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732 lines
20 KiB
732 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. |
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* <[email protected]> |
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* and Arnd Bergmann, IBM Corp. |
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* Merged from powerpc/kernel/of_platform.c and |
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* sparc{,64}/kernel/of_device.c by Stephen Rothwell |
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*/ |
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|
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#define pr_fmt(fmt) "OF: " fmt |
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|
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#include <linux/errno.h> |
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#include <linux/module.h> |
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#include <linux/amba/bus.h> |
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#include <linux/device.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/slab.h> |
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#include <linux/of_address.h> |
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#include <linux/of_device.h> |
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#include <linux/of_irq.h> |
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#include <linux/of_platform.h> |
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#include <linux/platform_device.h> |
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const struct of_device_id of_default_bus_match_table[] = { |
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{ .compatible = "simple-bus", }, |
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{ .compatible = "simple-mfd", }, |
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{ .compatible = "isa", }, |
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#ifdef CONFIG_ARM_AMBA |
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{ .compatible = "arm,amba-bus", }, |
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#endif /* CONFIG_ARM_AMBA */ |
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{} /* Empty terminated list */ |
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}; |
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static const struct of_device_id of_skipped_node_table[] = { |
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{ .compatible = "operating-points-v2", }, |
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{} /* Empty terminated list */ |
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}; |
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|
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/** |
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* of_find_device_by_node - Find the platform_device associated with a node |
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* @np: Pointer to device tree node |
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* |
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* Takes a reference to the embedded struct device which needs to be dropped |
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* after use. |
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* |
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* Return: platform_device pointer, or NULL if not found |
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*/ |
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struct platform_device *of_find_device_by_node(struct device_node *np) |
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{ |
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struct device *dev; |
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dev = bus_find_device_by_of_node(&platform_bus_type, np); |
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return dev ? to_platform_device(dev) : NULL; |
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} |
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EXPORT_SYMBOL(of_find_device_by_node); |
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|
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#ifdef CONFIG_OF_ADDRESS |
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/* |
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* The following routines scan a subtree and registers a device for |
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* each applicable node. |
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* |
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* Note: sparc doesn't use these routines because it has a different |
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* mechanism for creating devices from device tree nodes. |
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*/ |
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/** |
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* of_device_make_bus_id - Use the device node data to assign a unique name |
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* @dev: pointer to device structure that is linked to a device tree node |
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* |
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* This routine will first try using the translated bus address to |
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* derive a unique name. If it cannot, then it will prepend names from |
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* parent nodes until a unique name can be derived. |
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*/ |
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static void of_device_make_bus_id(struct device *dev) |
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{ |
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struct device_node *node = dev->of_node; |
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const __be32 *reg; |
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u64 addr; |
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|
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/* Construct the name, using parent nodes if necessary to ensure uniqueness */ |
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while (node->parent) { |
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/* |
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* If the address can be translated, then that is as much |
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* uniqueness as we need. Make it the first component and return |
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*/ |
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reg = of_get_property(node, "reg", NULL); |
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if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) { |
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dev_set_name(dev, dev_name(dev) ? "%llx.%pOFn:%s" : "%llx.%pOFn", |
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addr, node, dev_name(dev)); |
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return; |
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} |
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/* format arguments only used if dev_name() resolves to NULL */ |
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dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s", |
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kbasename(node->full_name), dev_name(dev)); |
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node = node->parent; |
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} |
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} |
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/** |
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* of_device_alloc - Allocate and initialize an of_device |
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* @np: device node to assign to device |
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* @bus_id: Name to assign to the device. May be null to use default name. |
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* @parent: Parent device. |
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*/ |
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struct platform_device *of_device_alloc(struct device_node *np, |
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const char *bus_id, |
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struct device *parent) |
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{ |
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struct platform_device *dev; |
