diff options
Diffstat (limited to 'drivers/of/platform.c')
| -rw-r--r-- | drivers/of/platform.c | 641 |
1 files changed, 479 insertions, 162 deletions
diff --git a/drivers/of/platform.c b/drivers/of/platform.c index e0a6514ab46c..f77cb19973a5 100644 --- a/drivers/of/platform.c +++ b/drivers/of/platform.c @@ -1,16 +1,14 @@ +// 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 - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * */ + +#define pr_fmt(fmt) "OF: " fmt + #include <linux/errno.h> #include <linux/module.h> #include <linux/amba/bus.h> @@ -22,40 +20,66 @@ #include <linux/of_irq.h> #include <linux/of_platform.h> #include <linux/platform_device.h> +#include <linux/sysfb.h> -const struct of_device_id of_default_bus_match_table[] = { - { .compatible = "simple-bus", }, -#ifdef CONFIG_ARM_AMBA - { .compatible = "arm,amba-bus", }, -#endif /* CONFIG_ARM_AMBA */ - {} /* Empty terminated list */ -}; - -static int of_dev_node_match(struct device *dev, void *data) -{ - return dev->of_node == data; -} +#include "of_private.h" /** * of_find_device_by_node - Find the platform_device associated with a node * @np: Pointer to device tree node * - * Returns platform_device pointer, or NULL if not found + * 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(&platform_bus_type, NULL, np, of_dev_node_match); + 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); -#if defined(CONFIG_PPC_DCR) -#include <asm/dcr.h> -#endif +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. @@ -65,72 +89,6 @@ EXPORT_SYMBOL(of_find_device_by_node); */ /** - * of_device_make_bus_id - Use the device node data to assign a unique name - * @dev: pointer to device structure that is linked to a device tree node - * - * This routine will first try using either the dcr-reg or the reg property - * value to derive a unique name. As a last resort it will use the node - * name followed by a unique number. - */ -void of_device_make_bus_id(struct device *dev) -{ - static atomic_t bus_no_reg_magic; - struct device_node *node = dev->of_node; - const __be32 *reg; - u64 addr; - const __be32 *addrp; - int magic; - -#ifdef CONFIG_PPC_DCR - /* - * If it's a DCR based device, use 'd' for native DCRs - * and 'D' for MMIO DCRs. - */ - reg = of_get_property(node, "dcr-reg", NULL); - if (reg) { -#ifdef CONFIG_PPC_DCR_NATIVE - dev_set_name(dev, "d%x.%s", *reg, node->name); -#else /* CONFIG_PPC_DCR_NATIVE */ - u64 addr = of_translate_dcr_address(node, *reg, NULL); - if (addr != OF_BAD_ADDR) { - dev_set_name(dev, "D%llx.%s", - (unsigned long long)addr, node->name); - return; - } -#endif /* !CONFIG_PPC_DCR_NATIVE */ - } -#endif /* CONFIG_PPC_DCR */ - - /* - * For MMIO, get the physical address - */ - reg = of_get_property(node, "reg", NULL); - if (reg) { - if (of_can_translate_address(node)) { - addr = of_translate_address(node, reg); - } else { - addrp = of_get_address(node, 0, NULL, NULL); - if (addrp) - addr = of_read_number(addrp, 1); - else - addr = OF_BAD_ADDR; - } - if (addr != OF_BAD_ADDR) { - dev_set_name(dev, "%llx.%s", - (unsigned long long)addr, node->name); - return; - } - } - - /* - * No BusID, use the node name and add a globally incremented - * counter (and pray...) - */ - magic = atomic_add_return(1, &bus_no_reg_magic); - dev_set_name(dev, "%s.%d", node->name, magic - 1); -} - -/** * 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. @@ -141,41 +99,35 @@ struct platform_device *of_device_alloc(struct device_node *np, struct device *parent) { struct platform_device *dev; - int rc, i, num_reg = 0, num_irq; - struct resource *res, temp_res; + int rc, i, num_reg = 0; + struct resource *res; - dev = platform_device_alloc("", -1); + dev = platform_device_alloc("", PLATFORM_DEVID_NONE); if (!dev) return NULL; - /* count the io and irq resources */ - if (of_can_translate_address(np)) - while (of_address_to_resource(np, num_reg, &temp_res) == 0) - num_reg++; - num_irq = of_irq_count(np); + /* count the io resources */ + num_reg = of_address_count(np); /* Populate the resource table */ - if (num_irq || num_reg) { - res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL); + if (num_reg) { + res = kcalloc(num_reg, sizeof(*res), GFP_KERNEL); if (!res) { platform_device_put(dev); return NULL; } - dev->num_resources = num_reg + num_irq; + 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); } - WARN_ON(of_irq_to_resource_table(np, res, num_irq) != num_irq); } - dev->dev.of_node = of_node_get(np); -#if defined(CONFIG_MICROBLAZE) - dev->dev.dma_mask = &dev->archdata.dma_mask; -#endif - dev->dev.parent = parent; + /* 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); @@ -193,10 +145,10 @@ EXPORT_SYMBOL(of_device_alloc); * @platform_data: pointer to populate platform_data pointer with * @parent: Linux device model parent device. * - * Returns pointer to created platform device, or NULL if a device was not + * 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_pdata( +static struct platform_device *of_platform_device_create_pdata( struct device_node *np, const char *bus_id, void *platform_data, @@ -204,31 +156,33 @@ struct platform_device *of_platform_device_create_pdata( { struct platform_device *dev; - if (!of_device_is_available(np)) + 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) - return NULL; + goto err_clear_flag; -#if defined(CONFIG_MICROBLAZE) - dev->archdata.dma_mask = 0xffffffffUL; -#endif 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; - - /* We do not fill the DMA ops for platform devices by default. - * This is currently the responsibility of the platform code - * to do such, possibly using a device notifier - */ + of_msi_configure(&dev->dev, dev->dev.of_node); if (of_device_add(dev) != 0) { platform_device_put(dev); - return NULL; + goto err_clear_flag; } return dev; + +err_clear_flag: + of_node_clear_flag(np, OF_POPULATED); + return NULL; } /** @@ -237,7 +191,7 @@ struct platform_device *of_platform_device_create_pdata( * @bus_id: name to assign device * @parent: Linux device model parent device. * - * Returns pointer to created platform device, or NULL if a device was not + * 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, @@ -255,52 +209,54 @@ static struct amba_device *of_amba_device_create(struct device_node *node, struct device *parent) { struct amba_device *dev; - const void *prop; - int i, ret; + int ret; - pr_debug("Creating amba device %s\n", node->full_name); + pr_debug("Creating amba device %pOF\n", node); - if (!of_device_is_available(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) - return NULL; + 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 */ - dev->dev.coherent_dma_mask = ~0; - dev->dev.of_node = of_node_get(node); - dev->dev.parent = parent; + 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); - /* setup amba-specific device info */ - dev->dma_mask = ~0; - /* Allow the HW Peripheral ID to be overridden */ - prop = of_get_property(node, "arm,primecell-periphid", NULL); - if (prop) - dev->periphid = of_read_ulong(prop, 1); - - /* Decode the IRQs and address ranges */ - for (i = 0; i < AMBA_NR_IRQS; i++) - dev->irq[i] = irq_of_parse_and_map(node, i); + of_property_read_u32(node, "arm,primecell-periphid", &dev->periphid); ret = of_address_to_resource(node, 0, &dev->res); - if (ret) + 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) + 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 */ @@ -313,25 +269,43 @@ static struct amba_device *of_amba_device_create(struct device_node *node, } #endif /* CONFIG_ARM_AMBA */ -/** - * of_devname_lookup() - Given a device node, lookup the preferred Linux name +/* + * 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; - for(; lookup->compatible != NULL; lookup++) { - if (!of_device_is_compatible(np, lookup->compatible)) + 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 != lookup->phys_addr) + if (res.start != auxdata->phys_addr) continue; - pr_debug("%s: devname=%s\n", np->full_name, lookup->name); - return lookup; + 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; @@ -354,16 +328,27 @@ static int of_platform_bus_create(struct device_node *bus, struct device *parent, bool strict) { const struct of_dev_auxdata *auxdata; - struct device_node *child; 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 %s, no compatible prop\n", - __func__, bus->full_name); + if (strict && (!of_property_present(bus, "compatible"))) { + 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; } @@ -374,6 +359,10 @@ static int of_platform_bus_create(struct device_node *bus, } 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; } @@ -382,14 +371,13 @@ static int of_platform_bus_create(struct device_node *bus, if (!dev || !of_match_node(matches, bus)) return 0; - for_each_child_of_node(bus, child) { - pr_debug(" create child: %s\n", child->full_name); + 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) { - of_node_put(child); + if (rc) break; - } } + of_node_set_flag(bus, OF_POPULATED_BUS); return rc; } @@ -413,8 +401,8 @@ int of_platform_bus_probe(struct device_node *root, if (!root) return -EINVAL; - pr_debug("of_platform_bus_probe()\n"); - pr_debug(" starting at: %s\n", root->full_name); + 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)) { @@ -423,8 +411,10 @@ int of_platform_bus_probe(struct device_node *root, if (!of_match_node(matches, child)) continue; rc = of_platform_bus_create(child, matches, NULL, parent, false); - if (rc) + if (rc) { + of_node_put(child); break; + } } of_node_put(root); @@ -449,28 +439,355 @@ EXPORT_SYMBOL(of_platform_bus_probe); * New board support should be using this function instead of * of_platform_bus_probe(). * - * Returns 0 on success, < 0 on failure. + * 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) { - struct device_node *child; int rc = 0; root = root ? of_node_get(root) : of_find_node_by_path("/"); if (!root) return -EINVAL; - for_each_child_of_node(root, child) { + 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) +{ + static const struct of_device_id 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 */ + }; + + return of_platform_populate(root, 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" }, + {} +}; + +static int __init of_platform_default_populate_init(void) +{ + struct device_node *node; + + device_links_supplier_sync_state_pause(); + + if (IS_ENABLED(CONFIG_PPC)) { + struct device_node *boot_display = NULL; + struct platform_device *dev; + int display_number = 0; + int ret; + + /* Check if we have a MacOS display without a node spec */ + if (of_property_present(of_chosen, "linux,bootx-noscreen")) { + /* + * The old code tried to work out which node was the MacOS + * display based on the address. I'm dropping that since the + * lack of a node spec only happens with old BootX versions + * (users can update) and with this code, they'll still get + * a display (just not the palette hacks). + */ + dev = platform_device_alloc("bootx-noscreen", 0); + if (WARN_ON(!dev)) + return -ENOMEM; + ret = platform_device_add(dev); + if (WARN_ON(ret)) { + platform_device_put(dev); + return ret; + } + } + + /* + * For OF framebuffers, first create the device for the boot display, + * then for the other framebuffers. Only fail for the boot display; + * ignore errors for the rest. + */ + for_each_node_by_type(node, "display") { + if (!of_property_read_bool(node, "linux,opened") || + !of_property_read_bool(node, "linux,boot-display")) + continue; + dev = of_platform_device_create(node, "of-display", NULL); + of_node_put(node); + if (WARN_ON(!dev)) + return -ENOMEM; + boot_display = node; + display_number++; + break; + } + for_each_node_by_type(node, "display") { + char buf[14]; + const char *of_display_format = "of-display.%d"; + + if (!of_property_read_bool(node, "linux,opened") || node == boot_display) + continue; + ret = snprintf(buf, sizeof(buf), of_display_format, display_number++); + if (ret < sizeof(buf)) + of_platform_device_create(node, buf, NULL); + } + + } else { + /* + * Handle certain compatibles explicitly, since we don't want to create + * platform_devices for every node in /reserved-memory with a + * "compatible", + */ + for_each_matching_node(node, reserved_mem_matches) + of_platform_device_create(node, NULL, NULL); + + node = of_find_node_by_path("/firmware"); + if (node) { + of_platform_populate(node, NULL, NULL, NULL); + of_node_put(node); + } + + node = of_get_compatible_child(of_chosen, "simple-framebuffer"); + if (node) { + /* + * Since a "simple-framebuffer" device is already added + * here, disable the Generic System Framebuffers (sysfb) + * to prevent it from registering another device for the + * system framebuffer later (e.g: using the screen_info + * data that may had been filled as well). + * + * This can happen for example on DT systems that do EFI + * booting and may provide a GOP handle to the EFI stub. + */ + sysfb_disable(NULL); + of_platform_device_create(node, NULL, NULL); + of_node_put(node); + } + + /* Populate everything else. */ + of_platform_default_populate(NULL, NULL, NULL); + } + + return 0; +} +arch_initcall_sync(of_platform_default_populate_init); + +static int __init of_platform_sync_state_init(void) +{ + device_links_supplier_sync_state_resume(); + return 0; +} +late_initcall_sync(of_platform_sync_state_init); + +int of_platform_device_destroy(struct device *dev, void *data) +{ + /* Do not touch devices not populated from the device tree */ + if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) + return 0; + + /* Recurse for any nodes that were treated as busses */ + if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS)) + device_for_each_child(dev, NULL, of_platform_device_destroy); + + of_node_clear_flag(dev->of_node, OF_POPULATED); + of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); + + if (dev->bus == &platform_bus_type) + platform_device_unregister(to_platform_device(dev)); +#ifdef CONFIG_ARM_AMBA + else if (dev->bus == &amba_bustype) + amba_device_unregister(to_amba_device(dev)); +#endif + + return 