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authorRafael J. Wysocki <rjw@sisk.pl>2011-02-16 21:53:17 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2011-03-15 00:43:16 +0100
commit7538e3db6e015e890825fbd9f8659952896ddd5b (patch)
tree01a6d8c97599474d9c5fc1ed0eb6f0addaec5652 /include
parent6831c6edc7b272a08dd2a6c71bb183a48fe98ae6 (diff)
PM: Add support for device power domains
The platform bus type is often used to handle Systems-on-a-Chip (SoC) where all devices are represented by objects of type struct platform_device. In those cases the same "platform" device driver may be used with multiple different system configurations, but the actions needed to put the devices it handles into a low-power state and back into the full-power state may depend on the design of the given SoC. The driver, however, cannot possibly include all the information necessary for the power management of its device on all the systems it is used with. Moreover, the device hierarchy in its current form also is not suitable for representing this kind of information. The patch below attempts to address this problem by introducing objects of type struct dev_power_domain that can be used for representing power domains within a SoC. Every struct dev_power_domain object provides a sets of device power management callbacks that can be used to perform what's needed for device power management in addition to the operations carried out by the device's driver and subsystem. Namely, if a struct dev_power_domain object is pointed to by the pwr_domain field in a struct device, the callbacks provided by its ops member will be executed in addition to the corresponding callbacks provided by the device's subsystem and driver during all power transitions. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Tested-and-acked-by: Kevin Hilman <khilman@ti.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/device.h1
-rw-r--r--include/linux/pm.h8
2 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/device.h b/include/linux/device.h
index 1bf5cf0b451..22e9a8a7e1b 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -422,6 +422,7 @@ struct device {
void *platform_data; /* Platform specific data, device
core doesn't touch it */
struct dev_pm_info power;
+ struct dev_power_domain *pwr_domain;
#ifdef CONFIG_NUMA
int numa_node; /* NUMA node this device is close to */
diff --git a/include/linux/pm.h b/include/linux/pm.h
index 1f79c98f1e5..6618216bb97 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -465,6 +465,14 @@ struct dev_pm_info {
extern void update_pm_runtime_accounting(struct device *dev);
+/*
+ * Power domains provide callbacks that are executed during system suspend,
+ * hibernation, system resume and during runtime PM transitions along with
+ * subsystem-level and driver-level callbacks.
+ */
+struct dev_power_domain {
+ struct dev_pm_ops ops;
+};
/*
* The PM_EVENT_ messages are also used by drivers implementing the legacy