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int rc, i, num_reg = 0, num_irq; |
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struct resource *res, temp_res; |
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dev = platform_device_alloc("", PLATFORM_DEVID_NONE); |
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if (!dev) |
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return NULL; |
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/* count the io and irq resources */ |
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while (of_address_to_resource(np, num_reg, &temp_res) == 0) |
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num_reg++; |
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num_irq = of_irq_count(np); |
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|
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/* Populate the resource table */ |
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if (num_irq || num_reg) { |
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res = kcalloc(num_irq + num_reg, sizeof(*res), GFP_KERNEL); |
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if (!res) { |
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platform_device_put(dev); |
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return NULL; |
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} |
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dev->num_resources = num_reg + num_irq; |
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dev->resource = res; |
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for (i = 0; i < num_reg; i++, res++) { |
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rc = of_address_to_resource(np, i, res); |
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WARN_ON(rc); |
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} |
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if (of_irq_to_resource_table(np, res, num_irq) != num_irq) |
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pr_debug("not all legacy IRQ resources mapped for %pOFn\n", |
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np); |
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} |
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dev->dev.of_node = of_node_get(np); |
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dev->dev.fwnode = &np->fwnode; |
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dev->dev.parent = parent ? : &platform_bus; |
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if (bus_id) |
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dev_set_name(&dev->dev, "%s", bus_id); |
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else |
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of_device_make_bus_id(&dev->dev); |
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return dev; |
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} |
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EXPORT_SYMBOL(of_device_alloc); |
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/** |
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* of_platform_device_create_pdata - Alloc, initialize and register an of_device |
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* @np: pointer to node to create device for |
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* @bus_id: name to assign device |
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* @platform_data: pointer to populate platform_data pointer with |
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* @parent: Linux device model parent device. |
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* |
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* Return: Pointer to created platform device, or NULL if a device was not |
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* registered. Unavailable devices will not get registered. |
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*/ |
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static struct platform_device *of_platform_device_create_pdata( |
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struct device_node *np, |
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const char *bus_id, |
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void *platform_data, |
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struct device *parent) |
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{ |
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struct platform_device *dev; |
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if (!of_device_is_available(np) || |
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of_node_test_and_set_flag(np, OF_POPULATED)) |
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return NULL; |
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dev = of_device_alloc(np, bus_id, parent); |
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if (!dev) |
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goto err_clear_flag; |
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dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); |
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if (!dev->dev.dma_mask) |
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dev->dev.dma_mask = &dev->dev.coherent_dma_mask; |
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dev->dev.bus = &platform_bus_type; |
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dev->dev.platform_data = platform_data; |
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of_msi_configure(&dev->dev, dev->dev.of_node); |
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if (of_device_add(dev) != 0) { |
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platform_device_put(dev); |
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goto err_clear_flag; |
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} |
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return dev; |
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err_clear_flag: |
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of_node_clear_flag(np, OF_POPULATED); |
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return NULL; |
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} |
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/** |
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* of_platform_device_create - Alloc, initialize and register an of_device |
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* @np: pointer to node to create device for |
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* @bus_id: name to assign device |
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* @parent: Linux device model parent device. |
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* |
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* Return: Pointer to created platform device, or NULL if a device was not |
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* registered. Unavailable devices will not get registered. |
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*/ |
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struct platform_device *of_platform_device_create(struct device_node *np, |
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const char *bus_id, |
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struct device *parent) |
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{ |
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return of_platform_device_create_pdata(np, bus_id, NULL, parent); |
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} |
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EXPORT_SYMBOL(of_platform_device_create); |
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#ifdef CONFIG_ARM_AMBA |
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static struct amba_device *of_amba_device_create(struct device_node *node, |
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const char *bus_id, |
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void *platform_data, |
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struct device *parent) |
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{ |
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struct amba_device *dev; |
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const void *prop; |
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int i, ret; |
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pr_debug("Creating amba device %pOF\n", node); |
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if (!of_device_is_available(node) || |
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of_node_test_and_set_flag(node, OF_POPULATED)) |