0; +} +EXPORT_SYMBOL_GPL(of_platform_device_destroy); + +/** + * of_platform_depopulate() - Remove devices populated from device tree + * @parent: device which children will be removed + * + * Complementary to of_platform_populate(), this function removes children + * of the given device (and, recursively, their children) that have been + * created from their respective device tree nodes (and only those, + * leaving others - eg. manually created - unharmed). + */ +void of_platform_depopulate(struct device *parent) +{ + if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) { + device_for_each_child_reverse(parent, NULL, of_platform_device_destroy); + of_node_clear_flag(parent->of_node, OF_POPULATED_BUS); + } +} +EXPORT_SYMBOL_GPL(of_platform_depopulate); + +static void devm_of_platform_populate_release(struct device *dev, void *res) +{ + of_platform_depopulate(*(struct device **)res); +} + +/** + * devm_of_platform_populate() - Populate platform_devices from device tree data + * @dev: device that requested to populate from device tree data + * + * Similar to of_platform_populate(), but will automatically call + * of_platform_depopulate() when the device is unbound from the bus. + * + * Return: 0 on success, < 0 on failure. + */ +int devm_of_platform_populate(struct device *dev) +{ + struct device **ptr; + int ret; + + if (!dev) + return -EINVAL; + + ptr = devres_alloc(devm_of_platform_populate_release, + sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return -ENOMEM; + + ret = of_platform_populate(dev->of_node, NULL, NULL, dev); + if (ret) { + devres_free(ptr); + } else { + *ptr = dev; + devres_add(dev, ptr); + } + + return ret; +} +EXPORT_SYMBOL_GPL(devm_of_platform_populate); + +static int devm_of_platform_match(struct device *dev, void *res, void *data) +{ + struct device **ptr = res; + + if (!ptr) { + WARN_ON(!ptr); + return 0; + } + + return *ptr == data; +} + +/** + * devm_of_platform_depopulate() - Remove devices populated from device tree + * @dev: device that requested to depopulate from device tree data + * + * Complementary to devm_of_platform_populate(), this function removes children + * of the given device (and, recursively, their children) that have been + * created from their respective device tree nodes (and only those, + * leaving others - eg. manually created - unharmed). + */ +void devm_of_platform_depopulate(struct device *dev) +{ + int ret; + + ret = devres_release(dev, devm_of_platform_populate_release, + devm_of_platform_match, dev); + + WARN_ON(ret); +} +EXPORT_SYMBOL_GPL(devm_of_platform_depopulate); + +#ifdef CONFIG_OF_DYNAMIC +static int of_platform_notify(struct notifier_block *nb, + unsigned long action, void *arg) +{ + struct of_reconfig_data *rd = arg; + struct platform_device *pdev_parent, *pdev; + bool children_left; + struct device_node *parent; + + switch (of_reconfig_get_state_change(action, rd)) { + case OF_RECONFIG_CHANGE_ADD: + parent = rd->dn->parent; + /* verify that the parent is a bus (or the root node) */ + if (!of_node_is_root(parent) && + !of_node_check_flag(parent, OF_POPULATED_BUS)) + return NOTIFY_OK; /* not for us */ + + /* already populated? (driver using of_populate manually) */ + if (of_node_check_flag(rd->dn, OF_POPULATED)) + return NOTIFY_OK; + + /* + * Clear the flag before adding the device so that fw_devlink + * doesn't skip adding consumers to this device. + */ + rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE; + /* pdev_parent may be NULL when no bus platform device */ + pdev_parent = of_find_device_by_node(parent); + pdev = of_platform_device_create(rd->dn, NULL, + pdev_parent ? &pdev_parent->dev : NULL); + platform_device_put(pdev_parent); + + if (pdev == NULL) { + pr_err("%s: failed to create for '%pOF'\n", + __func__, rd->dn); + /* of_platform_device_create tosses the error code */ + return notifier_from_errno(-EINVAL); + } + break; + + case OF_RECONFIG_CHANGE_REMOVE: + + /* already depopulated? */ + if (!of_node_check_flag(rd->dn, OF_POPULATED)) + return NOTIFY_OK; + + /* find our device by node */ + pdev = of_find_device_by_node(rd->dn); + if (pdev == NULL) + return NOTIFY_OK; /* no? not meant for us */ + + /* unregister takes one ref away */ + of_platform_device_destroy(&pdev->dev, &children_left); + + /* and put the reference of the find */ + platform_device_put(pdev); + break; + } + + return NOTIFY_OK; +} + +static struct notifier_block platform_of_notifier = { + .notifier_call = of_platform_notify, +}; + +void of_platform_register_reconfig_notifier(void) +{ + WARN_ON(of_reconfig_notifier_register(&platform_of_notifier)); +} +#endif /* CONFIG_OF_DYNAMIC */ + #endif /* CONFIG_OF_ADDRESS */ |