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dm: core: Allow parents to pass data to children during probe

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Buses sometimes want to pass data to their children when they are probed.
For example, a SPI bus may want to tell the slave device about the chip
select it is connected to.

Add a new function to permit the parent data to be supplied to the child.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
This commit is contained in:
Simon Glass
2014-10-13 23:41:50 -06:00
parent a8981d4f80
commit accd4b19b3
3 changed files with 25 additions and 1 deletions
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13
include/dm/device-internal.h
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@@ -65,6 +65,19 @@ int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
*/
int device_probe(struct udevice *dev);
/**
* device_probe() - Probe a child device, activating it
*
* Activate a device so that it is ready for use. All its parents are probed
* first. The child is provided with parent data if parent_priv is not NULL.
*
* @dev: Pointer to device to probe
* @parent_priv: Pointer to parent data. If non-NULL then this is provided to
* the child.
* @return 0 if OK, -ve on error
*/
int device_probe_child(struct udevice *dev, void *parent_priv);
/**
* device_remove() - Remove a device, de-activating it
*