.bus = &platform_bus_type; dev->dev.platform_data = platform_data; of_msi_configure(&dev->dev, dev->dev.of_node); if (of_device_add(dev) != 0) { platform_device_put(dev); goto err_clear_flag; } return dev; err_clear_flag: of_node_clear_flag(np, OF_POPULATED); return NULL; } /** * of_platform_device_create - Alloc, initialize and register an of_device * @np: pointer to node to create device for * @bus_id: name to assign device * @parent: Linux device model parent device. * * Return: Pointer to created platform device, or NULL if a device was not * registered. Unavailable devices will not get registered. */ struct platform_device *of_platform_device_create(struct device_node *np, const char *bus_id, struct device *parent) { return of_platform_device_create_pdata(np, bus_id, NULL, parent); } EXPORT_SYMBOL(of_platform_device_create); #ifdef CONFIG_ARM_AMBA static struct amba_device *of_amba_device_create(struct device_node *node, const char *bus_id, void *platform_data, struct device *parent) { struct amba_device *dev; int ret; pr_debug("Creating amba device %pOF\n", node); if (!of_device_is_available(node) || of_node_test_and_set_flag(node, OF_POPULATED)) return NULL; dev = amba_device_alloc(NULL, 0, 0); if (!dev) goto err_clear_flag; /* AMBA devices only support a single DMA mask */ dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); dev->dev.dma_mask = &dev->dev.coherent_dma_mask; /* setup generic device info */ device_set_node(&dev->dev, of_fwnode_handle(node)); dev->dev.parent = parent ? : &platform_bus; dev->dev.platform_data = platform_data; if (bus_id) dev_set_name(&dev->dev, "%s", bus_id); else of_device_make_bus_id(&dev->dev); /* Allow the HW Peripheral ID to be overridden */ of_property_read_u32(node, "arm,primecell-periphid", &dev->periphid); ret = of_address_to_resource(node, 0, &dev->res); if (ret) { pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n", ret, node); goto err_free; } ret = amba_device_add(dev, &iomem_resource); if (ret) { pr_err("amba_device_add() failed (%d) for %pOF\n", ret, node); goto err_free; } return dev; err_free: amba_device_put(dev); err_clear_flag: of_node_clear_flag(node, OF_POPULATED); return NULL; } #else /* CONFIG_ARM_AMBA */ static struct amba_device *of_amba_device_create(struct device_node *node, const char *bus_id, void *platform_data, struct device *parent) { return NULL; } #endif /* CONFIG_ARM_AMBA */ /* * of_dev_lookup() - Given a device node, lookup the preferred Linux name */ static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, struct device_node *np) { const struct of_dev_auxdata *auxdata; struct resource res; int compatible = 0; if (!lookup) return NULL; auxdata = lookup; for (; auxdata->compatible; auxdata++) { if (!of_device_is_compatible(np, auxdata->compatible)) continue; compatible++; if (!of_address_to_resource(np, 0, &res)) if (res.start != auxdata->phys_addr) continue; pr_debug("%pOF: devname=%s\n", np, auxdata->name); return auxdata; } if (!compatible) return NULL; /* Try compatible match if no phys_addr and name are specified */ auxdata = lookup; for (; auxdata->compatible; auxdata++) { if (!of_device_is_compatible(np, auxdata->compatible)) continue; if (!auxdata->phys_addr && !auxdata->name) { pr_debug("%pOF: compatible match\n", np); return auxdata; } } return NULL; } /** * of_platform_bus_create() - Create a device for a node and its children. * @bus: device node of the bus to instantiate * @matches: match table for bus nodes * @lookup: auxdata table for matching id and platform_data with device nodes * @parent: parent for new device, or NULL for top level. * @strict: require compatible property * * Creates a platform_device for the provided device_node, and optionally * recursively create devices for all the child nodes. */ static int of_platform_bus_create(struct device_node *bus, const struct of_device_id *matches, const struct of_dev_auxdata *lookup, struct device *parent, bool strict) { const struct of_dev_auxdata *auxdata; struct platform_device *dev; const char *bus_id = NULL; void *platform_data = NULL; int rc = 0; /* Make sure it has a compatible property */ if (strict && (!of_get_property(bus, "compatible", NULL))) { pr_debug("%s() - skipping %pOF, no compatible