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dm: core: Support finding a device by phandle

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It is common for one node to reference another via a phandle. Add support
for obtaining an attached device by this method. As an example, a node may
have a 'power-supply' property which references a regulator, allowing the
driver to turn on its power.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2015-07-02 18:15:38 -06:00
parent 389f1856bd
commit d82ba4c0b4
2 changed files with 59 additions and 0 deletions
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42
drivers/core/uclass.c
View File

@ -273,6 +273,37 @@ static int uclass_find_device_by_of_offset(enum uclass_id id, int node,
return -ENODEV;
}
static int uclass_find_device_by_phandle(enum uclass_id id,
struct udevice *parent,
const char *name,
struct udevice **devp)
{
struct udevice *dev;
struct uclass *uc;
int find_phandle;
int ret;
*devp = NULL;
find_phandle = fdtdec_get_int(gd->fdt_blob, parent->of_offset, name,
-1);
if (find_phandle <= 0)
return -ENOENT;
ret = uclass_get(id, &uc);
if (ret)
return ret;
list_for_each_entry(dev, &uc->dev_head, uclass_node) {
uint phandle = fdt_get_phandle(gd->fdt_blob, dev->of_offset);
if (phandle == find_phandle) {
*devp = dev;
return 0;
}
}
return -ENODEV;
}
int uclass_get_device_tail(struct udevice *dev, int ret,
struct udevice **devp)
{
@ -338,6 +369,17 @@ int uclass_get_device_by_of_offset(enum uclass_id id, int node,
return uclass_get_device_tail(dev, ret, devp);
}
int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
const char *name, struct udevice **devp)
{
struct udevice *dev;
int ret;
*devp = NULL;
ret = uclass_find_device_by_phandle(id, parent, name, &dev);
return uclass_get_device_tail(dev, ret, devp);
}
int uclass_first_device(enum uclass_id id, struct udevice **devp)
{
struct udevice *dev;

17
include/dm/uclass.h
View File

@ -176,6 +176,23 @@ int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp);
int uclass_get_device_by_of_offset(enum uclass_id id, int node,
struct udevice **devp);
/**
* uclass_get_device_by_phandle() - Get a uclass device by phandle
*
* This searches the devices in the uclass for one with the given phandle.
*
* The device is probed to activate it ready for use.
*
* @id: uclass ID to look up
* @parent: Parent device containing the phandle pointer
* @name: Name of property in the parent device node
* @devp: Returns pointer to device (there is only one for each node)
* @return 0 if OK, -ENOENT if there is no @name present in the node, other
* -ve on error
*/
int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
const char *name, struct udevice **devp);
/**
* uclass_first_device() - Get the first device in a uclass
*