mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-17 20:46:49 +07:00
8c89ef7b6b
This addresses a v4.19-rc1 regression in the PL111 DRM driver in drivers/gpu/pl111/* The driver uses the CMA KMS helpers and will thus at some point call down to dma_alloc_attrs() to allocate a chunk of contigous DMA memory for the framebuffer. It appears that in v4.18, it was OK that this (and other DMA mastering AMBA devices) left dev->coherent_dma_mask blank (zero). In v4.19-rc1 the WARN_ON_ONCE(dev && !dev->coherent_dma_mask) in dma_alloc_attrs() in include/linux/dma-mapping.h is triggered. The allocation later fails when get_coherent_dma_mask() is called from __dma_alloc() and __dma_alloc() returns NULL: drm-clcd-pl111 dev:20: coherent DMA mask is unset drm-clcd-pl111 dev:20: [drm:drm_fb_helper_fbdev_setup] *ERROR* Failed to set fbdev configuration It turns out that in commit4d8bde883b
("OF: Don't set default coherent DMA mask") the OF core stops setting the default DMA mask on new devices, especially those lines of the patch: - if (!dev->coherent_dma_mask) - dev->coherent_dma_mask = DMA_BIT_MASK(32); Robin Murphy solved a similar problem ina5516219b1
("of/platform: Initialise default DMA masks") by simply assigning dev.coherent_dma_mask and the dev.dma_mask to point to the same when creating devices from the device tree, and introducing the same code into the code path creating AMBA/PrimeCell devices solved my problem, graphics now come up. The code simply assumes that the device can access all of the system memory by setting the coherent DMA mask to 0xffffffff when creating a device from the device tree, which is crude, but seems to be what kernel v4.18 assumed. The AMBA PrimeCells do not differ between coherent and streaming DMA so we can just assign the same to any DMA mask. Possibly drivers should augment their coherent DMA mask in accordance with "dma-ranges" from the device tree if more finegranular masking is needed. Reported-by: Russell King <linux@armlinux.org.uk> Fixes:4d8bde883b
("OF: Don't set default coherent DMA mask") Cc: Russell King <linux@armlinux.org.uk> Cc: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Christoph Hellwig <hch@lst.de>
727 lines
20 KiB
C
727 lines
20 KiB
C
// 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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* <benh@kernel.crashing.org>
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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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#define pr_fmt(fmt) "OF: " fmt
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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_iommu.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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static int of_dev_node_match(struct device *dev, void *data)
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{
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return dev->of_node == data;
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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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* Returns 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(&platform_bus_type, NULL, np, of_dev_node_match);
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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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#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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/* 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.%s:%s" : "%llx.%s",
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(unsigned long long)addr, node->name,
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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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/* 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 %s\n",
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np->name);
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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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* Returns 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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* Returns 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_devname_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).
|
|
*
|
|
* New board support should be using this function instead of
|
|
* of_platform_bus_probe().
|
|
*
|
|
* Returns 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;
|
|
|
|
pr_debug("%s()\n", __func__);
|
|
pr_debug(" starting at: %pOF\n", root);
|
|
|
|
for_each_child_of_node(root, child) {
|
|
rc = of_platform_bus_create(child, matches, lookup, parent, true);
|
|
if (rc) {
|
|
of_node_put(child);
|
|
break;
|
|
}
|
|
}
|
|
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);
|
|
|
|
#ifndef CONFIG_PPC
|
|
static const struct of_device_id reserved_mem_matches[] = {
|
|
{ .compatible = "qcom,rmtfs-mem" },
|
|
{ .compatible = "qcom,cmd-db" },
|
|
{ .compatible = "ramoops" },
|
|
{}
|
|
};
|
|
|
|
static int __init of_platform_default_populate_init(void)
|
|
{
|
|
struct device_node *node;
|
|
|
|
if (!of_have_populated_dt())
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/* Populate everything else. */
|
|
of_platform_default_populate(NULL, NULL, NULL);
|
|
|
|
return 0;
|
|
}
|
|
arch_initcall_sync(of_platform_default_populate_init);
|
|
#endif
|
|
|
|
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, 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(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.
|
|
*
|
|
* Returns 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);
|
|
of_dev_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 */
|
|
of_dev_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 */
|