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return NULL; |
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dev = amba_device_alloc(NULL, 0, 0); |
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if (!dev) |
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goto err_clear_flag; |
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/* AMBA devices only support a single DMA mask */ |
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dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); |
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dev->dev.dma_mask = &dev->dev.coherent_dma_mask; |
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/* setup generic device info */ |
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dev->dev.of_node = of_node_get(node); |
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dev->dev.fwnode = &node->fwnode; |
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dev->dev.parent = parent ? : &platform_bus; |
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dev->dev.platform_data = platform_data; |
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if (bus_id) |
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dev_set_name(&dev->dev, "%s", bus_id); |
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else |
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of_device_make_bus_id(&dev->dev); |
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/* Allow the HW Peripheral ID to be overridden */ |
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prop = of_get_property(node, "arm,primecell-periphid", NULL); |
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if (prop) |
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dev->periphid = of_read_ulong(prop, 1); |
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/* Decode the IRQs and address ranges */ |
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for (i = 0; i < AMBA_NR_IRQS; i++) |
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dev->irq[i] = irq_of_parse_and_map(node, i); |
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ret = of_address_to_resource(node, 0, &dev->res); |
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if (ret) { |
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pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n", |
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ret, node); |
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goto err_free; |
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} |
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ret = amba_device_add(dev, &iomem_resource); |
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if (ret) { |
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pr_err("amba_device_add() failed (%d) for %pOF\n", |
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ret, node); |
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goto err_free; |
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} |
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return dev; |
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err_free: |
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amba_device_put(dev); |
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err_clear_flag: |
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of_node_clear_flag(node, OF_POPULATED); |
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return NULL; |
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} |
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#else /* CONFIG_ARM_AMBA */ |
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static struct amba_device *of_amba_device_create(struct device_node *node, |
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const char *bus_id, |
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void *platform_data, |
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struct device *parent) |
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{ |
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return NULL; |
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} |
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#endif /* CONFIG_ARM_AMBA */ |
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/* |
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* of_dev_lookup() - Given a device node, lookup the preferred Linux name |
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*/ |
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static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, |
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struct device_node *np) |
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{ |
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const struct of_dev_auxdata *auxdata; |
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struct resource res; |
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int compatible = 0; |
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if (!lookup) |
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return NULL; |
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auxdata = lookup; |
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for (; auxdata->compatible; auxdata++) { |
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if (!of_device_is_compatible(np, auxdata->compatible)) |
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continue; |
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compatible++; |
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if (!of_address_to_resource(np, 0, &res)) |
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if (res.start != auxdata->phys_addr) |
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continue; |
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pr_debug("%pOF: devname=%s\n", np, auxdata->name); |
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return auxdata; |
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} |
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if (!compatible) |
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return NULL; |
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/* Try compatible match if no phys_addr and name are specified */ |
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auxdata = lookup; |
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for (; auxdata->compatible; auxdata++) { |
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if (!of_device_is_compatible(np, auxdata->compatible)) |
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continue; |
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if (!auxdata->phys_addr && !auxdata->name) { |
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pr_debug("%pOF: compatible match\n", np); |
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return auxdata; |
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} |
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} |
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return NULL; |
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} |
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/** |
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* of_platform_bus_create() - Create a device for a node and its children. |
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* @bus: device node of the bus to instantiate |
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* @matches: match table for bus nodes |
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* @lookup: auxdata table for matching id and platform_data with device nodes |
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* @parent: parent for new device, or NULL for top level. |
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* @strict: require compatible property |
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* |
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* Creates a platform_device for the provided device_node, and optionally |
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* recursively create devices for all the child nodes. |
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*/ |
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static int of_platform_bus_create(struct device_node *bus, |
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const struct of_device_id *matches, |
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const struct of_dev_auxdata *lookup, |
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struct device *parent, bool strict) |
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{ |
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const struct of_dev_auxdata *auxdata; |
