}
EXPORT_SYMBOL(of_find_device_by_node);
-#if defined(CONFIG_PPC_DCR)
-#include <asm/dcr.h>
-#endif
-
#ifdef CONFIG_OF_ADDRESS
/*
* The following routines scan a subtree and registers a device for
* of_device_make_bus_id - Use the device node data to assign a unique name
* @dev: pointer to device structure that is linked to a device tree node
*
- * This routine will first try using either the dcr-reg or the reg property
- * value to derive a unique name. As a last resort it will use the node
- * name followed by a unique number.
+ * This routine will first try using the translated bus address to
+ * derive a unique name. If it cannot, then it will prepend names from
+ * parent nodes until a unique name can be derived.
*/
void of_device_make_bus_id(struct device *dev)
{
- static atomic_t bus_no_reg_magic;
struct device_node *node = dev->of_node;
const __be32 *reg;
u64 addr;
- const __be32 *addrp;
- int magic;
-#ifdef CONFIG_PPC_DCR
- /*
- * If it's a DCR based device, use 'd' for native DCRs
- * and 'D' for MMIO DCRs.
- */
- reg = of_get_property(node, "dcr-reg", NULL);
- if (reg) {
-#ifdef CONFIG_PPC_DCR_NATIVE
- dev_set_name(dev, "d%x.%s", *reg, node->name);
-#else /* CONFIG_PPC_DCR_NATIVE */
- u64 addr = of_translate_dcr_address(node, *reg, NULL);
- if (addr != OF_BAD_ADDR) {
- dev_set_name(dev, "D%llx.%s",
- (unsigned long long)addr, node->name);
+ /* Construct the name, using parent nodes if necessary to ensure uniqueness */
+ while (node->parent) {
+ /*
+ * If the address can be translated, then that is as much
+ * uniqueness as we need. Make it the first component and return
+ */
+ reg = of_get_property(node, "reg", NULL);
+ if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {
+ dev_set_name(dev, dev_name(dev) ? "%llx.%s:%s" : "%llx.%s",
+ (unsigned long long)addr, node->name,
+ dev_name(dev));
return;
}
-#endif /* !CONFIG_PPC_DCR_NATIVE */
- }
-#endif /* CONFIG_PPC_DCR */
- /*
- * For MMIO, get the physical address
- */
- reg = of_get_property(node, "reg", NULL);
- if (reg) {
- if (of_can_translate_address(node)) {
- addr = of_translate_address(node, reg);
- } else {
- addrp = of_get_address(node, 0, NULL, NULL);
- if (addrp)
- addr = of_read_number(addrp, 1);
- else
- addr = OF_BAD_ADDR;
- }
- if (addr != OF_BAD_ADDR) {
- dev_set_name(dev, "%llx.%s",
- (unsigned long long)addr, node->name);
- return;
- }
+ /* format arguments only used if dev_name() resolves to NULL */
+ dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s",
+ strrchr(node->full_name, '/') + 1, dev_name(dev));
+ node = node->parent;
}
-
- /*
- * No BusID, use the node name and add a globally incremented
- * counter (and pray...)
- */
- magic = atomic_add_return(1, &bus_no_reg_magic);
- dev_set_name(dev, "%s.%d", node->name, magic - 1);
}
/**
return NULL;
/* count the io and irq resources */
- if (of_can_translate_address(np))
- while (of_address_to_resource(np, num_reg, &temp_res) == 0)
- num_reg++;
+ while (of_address_to_resource(np, num_reg, &temp_res) == 0)
+ num_reg++;
num_irq = of_irq_count(np);
/* Populate the resource table */
{
struct platform_device *dev;
- if (!of_device_is_available(np))
+ if (!of_device_is_available(np) ||
+ of_node_test_and_set_flag(np, OF_POPULATED))
return NULL;
dev = of_device_alloc(np, bus_id, parent);
if (!dev)
- return NULL;
+ goto err_clear_flag;
of_dma_configure(dev);
dev->dev.bus = &platform_bus_type;
if (of_device_add(dev) != 0) {
platform_device_put(dev);
- return NULL;
+ goto err_clear_flag;
}
return dev;
+
+err_clear_flag:
+ of_node_clear_flag(np, OF_POPULATED);
+ return NULL;
}
/**
pr_debug("Creating amba device %s\n", node->full_name);
- if (!of_device_is_available(node))
+ if (!of_device_is_available(node) ||
+ of_node_test_and_set_flag(node, OF_POPULATED))
return NULL;
dev = amba_device_alloc(NULL, 0, 0);
if (!dev) {
pr_err("%s(): amba_device_alloc() failed for %s\n",
__func__, node->full_name);
- return NULL;
+ goto err_clear_flag;
}
/* setup generic device info */
err_free:
amba_device_put(dev);
+err_clear_flag:
+ of_node_clear_flag(node, OF_POPULATED);
return NULL;
}
#else /* CONFIG_ARM_AMBA */
return rc;
}
EXPORT_SYMBOL_GPL(of_platform_populate);
+
+static int of_platform_device_destroy(struct device *dev, void *data)
+{
+ bool *children_left = data;
+
+ /* Do not touch devices not populated from the device tree */
+ if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) {
+ *children_left = true;
+ return 0;
+ }
+
+ /* Recurse, but don't touch this device if it has any children left */
+ if (of_platform_depopulate(dev) != 0) {
+ *children_left = true;
+ return 0;
+ }
+
+ 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
+ else {
+ *children_left = true;
+ return 0;
+ }
+
+ of_node_clear_flag(dev->of_node, OF_POPULATED);
+
+ return 0;
+}
+
+/**
+ * of_platform_depopulate() - Remove devices populated from device tree
+ * @parent: device which childred 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).
+ *
+ * Returns 0 when all children devices have been removed or
+ * -EBUSY when some children remained.
+ */
+int of_platform_depopulate(struct device *parent)
+{
+ bool children_left = false;
+
+ device_for_each_child(parent, &children_left,
+ of_platform_device_destroy);
+
+ return children_left ? -EBUSY : 0;
+}
+EXPORT_SYMBOL_GPL(of_platform_depopulate);
+
#endif /* CONFIG_OF_ADDRESS */
projects / karo-tx-linux.git / blobdiff