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Subject[PATCH 04/12] platform: provide a separate function for initializing platform devices
Date
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

The early platform driver framework will allocate platform devices
using its own internal mechanisms. Provide a function that allows to
initialize a platform device object without allocating it.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
drivers/base/platform.c | 24 ++++++++++++++++++++----
include/linux/platform_device.h | 2 ++
2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 0c53e3e3e5aa..0ba4effb9618 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -252,6 +252,25 @@ static void platform_device_release(struct device *dev)
kfree(pa);
}

+/**
+ * platform_device_init - initialize a platform device
+ * @pdev: platform device to initialize
+ * @name: base name of the device we're adding, NOTE: it's not copied
+ * @id: instance id
+ *
+ * Initiate an already allocated platform device. This routine does not set
+ * the release device callback.
+ */
+void platform_device_init(struct platform_device *pdev,
+ const char *name, int id)
+{
+ pdev->name = name;
+ pdev->id = id;
+ device_initialize(&pdev->dev);
+ arch_setup_pdev_archdata(pdev);
+}
+EXPORT_SYMBOL_GPL(platform_device_init);
+
/**
* platform_device_alloc - create a platform device
* @name: base name of the device we're adding
@@ -267,11 +286,8 @@ struct platform_device *platform_device_alloc(const char *name, int id)
pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
if (pa) {
strcpy(pa->name, name);
- pa->pdev.name = pa->name;
- pa->pdev.id = id;
- device_initialize(&pa->pdev.dev);
+ platform_device_init(&pa->pdev, pa->name, id);
pa->pdev.dev.release = platform_device_release;
- arch_setup_pdev_archdata(&pa->pdev);
}

return pa ? &pa->pdev : NULL;
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 099aaf804b50..46bfd5ff666f 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -165,6 +165,8 @@ static inline struct platform_device *platform_device_register_data(
NULL, 0, data, size);
}

+extern void platform_device_init(struct platform_device *pdev,
+ const char *name, int id);
extern struct platform_device *platform_device_alloc(const char *name, int id);
extern int platform_device_add_resources(struct platform_device *pdev,
const struct resource *res,
--
2.17.0
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