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author | Kevin Hilman <khilman@ti.com> | 2010-08-25 19:50:00 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 17:16:42 (GMT) |
commit | c64a0926710153b9d44c979d2942f4a8648fd74e (patch) | |
tree | 331fe35475ec201c69c2292773a229659e07eb8b /drivers/base/platform.c | |
parent | 1037246cacd45d951227c8798f181b3ba5c8bcbe (diff) | |
download | linux-c64a0926710153b9d44c979d2942f4a8648fd74e.tar.xz |
driver core: platform_bus: allow runtime override of dev_pm_ops
Currently, the platform_bus allows customization of several of the
busses dev_pm_ops methods by using weak symbols so that platform code
can override them. The weak-symbol approach is not scalable when
wanting to support multiple platforms in a single kernel binary.
Instead, provide __init methods for platform code to customize the
dev_pm_ops methods at runtime.
NOTE: after these dynamic methods are merged, the weak symbols should
be removed from drivers/base/platform.c. AFAIK, this will only
affect SH and sh-mobile which should be converted to use this
runtime approach instead of the weak symbols. After SH &
sh-mobile are converted, the weak symobols could be removed.
Tested on OMAP3.
Cc: Magnus Damm <magnus.damm@gmail.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base/platform.c')
-rw-r--r-- | drivers/base/platform.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c index 579906f..a01abf9 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -976,6 +976,41 @@ struct bus_type platform_bus_type = { }; EXPORT_SYMBOL_GPL(platform_bus_type); +/** + * platform_bus_get_pm_ops() - return pointer to busses dev_pm_ops + * + * This function can be used by platform code to get the current + * set of dev_pm_ops functions used by the platform_bus_type. + */ +const struct dev_pm_ops * __init platform_bus_get_pm_ops(void) +{ + return platform_bus_type.pm; +} + +/** + * platform_bus_set_pm_ops() - update dev_pm_ops for the platform_bus_type + * + * @pm: pointer to new dev_pm_ops struct to be used for platform_bus_type + * + * Platform code can override the dev_pm_ops methods of + * platform_bus_type by using this function. It is expected that + * platform code will first do a platform_bus_get_pm_ops(), then + * kmemdup it, then customize selected methods and pass a pointer to + * the new struct dev_pm_ops to this function. + * + * Since platform-specific code is customizing methods for *all* + * devices (not just platform-specific devices) it is expected that + * any custom overrides of these functions will keep existing behavior + * and simply extend it. For example, any customization of the + * runtime PM methods should continue to call the pm_generic_* + * functions as the default ones do in addition to the + * platform-specific behavior. + */ +void __init platform_bus_set_pm_ops(const struct dev_pm_ops *pm) +{ + platform_bus_type.pm = pm; +} + int __init platform_bus_init(void) { int error; |