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struct device_node *child; |
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struct platform_device *dev; |
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const char *bus_id = NULL; |
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void *platform_data = NULL; |
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int rc = 0; |
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/* Make sure it has a compatible property */ |
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if (strict && (!of_get_property(bus, "compatible", NULL))) { |
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pr_debug("%s() - skipping %pOF, no compatible prop\n", |
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__func__, bus); |
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return 0; |
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} |
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/* Skip nodes for which we don't want to create devices */ |
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if (unlikely(of_match_node(of_skipped_node_table, bus))) { |
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pr_debug("%s() - skipping %pOF node\n", __func__, bus); |
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return 0; |
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} |
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if (of_node_check_flag(bus, OF_POPULATED_BUS)) { |
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pr_debug("%s() - skipping %pOF, already populated\n", |
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__func__, bus); |
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return 0; |
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} |
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auxdata = of_dev_lookup(lookup, bus); |
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if (auxdata) { |
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bus_id = auxdata->name; |
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platform_data = auxdata->platform_data; |
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} |
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if (of_device_is_compatible(bus, "arm,primecell")) { |
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/* |
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* Don't return an error here to keep compatibility with older |
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* device tree files. |
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*/ |
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of_amba_device_create(bus, bus_id, platform_data, parent); |
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return 0; |
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} |
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dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); |
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if (!dev || !of_match_node(matches, bus)) |
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return 0; |
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for_each_child_of_node(bus, child) { |
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pr_debug(" create child: %pOF\n", child); |
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rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); |
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if (rc) { |
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of_node_put(child); |
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break; |
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} |
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} |
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of_node_set_flag(bus, OF_POPULATED_BUS); |
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return rc; |
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} |
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/** |
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* of_platform_bus_probe() - Probe the device-tree for platform buses |
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* @root: parent of the first level to probe or NULL for the root of the tree |
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* @matches: match table for bus nodes |
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* @parent: parent to hook devices from, NULL for toplevel |
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* |
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* Note that children of the provided root are not instantiated as devices |
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* unless the specified root itself matches the bus list and is not NULL. |
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*/ |
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int of_platform_bus_probe(struct device_node *root, |
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const struct of_device_id *matches, |
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struct device *parent) |
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{ |
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struct device_node *child; |
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int rc = 0; |
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root = root ? of_node_get(root) : of_find_node_by_path("/"); |
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if (!root) |
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return -EINVAL; |
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pr_debug("%s()\n", __func__); |
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pr_debug(" starting at: %pOF\n", root); |
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/* Do a self check of bus type, if there's a match, create children */ |
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if (of_match_node(matches, root)) { |
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rc = of_platform_bus_create(root, matches, NULL, parent, false); |
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} else for_each_child_of_node(root, child) { |
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if (!of_match_node(matches, child)) |
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continue; |
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rc = of_platform_bus_create(child, matches, NULL, parent, false); |
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if (rc) { |
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of_node_put(child); |
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break; |
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} |
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} |
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of_node_put(root); |
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return rc; |
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} |
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EXPORT_SYMBOL(of_platform_bus_probe); |
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/** |
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* of_platform_populate() - Populate platform_devices from device tree data |
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* @root: parent of the first level to probe or NULL for the root of the tree |
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* @matches: match table, NULL to use the default |
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* @lookup: auxdata table for matching id and platform_data with device nodes |
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* @parent: parent to hook devices from, NULL for toplevel |
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* |
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* Similar to of_platform_bus_probe(), this function walks the device tree |
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* and creates devices from nodes. It differs in that it follows the modern |
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* convention of requiring all device nodes to have a 'compatible' property, |
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* and it is suitable for creating devices which are children of the root |
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* node (of_platform_bus_probe will only create children of the root which |
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* are selected by the @matches argument). |
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* |
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* New board support should be using this function instead of |
