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dm: core: Add a way to iterate through children, probing each

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It is sometimes useful to process all children, making sure they are
probed first. Add functions to help with this and a macro to make it more
convenient.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2020-01-27 08:49:48 -07:00
parent f262d4ca4b
commit 903e83ee84
3 changed files with 80 additions and 0 deletions
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39
include/dm/device.h
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@@ -602,6 +602,28 @@ int device_first_child_ofdata_err(struct udevice *parent,
*/
int device_next_child_ofdata_err(struct udevice **devp);
/**
* device_first_child_err() - Get the first child of a device
*
* The device returned is probed if necessary, and ready for use
*
* @parent: Parent device to search
* @devp: Returns device found, if any
* @return 0 if found, -ENODEV if not, -ve error if device failed to probe
*/
int device_first_child_err(struct udevice *parent, struct udevice **devp);
/**
* device_next_child_err() - Get the next child of a parent device
*
* The device returned is probed if necessary, and ready for use
*
* @devp: On entry, pointer to device to lookup. On exit, returns pointer
* to the next sibling if no error occurred
* @return 0 if found, -ENODEV if not, -ve error if device failed to probe
*/
int device_next_child_err(struct udevice **devp);
/**
* device_has_children() - check if a device has any children
*
@@ -748,6 +770,23 @@ static inline bool device_is_on_pci_bus(const struct udevice *dev)
for (int _ret = device_first_child_ofdata_err(parent, &dev); !_ret; \
_ret = device_next_child_ofdata_err(&dev))
/**
* device_foreach_child_probe() - iterate through children, probing them
*
* This creates a for() loop which works through the available children of
* a device in order from start to end. Devices are probed if necessary,
* and ready for use.
*
* This stops when it gets an error, with @pos set to the device that failed to
* probe
*
* @pos: struct udevice * for the current device
* @parent: parent device to scan
*/
#define device_foreach_child_probe(pos, parent) \
for (int _ret = device_first_child_err(parent, &dev); !_ret; \
_ret = device_next_child_err(&dev))
/**
* dm_scan_fdt_dev() - Bind child device in a the device tree
*