diff options
author | Kevin Hilman <khilman@ti.com> | 2010-08-25 12:50:00 -0700 |
---|---|---|
committer | Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com> | 2011-01-18 13:09:30 +0100 |
commit | 186dbad7b3048a8513286c5f91cf74af37af2a49 (patch) | |
tree | 0705e3ad3208ac7be6e16b038c674cfc68cd5c10 /drivers/base | |
parent | db14295816cc0673834c125dd89da4b30ec2c01f (diff) |
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>
ST-Ericsson Linux next: -
ST-Ericsson ID: AP317082
ST-Ericsson FOSS-OUT ID: -
Change-Id: Ieb901a4bc4b94bf8f8d5663cf674f872b1e7d82c
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/12710
Tested-by: Rabin VINCENT <rabin.vincent@stericsson.com>
Reviewed-by: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>
Diffstat (limited to 'drivers/base')
-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 4d99c8bdfed..eb1931c2bff 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -1017,6 +1017,41 @@ 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; |