path: root/include/linux/of.h
diff options
authorPawel Moll <>2014-05-15 16:55:24 +0100
committerPawel Moll <>2014-05-15 17:02:14 +0100
commitc6e126de43e7d4abfd6cf796b40589db3a046167 (patch)
tree78db63df172516da22235bed2c30544a69fc20bd /include/linux/of.h
parentd6d211db37e75de2ddc3a4f979038c40df7cc79c (diff)
of: Keep track of populated platform devices
In "Device Tree powered" systems, platform devices are usually massively populated with of_platform_populate() call, executed at some level of initcalls, either by generic architecture or by platform-specific code. There are situations though where certain devices must be created (and bound with drivers) before all the others. This presents a challenge, as devices created explicitly would be created again by of_platform_populate(). This patch tries to solve that issue in a generic way, adding a "populated" flag for a DT node description. Subsequent of_platform_populate() will skip such nodes (and its children) in a similar way to the non-available ones. This patch also adds of_platform_depopulate() as an operation complementary to the _populate() one. It removes a platform or an amba device populated from the Device Tree, together with its all children (leaving, however, devices without associated of_node untouched) clearing the "populated" flag on the way. Signed-off-by: Pawel Moll <> Reviewed-by: Rob Herring <> Acked-by: Grant Likely <>
Diffstat (limited to 'include/linux/of.h')
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/of.h b/include/linux/of.h
index 3bad8d106e0e..4c50d0b78b89 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -130,6 +130,12 @@ static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
return test_bit(flag, &n->_flags);
+static inline int of_node_test_and_set_flag(struct device_node *n,
+ unsigned long flag)
+ return test_and_set_bit(flag, &n->_flags);
static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
set_bit(flag, &n->_flags);
@@ -197,6 +203,7 @@ static inline unsigned long of_read_ulong(const __be32 *cell, int size)
/* flag descriptions */
#define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
#define OF_DETACHED 2 /* node has been detached from the device tree */
+#define OF_POPULATED 3 /* device already created for the node */
#define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
#define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)