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author | Grant Likely <grant.likely@secretlab.ca> | 2011-06-21 10:59:34 -0600 |
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committer | Grant Likely <grant.likely@secretlab.ca> | 2011-06-21 11:02:29 -0600 |
commit | 29d4f8a4974aacf46b028fa92f9dd3ffdba3e614 (patch) | |
tree | 35641937ac753b8b5d0255ef9ef312024e09a785 | |
parent | cbb49c2665eebfd1fa2e491403684d0542662137 (diff) | |
download | op-kernel-dev-29d4f8a4974aacf46b028fa92f9dd3ffdba3e614.zip op-kernel-dev-29d4f8a4974aacf46b028fa92f9dd3ffdba3e614.tar.gz |
dt: add of_platform_populate() for creating device from the device tree
of_platform_populate() is similar to of_platform_bus_probe() except
that it strictly enforces that all device nodes must have a compatible
property, and it can be used to register devices (not buses) which are
children of the root node.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
-rw-r--r-- | drivers/of/platform.c | 54 | ||||
-rw-r--r-- | include/linux/of_platform.h | 3 |
2 files changed, 53 insertions, 4 deletions
diff --git a/drivers/of/platform.c b/drivers/of/platform.c index bb483ef..1f4a5d3 100644 --- a/drivers/of/platform.c +++ b/drivers/of/platform.c @@ -229,19 +229,26 @@ EXPORT_SYMBOL(of_platform_device_create); */ static int of_platform_bus_create(struct device_node *bus, const struct of_device_id *matches, - struct device *parent) + struct device *parent, bool strict) { struct device_node *child; struct platform_device *dev; int rc = 0; + /* Make sure it has a compatible property */ + if (strict && (!of_get_property(bus, "compatible", NULL))) { + pr_debug("%s() - skipping %s, no compatible prop\n", + __func__, bus->full_name); + return 0; + } + dev = of_platform_device_create(bus, NULL, parent); if (!dev || !of_match_node(matches, bus)) return 0; for_each_child_of_node(bus, child) { pr_debug(" create child: %s\n", child->full_name); - rc = of_platform_bus_create(child, matches, &dev->dev); + rc = of_platform_bus_create(child, matches, &dev->dev, strict); if (rc) { of_node_put(child); break; @@ -275,11 +282,11 @@ int of_platform_bus_probe(struct device_node *root, /* Do a self check of bus type, if there's a match, create children */ if (of_match_node(matches, root)) { - rc = of_platform_bus_create(root, matches, parent); + rc = of_platform_bus_create(root, matches, parent, false); } else for_each_child_of_node(root, child) { if (!of_match_node(matches, child)) continue; - rc = of_platform_bus_create(child, matches, parent); + rc = of_platform_bus_create(child, matches, parent, false); if (rc) break; } @@ -288,4 +295,43 @@ int of_platform_bus_probe(struct device_node *root, return rc; } EXPORT_SYMBOL(of_platform_bus_probe); + +/** + * of_platform_populate() - Populate platform_devices from device tree data + * @root: parent of the first level to probe or NULL for the root of the tree + * @matches: match table, NULL to use the default + * @parent: parent to hook devices from, NULL for toplevel + * + * Similar to of_platform_bus_probe(), this function walks the device tree + * and creates devices from nodes. It differs in that it follows the modern + * convention of requiring all device nodes to have a 'compatible' property, + * and it is suitable for creating devices which are children of the root + * node (of_platform_bus_probe will only create children of the root which + * are selected by the @matches argument). + * + * New board support should be using this function instead of + * of_platform_bus_probe(). + * + * Returns 0 on success, < 0 on failure. + */ +int of_platform_populate(struct device_node *root, + const struct of_device_id *matches, + struct device *parent) +{ + struct device_node *child; + int rc = 0; + + root = root ? of_node_get(root) : of_find_node_by_path("/"); + if (!root) + return -EINVAL; + + for_each_child_of_node(root, child) { + rc = of_platform_bus_create(child, matches, parent, true); + if (rc) + break; + } + + of_node_put(root); + return rc; +} #endif /* !CONFIG_SPARC */ diff --git a/include/linux/of_platform.h b/include/linux/of_platform.h index 8f023f8..8390233 100644 --- a/include/linux/of_platform.h +++ b/include/linux/of_platform.h @@ -57,6 +57,9 @@ extern struct platform_device *of_platform_device_create(struct device_node *np, extern int of_platform_bus_probe(struct device_node *root, const struct of_device_id *matches, struct device *parent); +extern int of_platform_populate(struct device_node *root, + const struct of_device_id *matches, + struct device *parent); #endif /* !CONFIG_SPARC */ #endif /* CONFIG_OF_DEVICE */ |