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authorThomas Abraham <thomas.abraham@linaro.org>2012-01-27 15:22:07 +0900
committerKukjin Kim <kgene.kim@samsung.com>2012-01-27 15:22:07 +0900
commitc8aa130b74cc5b112cb2b119d3b477abaaf6e5b2 (patch)
tree80ca3b93767b0aec09ed566924c196033ad12b49 /drivers/base
parentdcd6c92267155e70a94b3927bce681ce74b80d1f (diff)
downloadlinux-c8aa130b74cc5b112cb2b119d3b477abaaf6e5b2.tar.bz2
PM / Domains: Add OF support
A device node pointer is added to generic pm domain structure to associate the domain with a node in the device tree. The platform code parses the device tree to find available nodes representing the generic power domain, instantiates the available domains and initializes them by calling pm_genpd_init(). Nodes representing the devices include a phandle of the power domain to which it belongs. As these devices get instantiated, the driver code checkes for availability of a power domain phandle, converts the phandle to a device node and uses the new pm_genpd_of_add_device() api to associate the device with a power domain. pm_genpd_of_add_device() runs through its list of registered power domains and matches the OF node of the domain with the one specified as the parameter. If a match is found, the device is associated with the matched domain. Cc: Rob Herring <rob.herring@calxeda.com> Cc: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/domain.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 978bbf7ac6af..939109b75c9b 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1171,6 +1171,38 @@ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
}
/**
+ * __pm_genpd_of_add_device - Add a device to an I/O PM domain.
+ * @genpd_node: Device tree node pointer representing a PM domain to which the
+ * the device is added to.
+ * @dev: Device to be added.
+ * @td: Set of PM QoS timing parameters to attach to the device.
+ */
+int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev,
+ struct gpd_timing_data *td)
+{
+ struct generic_pm_domain *genpd = NULL, *gpd;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev))
+ return -EINVAL;
+
+ mutex_lock(&gpd_list_lock);
+ list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
+ if (gpd->of_node == genpd_node) {
+ genpd = gpd;
+ break;
+ }
+ }
+ mutex_unlock(&gpd_list_lock);
+
+ if (!genpd)
+ return -EINVAL;
+
+ return __pm_genpd_add_device(genpd, dev, td);
+}
+
+/**
* pm_genpd_remove_device - Remove a device from an I/O PM domain.
* @genpd: PM domain to remove the device from.
* @dev: Device to be removed.