| Message ID | 1417171115-5789-1-git-send-email-ulf.hansson@linaro.org |
|---|---|
| State | New |
| Headers | show |
On 29 November 2014 at 01:30, Rafael J. Wysocki <rjw@rjwysocki.net> wrote: > On Friday, November 28, 2014 11:38:35 AM Ulf Hansson wrote: >> In a step to move away from using genpd's name based APIs, such as the >> pm_genpd_add_subdomain_names(), provide an API to lookup an already >> initialized generic PM domain by its firmware node. >> >> This API would typically be a called from SOC specific code, to fetch a >> handle to the domain. Especially convenient to configure subdomains and >> when the hierarchy of the domains are described in DT. >> >> Do note, before pm_genpd_init() is invoked to initialize a generic PM >> domain, it's the callers responsibility to assign the new ->fwnode >> pointer in the struct generic_pm_domain, to enable pm_genpd_lookup() to >> find the domain. >> >> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> > > I have no problems with that, but do you have a user for it? Amit Daniel Kachhap, posted a patchset which is adding subdomains configured from DT for Exynos. It's from there the idea to this patch comes from. Amit is about to post a new version, based on this patch. https://lkml.org/lkml/2014/11/24/290 Kind regards Uffe -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 1 December 2014 at 12:57, amit daniel kachhap <amit.daniel@samsung.com> wrote: > On Mon, Dec 1, 2014 at 3:56 PM, Ulf Hansson <ulf.hansson@linaro.org> wrote: >> On 29 November 2014 at 01:30, Rafael J. Wysocki <rjw@rjwysocki.net> wrote: >>> On Friday, November 28, 2014 11:38:35 AM Ulf Hansson wrote: >>>> In a step to move away from using genpd's name based APIs, such as the >>>> pm_genpd_add_subdomain_names(), provide an API to lookup an already >>>> initialized generic PM domain by its firmware node. >>>> >>>> This API would typically be a called from SOC specific code, to fetch a >>>> handle to the domain. Especially convenient to configure subdomains and >>>> when the hierarchy of the domains are described in DT. >>>> >>>> Do note, before pm_genpd_init() is invoked to initialize a generic PM >>>> domain, it's the callers responsibility to assign the new ->fwnode >>>> pointer in the struct generic_pm_domain, to enable pm_genpd_lookup() to >>>> find the domain. >>>> >>>> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> >>> >>> I have no problems with that, but do you have a user for it? >> >> Amit Daniel Kachhap, posted a patchset which is adding subdomains >> configured from DT for Exynos. It's from there the idea to this patch >> comes from. Amit is about to post a new version, based on this patch. > > Hi Ulf, > > I was trying to use this API but i felt there is a better way of just exporting > of_genpd_get_from_provider as a similar API is used to register the > power domain. > > Check if this make sense www.spinics.net/lists/arm-kernel/msg382665.html. > That makes sense! So, let's drop $subject patch. Kind regards Uffe -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 735c473..2d881d5 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -75,6 +75,33 @@ struct generic_pm_domain *dev_to_genpd(struct device *dev) return pd_to_genpd(dev->pm_domain); } +/** + * pm_genpd_lookup - Fetch a generic PM domain object by firmware node. + * @node: Firmware node to a corresponding genpd. + * + * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() + * on failure. + */ +struct generic_pm_domain *pm_genpd_lookup(struct fwnode_handle *node) +{ + struct generic_pm_domain *genpd = ERR_PTR(-ENOENT), *gpd; + + if (IS_ERR_OR_NULL(node)) + return ERR_PTR(-EINVAL); + + mutex_lock(&gpd_list_lock); + list_for_each_entry(gpd, &gpd_list, gpd_list_node) { + if (gpd->fwnode == node) { + genpd = gpd; + break; + } + } + mutex_unlock(&gpd_list_lock); + + return genpd; +} +EXPORT_SYMBOL_GPL(pm_genpd_lookup); + static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) { return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 8cbd32e..aa01050 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -43,6 +43,8 @@ struct gpd_cpuidle_data { struct cpuidle_state *idle_state; }; +struct fwnode_handle; + struct generic_pm_domain { struct dev_pm_domain domain; /* PM domain operations */ struct list_head gpd_list_node; /* Node in the global PM domains list */ @@ -53,6 +55,7 @@ struct generic_pm_domain { struct dev_power_governor *gov; struct work_struct power_off_work; const char *name; + struct fwnode_handle *fwnode; /* Firware node for the PM domain */ unsigned int in_progress; /* Number of devices being suspended now */ atomic_t sd_count; /* Number of subdomains with power "on" */ enum gpd_status status; /* Current state of the domain */ @@ -126,6 +129,7 @@ static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev) } extern struct generic_pm_domain *dev_to_genpd(struct device *dev); +extern struct generic_pm_domain *pm_genpd_lookup(struct fwnode_handle *node); extern int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, struct gpd_timing_data *td);
In a step to move away from using genpd's name based APIs, such as the pm_genpd_add_subdomain_names(), provide an API to lookup an already initialized generic PM domain by its firmware node. This API would typically be a called from SOC specific code, to fetch a handle to the domain. Especially convenient to configure subdomains and when the hierarchy of the domains are described in DT. Do note, before pm_genpd_init() is invoked to initialize a generic PM domain, it's the callers responsibility to assign the new ->fwnode pointer in the struct generic_pm_domain, to enable pm_genpd_lookup() to find the domain. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> --- Changes in v2: Change from using struct device_node to struct fwnode_handle. Updated commit header accordingly. --- drivers/base/power/domain.c | 27 +++++++++++++++++++++++++++ include/linux/pm_domain.h | 4 ++++ 2 files changed, 31 insertions(+)