ARM: OMAP: omap_device: remove omap_device_parent

Currently all omap_devices are forced to have the dummy device
'omap_device_parent' as a parent.  This was used to distinguish
omap_devices from "normal" platform_devices in the OMAP PM core code.

Now that we implement the PM core using PM domains, this is no longer
needed, and is removed.

This also frees up omap_devices to have a more complex parent/child
relationships that model actual device relationships.

The only in-tree user of omap_device_parent was the OMAP PM layer to
handle lost-context count for omap_devices.  That is now converted to
use the presence of the omap_device_pm_domain instead.

Signed-off-by: Kevin Hilman <khilman@ti.com>

arch/arm/plat-omap/include/plat/omap_device.h

@@ -36,7 +36,7 @@
 
 #include <plat/omap_hwmod.h>
 
-extern struct device omap_device_parent;
+extern struct dev_pm_domain omap_device_pm_domain;
 
 /* omap_device._state values */
 #define OMAP_DEVICE_STATE_UNKNOWN	0

arch/arm/plat-omap/omap-pm-noop.c

@@ -319,7 +319,7 @@ int omap_pm_get_dev_context_loss_count(struct device *dev)
 	if (WARN_ON(!dev))
 		return -ENODEV;
 
-	if (dev->parent == &omap_device_parent) {
+	if (dev->pm_domain == &omap_device_pm_domain) {
 		count = omap_device_get_context_loss_count(pdev);
 	} else {
 		WARN_ONCE(off_mode_enabled, "omap_pm: using dummy context loss counter; device %s should be converted to omap_device",

arch/arm/plat-omap/omap_device.c

@@ -314,8 +314,6 @@ static void _add_hwmod_clocks_clkdev(struct omap_device *od,
 }
 
 
-static struct dev_pm_domain omap_device_pm_domain;
-
 /**
  * omap_device_build_from_dt - build an omap_device with multiple hwmods
  * @pdev_name: name of the platform_device driver to use
@@ -793,7 +791,7 @@ static int _od_resume_noirq(struct device *dev)
 #define _od_resume_noirq NULL
 #endif
 
-static struct dev_pm_domain omap_device_pm_domain = {
+struct dev_pm_domain omap_device_pm_domain = {
 	.ops = {
 		SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
 				   _od_runtime_idle)
@@ -815,7 +813,6 @@ int omap_device_register(struct platform_device *pdev)
 {
 	pr_debug("omap_device: %s: registering\n", pdev->name);
 
-	pdev->dev.parent = &omap_device_parent;
 	pdev->dev.pm_domain = &omap_device_pm_domain;
 	return platform_device_add(pdev);
 }
@@ -1124,18 +1121,13 @@ int omap_device_enable_clocks(struct omap_device *od)
 	return 0;
 }
 
-struct device omap_device_parent = {
-	.init_name	= "omap",
-	.parent         = &platform_bus,
-};
-
 static struct notifier_block platform_nb = {
 	.notifier_call = _omap_device_notifier_call,
 };
 
 static int __init omap_device_init(void)
 {
 	bus_register_notifier(&platform_bus_type, &platform_nb);
-	return device_register(&omap_device_parent);
+	return 0;
 }
 core_initcall(omap_device_init);