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* of_platform_bus_probe(). |
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* |
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* Return: 0 on success, < 0 on failure. |
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*/ |
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int of_platform_populate(struct device_node *root, |
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const struct of_device_id *matches, |
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const struct of_dev_auxdata *lookup, |
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struct device *parent) |
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{ |
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struct device_node *child; |
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int rc = 0; |
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root = root ? of_node_get(root) : of_find_node_by_path("/"); |
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if (!root) |
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return -EINVAL; |
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pr_debug("%s()\n", __func__); |
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pr_debug(" starting at: %pOF\n", root); |
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device_links_supplier_sync_state_pause(); |
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for_each_child_of_node(root, child) { |
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rc = of_platform_bus_create(child, matches, lookup, parent, true); |
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if (rc) { |
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of_node_put(child); |
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break; |
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} |
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} |
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device_links_supplier_sync_state_resume(); |
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of_node_set_flag(root, OF_POPULATED_BUS); |
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of_node_put(root); |
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return rc; |
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} |
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EXPORT_SYMBOL_GPL(of_platform_populate); |
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|
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int of_platform_default_populate(struct device_node *root, |
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const struct of_dev_auxdata *lookup, |
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struct device *parent) |
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{ |
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return of_platform_populate(root, of_default_bus_match_table, lookup, |
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parent); |
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} |
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EXPORT_SYMBOL_GPL(of_platform_default_populate); |
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|
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#ifndef CONFIG_PPC |
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static const struct of_device_id reserved_mem_matches[] = { |
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{ .compatible = "qcom,rmtfs-mem" }, |
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{ .compatible = "qcom,cmd-db" }, |
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{ .compatible = "ramoops" }, |
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{ .compatible = "nvmem-rmem" }, |
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{} |
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}; |
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static int __init of_platform_default_populate_init(void) |
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{ |
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struct device_node *node; |
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device_links_supplier_sync_state_pause(); |
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|
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if (!of_have_populated_dt()) |
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return -ENODEV; |
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|
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/* |
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* Handle certain compatibles explicitly, since we don't want to create |
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* platform_devices for every node in /reserved-memory with a |
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* "compatible", |
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*/ |
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for_each_matching_node(node, reserved_mem_matches) |
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of_platform_device_create(node, NULL, NULL); |
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|
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node = of_find_node_by_path("/firmware"); |
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if (node) { |
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of_platform_populate(node, NULL, NULL, NULL); |
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of_node_put(node); |
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} |
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|
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/* Populate everything else. */ |
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of_platform_default_populate(NULL, NULL, NULL); |
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|
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return 0; |
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} |
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arch_initcall_sync(of_platform_default_populate_init); |
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|
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static int __init of_platform_sync_state_init(void) |
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{ |
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device_links_supplier_sync_state_resume(); |
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return 0; |
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} |
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late_initcall_sync(of_platform_sync_state_init); |
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#endif |
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|
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int of_platform_device_destroy(struct device *dev, void *data) |
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{ |
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/* Do not touch devices not populated from the device tree */ |
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if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) |
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return 0; |
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|
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/* Recurse for any nodes that were treated as busses */ |
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if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS)) |
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device_for_each_child(dev, NULL, of_platform_device_destroy); |
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|
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of_node_clear_flag(dev->of_node, OF_POPULATED); |
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of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); |
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|
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if (dev->bus == &platform_bus_type) |
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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, recurrently, 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, recurrently, 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; |
|
|
|
switch (of_reconfig_get_state_change(action, rd)) { |
|
case OF_RECONFIG_CHANGE_ADD: |
|
/* verify that the parent is a bus */ |
|
if (!of_node_check_flag(rd->dn->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; |
|
|
|
/* pdev_parent may be NULL when no bus platform device */ |
|
pdev_parent = of_find_device_by_node(rd->dn->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 */
|
|
|