prop\n", __func__, bus); return 0; } /* Skip nodes for which we don't want to create devices */ if (unlikely(of_match_node(of_skipped_node_table, bus))) { pr_debug("%s() - skipping %pOF node\n", __func__, bus); return 0; } if (of_node_check_flag(bus, OF_POPULATED_BUS)) { pr_debug("%s() - skipping %pOF, already populated\n", __func__, bus); return 0; } auxdata = of_dev_lookup(lookup, bus); if (auxdata) { bus_id = auxdata->name; platform_data = auxdata->platform_data; } if (of_device_is_compatible(bus, "arm,primecell")) { /* * Don't return an error here to keep compatibility with older * device tree files. */ of_amba_device_create(bus, bus_id, platform_data, parent); return 0; } dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); if (!dev || !of_match_node(matches, bus)) return 0; for_each_child_of_node_scoped(bus, child) { pr_debug(" create child: %pOF\n", child); rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); if (rc) break; } of_node_set_flag(bus, OF_POPULATED_BUS); return rc; } /** * of_platform_bus_probe() - Probe the device-tree for platform buses * @root: parent of the first level to probe or NULL for the root of the tree * @matches: match table for bus nodes * @parent: parent to hook devices from, NULL for toplevel * * Note that children of the provided root are not instantiated as devices * unless the specified root itself matches the bus list and is not NULL. */ int of_platform_bus_probe(struct device_node *root, const struct of_device_id *matches, struct device *parent) { struct device_node *child; int rc = 0; root = root ? of_node_get(root) : of_find_node_by_path("/"); if (!root) return -EINVAL; pr_debug("%s()\n", __func__); pr_debug(" starting at: %pOF\n", root); /* Do a self check of bus type, if there's a match, create children */ if (of_match_node(matches, root)) { rc = of_platform_bus_create(root, matches, NULL, parent, false); } else for_each_child_of_node(root, child) { if (!of_match_node(matches, child)) continue; rc = of_platform_bus_create(child, matches, NULL, parent, false); if (rc) { of_node_put(child); break; } } of_node_put(root); return rc; } EXPORT_SYMBOL(of_platform_bus_probe); /** * of_platform_populate() - Populate platform_devices from device tree data * @root: parent of the first level to probe or NULL for the root of the tree * @matches: match table, NULL to use the default * @lookup: auxdata table for matching id and platform_data with device nodes * @parent: parent to hook devices from, NULL for toplevel * * Similar to of_platform_bus_probe(), this function walks the device tree * and creates devices from nodes. It differs in that it follows the modern * convention of requiring all device nodes to have a 'compatible' property, * and it is suitable for creating devices which are children of the root * node (of_platform_bus_probe will only create children of the root which * are selected by the @matches argument). * * New board support should be using this function instead of * of_platform_bus_probe(). * * Return: 0 on success, < 0 on failure. */ int of_platform_populate(struct device_node *root, const struct of_device_id *matches, const struct of_dev_auxdata *lookup, struct device *parent) { int rc = 0; root = root ? of_node_get(root) : of_find_node_by_path("/"); if (!root) return -EINVAL; pr_debug("%s()\n", __func__); pr_debug(" starting at: %pOF\n", root); device_links_supplier_sync_state_pause(); for_each_child_of_node_scoped(root, child) { rc = of_platform_bus_create(child, matches, lookup, parent, true); if (rc) break; } device_links_supplier_sync_state_resume(); of_node_set_flag(root, OF_POPULATED_BUS); of_node_put(root); return rc; } EXPORT_SYMBOL_GPL(of_platform_populate); int of_platform_default_populate(struct device_node *root, const struct of_dev_auxdata *lookup, struct device *parent) { return of_platform_populate(root, of_default_bus_match_table, lookup, parent); } EXPORT_SYMBOL_GPL(of_platform_default_populate); static const struct of_device_id reserved_mem_matches[] = { { .compatible = "phram" }, { .compatible = "qcom,rmtfs-mem" }, { .compatible = "qcom,cmd-db" }, { .compatible = "qcom,smem" }, { .compatible = "ramoops" }, { .compatible = "nvmem-rmem" }, { .compatible = "google,open-dice" }, {}