dm: core: Allow parents to pass data to children during probe
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>
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@ -232,7 +232,7 @@ static void device_free(struct udevice *dev)
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}
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}
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int device_probe(struct udevice *dev)
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int device_probe_child(struct udevice *dev, void *parent_priv)
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{
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struct driver *drv;
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int size = 0;
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@ -282,6 +282,8 @@ int device_probe(struct udevice *dev)
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ret = -ENOMEM;
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goto fail;
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}
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if (parent_priv)
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memcpy(dev->parent_priv, parent_priv, size);
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}
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ret = device_probe(dev->parent);
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@ -335,6 +337,11 @@ fail:
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return ret;
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}
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int device_probe(struct udevice *dev)
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{
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return device_probe_child(dev, NULL);
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}
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int device_remove(struct udevice *dev)
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{
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struct driver *drv;
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@ -65,6 +65,19 @@ int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
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*/
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int device_probe(struct udevice *dev);
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/**
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* device_probe() - Probe a child device, activating it
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*
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* Activate a device so that it is ready for use. All its parents are probed
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* first. The child is provided with parent data if parent_priv is not NULL.
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*
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* @dev: Pointer to device to probe
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* @parent_priv: Pointer to parent data. If non-NULL then this is provided to
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* the child.
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* @return 0 if OK, -ve on error
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*/
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int device_probe_child(struct udevice *dev, void *parent_priv);
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/**
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* device_remove() - Remove a device, de-activating it
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*
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@ -139,6 +139,10 @@ struct udevice_id {
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* @per_child_auto_alloc_size: Each device can hold private data owned by
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* its parent. If required this will be automatically allocated if this
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* value is non-zero.
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* TODO(sjg@chromium.org): I'm considering dropping this, and just having
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* device_probe_child() pass it in. So far the use case for allocating it
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* is SPI, but I found that unsatisfactory. Since it is here I will leave it
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* until things are clearer.
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* @ops: Driver-specific operations. This is typically a list of function
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* pointers defined by the driver, to implement driver functions required by
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* the uclass.
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