driver core: Add ability for arch code to setup pdev_archdata

On some architectures we need to setup pdev_archdata before we add the
device. Waiting til a bus_notifier is too late since we might need the
pdev_archdata in the bus notifier. One example is setting up of dma_mask
pointers such that it can be used in a bus_notifier.

We add weak noop version of arch_setup_pdev_archdata() and allow the arch
code to override with access the full definitions of struct device,
struct platform_device, and struct pdev_archdata.

Acked-by: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: Kumar Gala <[e-mail]>

drivers/base/platform.c

···
 EXPORT_SYMBOL_GPL(platform_bus);
 
 /**
+ * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
+ * @dev: platform device
+ *
+ * This is called before platform_device_add() such that any pdev_archdata may
+ * be setup before the platform_notifier is called.  So if a user needs to
+ * manipulate any relevant information in the pdev_archdata they can do:
+ *
+ * 	platform_devic_alloc()
+ * 	... manipulate ...
+ * 	platform_device_add()
+ *
+ * And if they don't care they can just call platform_device_register() and
+ * everything will just work out.
+ */
+void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
+{
+}
+
+/**
  * platform_get_resource - get a resource for a device
  * @dev: platform device
  * @type: resource type
···
 		pa->pdev.id = id;
 		device_initialize(&pa->pdev.dev);
 		pa->pdev.dev.release = platform_device_release;
+		arch_setup_pdev_archdata(&pa->pdev);
 	}
 
 	return pa ? &pa->pdev : NULL;
···
 int platform_device_register(struct platform_device *pdev)
 {
 	device_initialize(&pdev->dev);
+	arch_setup_pdev_archdata(pdev);
 	return platform_device_add(pdev);
 }
 EXPORT_SYMBOL_GPL(platform_device_register);

include/linux/platform_device.h

···
 extern struct bus_type platform_bus_type;
 extern struct device platform_bus;
 
+extern void arch_setup_pdev_archdata(struct platform_device *);
 extern struct resource *platform_get_resource(struct platform_device *, unsigned int, unsigned int);
 extern int platform_get_irq(struct platform_device *, unsigned int);
 extern struct resource *platform_get_resource_byname(struct platform_device *, unsigned int, const char *);