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authorUlf Hansson <ulf.hansson@linaro.org>2018-05-31 13:59:58 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2018-06-06 10:09:21 +0300
commit3c095f32a92be4d07f3172a777dab1aacdb6a728 (patch)
treeea334bb4accb94d8d1da1bed00b0d7a9cd69c211 /include/linux/pm_domain.h
parent8cb1cbd644d5bba5b72eedd632f249c1c677b792 (diff)
downloadlinux-3c095f32a92be4d07f3172a777dab1aacdb6a728.tar.xz
PM / Domains: Add support for multi PM domains per device to genpd
To support devices being partitioned across multiple PM domains, let's begin with extending genpd to cope with these kind of configurations. Therefore, add a new exported function genpd_dev_pm_attach_by_id(), which is similar to the existing genpd_dev_pm_attach(), but with the difference that it allows its callers to provide an index to the PM domain that it wants to attach. Note that, genpd_dev_pm_attach_by_id() shall only be called by the driver core / PM core, similar to how the existing dev_pm_domain_attach() makes use of genpd_dev_pm_attach(). However, this is implemented by following changes on top. Because, only one PM domain can be attached per device, genpd needs to create a virtual device that it can attach/detach instead. More precisely, let the new function genpd_dev_pm_attach_by_id() register a virtual struct device via calling device_register(). Then let it attach this device to the corresponding PM domain, rather than the one that is provided by the caller. The actual attaching is done via re-using the existing genpd OF functions. At successful attachment, genpd_dev_pm_attach_by_id() returns the created virtual device, which allows the caller to operate on it to deal with power management. Following changes on top, provides more details in this regards. To deal with detaching of a PM domain for the multiple PM domains case, let's also extend the existing genpd_dev_pm_detach() function, to cover the cleanup of the created virtual device, via make it call device_unregister() on it. In this way, there is no need to introduce a new function to deal with detach for the multiple PM domain case, but instead the existing one is re-used. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/pm_domain.h')
-rw-r--r--include/linux/pm_domain.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 42e0d649e653..82458e8e2e01 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -237,6 +237,8 @@ unsigned int of_genpd_opp_to_performance_state(struct device *dev,
struct device_node *opp_node);
int genpd_dev_pm_attach(struct device *dev);
+struct device *genpd_dev_pm_attach_by_id(struct device *dev,
+ unsigned int index);
#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
static inline int of_genpd_add_provider_simple(struct device_node *np,
struct generic_pm_domain *genpd)
@@ -282,6 +284,12 @@ static inline int genpd_dev_pm_attach(struct device *dev)
return 0;
}
+static inline struct device *genpd_dev_pm_attach_by_id(struct device *dev,
+ unsigned int index)
+{
+ return NULL;
+}
+
static inline
struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
{