PM / Domains: Allow OF lookup for multi PM domain case from ->attach_dev()

A genpd provider that uses the ->attach_dev() callback to look up
resources for a device fails to do so when the device has multiple
PM domains attached.  That is because when genpd invokes the
->attach_dev() callback, it passes the allocated virtual device as
the in-parameter.

To address this problem, simply assign the dev->of_node for the
virtual device, based upon the original device's OF node.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 5422fc0..a0b021d 100644 (file)
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2272,6 +2272,7 @@ EXPORT_SYMBOL_GPL(of_genpd_remove_last);
 
 static void genpd_release_dev(struct device *dev)
 {
+       of_node_put(dev->of_node);
        kfree(dev);
 }
 
@@ -2333,14 +2334,14 @@ static void genpd_dev_pm_sync(struct device *dev)
        genpd_queue_power_off_work(pd);
 }
 
-static int __genpd_dev_pm_attach(struct device *dev, struct device_node *np,
-                                unsigned int index, bool power_on)
+static int __genpd_dev_pm_attach(struct device *dev, unsigned int index,
+                                bool power_on)
 {
        struct of_phandle_args pd_args;
        struct generic_pm_domain *pd;
        int ret;
 
-       ret = of_parse_phandle_with_args(np, "power-domains",
+       ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
                                "#power-domain-cells", index, &pd_args);
        if (ret < 0)
                return ret;
@@ -2408,7 +2409,7 @@ int genpd_dev_pm_attach(struct device *dev)
                                       "#power-domain-cells") != 1)
                return 0;
 
-       return __genpd_dev_pm_attach(dev, dev->of_node, 0, true);
+       return __genpd_dev_pm_attach(dev, 0, true);
 }
 EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
 
@@ -2452,6 +2453,7 @@ struct device *genpd_dev_pm_attach_by_id(struct device *dev,
        dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev));
        virt_dev->bus = &genpd_bus_type;
        virt_dev->release = genpd_release_dev;
+       virt_dev->of_node = of_node_get(dev->of_node);
 
        ret = device_register(virt_dev);
        if (ret) {
@@ -2460,7 +2462,7 @@ struct device *genpd_dev_pm_attach_by_id(struct device *dev,
        }
 
        /* Try to attach the device to the PM domain at the specified index. */
-       ret = __genpd_dev_pm_attach(virt_dev, dev->of_node, index, false);
+       ret = __genpd_dev_pm_attach(virt_dev, index, false);
        if (ret < 1) {
                device_unregister(virt_dev);
                return ret ? ERR_PTR(ret) : NULL;