dm: core: Extend struct udevice by '.uclass_platdata' field.

This commit adds 'uclass_platdata' field to 'struct udevice', which
can be automatically allocated at bind. The allocation size is defined
in 'struct uclass_driver' as 'per_device_platdata_auto_alloc_size'.

New device's flag is added: DM_FLAG_ALLOC_UCLASS_PDATA, which is used
for memory freeing at device unbind method.

As for other udevice's fields, a complementary function is added:
- dev_get_uclass_platdata()

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>

2 files changed, 20 insertions, 1 deletions

diff --git a/include/dm/device.h b/include/dm/device.h
index c11342c..ad002fe 100644
--- a/include/dm/device.h
+++ b/include/dm/device.h
@@ -30,8 +30,11 @@ struct driver_info;
 /* DM is responsible for allocating and freeing parent_platdata */
 #define DM_FLAG_ALLOC_PARENT_PDATA	(1 << 3)
 
+/* DM is responsible for allocating and freeing uclass_platdata */
+#define DM_FLAG_ALLOC_UCLASS_PDATA	(1 << 4)
+
 /* Allocate driver private data on a DMA boundary */
-#define DM_FLAG_ALLOC_PRIV_DMA	(1 << 4)
+#define DM_FLAG_ALLOC_PRIV_DMA	(1 << 5)
 
 /**
  * struct udevice - An instance of a driver
@@ -54,6 +57,7 @@ struct driver_info;
  * @name: Name of device, typically the FDT node name
  * @platdata: Configuration data for this device
  * @parent_platdata: The parent bus's configuration data for this device
+ * @uclass_platdata: The uclass's configuration data for this device
  * @of_offset: Device tree node offset for this device (- for none)
  * @driver_data: Driver data word for the entry that matched this device with
  *		its driver
@@ -75,6 +79,7 @@ struct udevice {
 	const char *name;
 	void *platdata;
 	void *parent_platdata;
+	void *uclass_platdata;
 	int of_offset;
 	ulong driver_data;
 	struct udevice *parent;
@@ -210,6 +215,16 @@ void *dev_get_platdata(struct udevice *dev);
 void *dev_get_parent_platdata(struct udevice *dev);
 
 /**
+ * dev_get_uclass_platdata() - Get the uclass platform data for a device
+ *
+ * This checks that dev is not NULL, but no other checks for now
+ *
+ * @dev		Device to check
+ * @return uclass's platform data, or NULL if none
+ */
+void *dev_get_uclass_platdata(struct udevice *dev);
+
+/**
  * dev_get_parentdata() - Get the parent data for a device
  *
  * The parent data is data stored in the device but owned by the parent.
diff --git a/include/dm/uclass.h b/include/dm/uclass.h
index d57d804..b271472 100644
--- a/include/dm/uclass.h
+++ b/include/dm/uclass.h
@@ -65,6 +65,9 @@ struct udevice;
  * @per_device_auto_alloc_size: Each device can hold private data owned
  * by the uclass. If required this will be automatically allocated if this
  * value is non-zero.
+ * @per_device_platdata_auto_alloc_size: Each device can hold platform data
+ * owned by the uclass as 'dev->uclass_platdata'. If the value is non-zero,
+ * then this will be automatically allocated.
  * @per_child_auto_alloc_size: Each child device (of a parent in this
  * uclass) can hold parent data for the device/uclass. This value is only
  * used as a falback if this member is 0 in the driver.
@@ -90,6 +93,7 @@ struct uclass_driver {
 	int (*destroy)(struct uclass *class);
 	int priv_auto_alloc_size;
 	int per_device_auto_alloc_size;
+	int per_device_platdata_auto_alloc_size;
 	int per_child_auto_alloc_size;
 	int per_child_platdata_auto_alloc_size;
 	const void *ops;