From: Kevin Hilman <[email protected]>
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: Grant Likely <[email protected]>
Cc: Magnus Damm <[email protected]>
Signed-off-by: Kevin Hilman <[email protected]>
---
Apolgies for duplicate mails. I fat-fingered the LKML list addr the first try.
drivers/base/platform.c | 16 ++++++++++++++++
include/linux/platform_device.h | 3 +++
2 files changed, 19 insertions(+), 0 deletions(-)
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index c6c933f..a7d8a00 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -976,6 +976,22 @@ struct bus_type platform_bus_type = {
};
EXPORT_SYMBOL_GPL(platform_bus_type);
+const struct dev_pm_ops * __init platform_bus_get_pm_ops(void)
+{
+ struct bus_type *bus = &platform_bus_type;
+
+ return bus->pm;
+}
+
+int __init platform_bus_set_pm_ops(struct dev_pm_ops *pm)
+{
+ struct bus_type *bus = &platform_bus_type;
+
+ bus->pm = pm;
+
+ return 0;
+}
+
int __init platform_bus_init(void)
{
int error;
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index d7ecad0..4bce2c9 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -138,6 +138,9 @@ extern struct platform_device *platform_create_bundle(struct platform_driver *dr
struct resource *res, unsigned int n_res,
const void *data, size_t size);
+extern const struct dev_pm_ops * __init platform_bus_get_pm_ops(void);
+extern int __init platform_bus_set_pm_ops(struct dev_pm_ops *pm);
+
/* early platform driver interface */
struct early_platform_driver {
const char *class_str;
--
1.7.2.1