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authorSimon Glass <sjg@chromium.org>2014-07-23 06:55:14 -0600
committerSimon Glass <sjg@chromium.org>2014-07-23 14:07:25 +0100
commitf4cdead24a1a0c39c29c04e107c2f98ba61c5da8 (patch)
treecbabf26d3f1df2d80529543f5a4bcfeeef4a34f3 /drivers
parentb7d665705ebb29f06616b7f365ab8732e9779bf6 (diff)
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dm: Allow a device to be found by its FDT offset
Each device that was bound from a device tree has an node that caused it to be bound. Add functions that find and return a device based on a device tree offset. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/core/uclass.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index c28cf67..a27f3d5 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -187,6 +187,30 @@ int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
return -ENODEV;
}
+static int uclass_find_device_by_of_offset(enum uclass_id id, int node,
+ struct udevice **devp)
+{
+ struct uclass *uc;
+ struct udevice *dev;
+ int ret;
+
+ *devp = NULL;
+ if (node < 0)
+ return -ENODEV;
+ ret = uclass_get(id, &uc);
+ if (ret)
+ return ret;
+
+ list_for_each_entry(dev, &uc->dev_head, uclass_node) {
+ if (dev->of_offset == node) {
+ *devp = dev;
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+
/**
* uclass_get_device_tail() - handle the end of a get_device call
*
@@ -239,6 +263,17 @@ int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
return uclass_get_device_tail(dev, ret, devp);
}
+int uclass_get_device_by_of_offset(enum uclass_id id, int node,
+ struct udevice **devp)
+{
+ struct udevice *dev;
+ int ret;
+
+ *devp = NULL;
+ ret = uclass_find_device_by_of_offset(id, node, &dev);
+ return uclass_get_device_tail(dev, ret, devp);
+}
+
int uclass_first_device(enum uclass_id id, struct udevice **devp)
{
struct uclass *uc;