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author | Pawel Moll <pawel.moll@arm.com> | 2014-05-15 16:55:24 +0100 |
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committer | Pawel Moll <pawel.moll@arm.com> | 2014-05-15 17:02:14 +0100 |
commit | c6e126de43e7d4abfd6cf796b40589db3a046167 (patch) | |
tree | 78db63df172516da22235bed2c30544a69fc20bd /include/linux/of_platform.h | |
parent | d6d211db37e75de2ddc3a4f979038c40df7cc79c (diff) | |
download | linux-stable-c6e126de43e7d4abfd6cf796b40589db3a046167.tar.gz linux-stable-c6e126de43e7d4abfd6cf796b40589db3a046167.tar.bz2 linux-stable-c6e126de43e7d4abfd6cf796b40589db3a046167.zip |
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 <pawel.moll@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Grant Likely <grant.likely@linaro.org>
Diffstat (limited to 'include/linux/of_platform.h')
-rw-r--r-- | include/linux/of_platform.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/of_platform.h b/include/linux/of_platform.h index 05cb4a928252..b1010eeaac0d 100644 --- a/include/linux/of_platform.h +++ b/include/linux/of_platform.h @@ -72,6 +72,7 @@ extern int of_platform_populate(struct device_node *root, const struct of_device_id *matches, const struct of_dev_auxdata *lookup, struct device *parent); +extern int of_platform_depopulate(struct device *parent); #else static inline int of_platform_populate(struct device_node *root, const struct of_device_id *matches, @@ -80,6 +81,10 @@ static inline int of_platform_populate(struct device_node *root, { return -ENODEV; } +static inline int of_platform_depopulate(struct device *parent) +{ + return -ENODEV; +} #endif #endif /* _LINUX_OF_PLATFORM_H */ |