dm: core: Allow uclass to set up a device's child after it is probed

Some buses need to set up their child devices after they are probed.
Support a common child_post_probe() method for the uclass.

With this change, the two APIs uclass_pre_probe_device() and
uclass_post_probe_device() become symmetric.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

2 files changed, 15 insertions, 2 deletions

diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index 3113d6a56b..3c7b9cf0ad 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -687,8 +687,19 @@ int uclass_pre_probe_device(struct udevice *dev)
 
 int uclass_post_probe_device(struct udevice *dev)
 {
-        struct uclass_driver *uc_drv = dev->uclass->uc_drv;
+        struct uclass_driver *uc_drv;
+        int ret;
+
+        if (dev->parent) {
+                uc_drv = dev->parent->uclass->uc_drv;
+                if (uc_drv->child_post_probe) {
+                        ret = uc_drv->child_post_probe(dev);
+                        if (ret)
+                                return ret;
+                }
+        }
 
+        uc_drv = dev->uclass->uc_drv;
         if (uc_drv->post_probe)
                 return uc_drv->post_probe(dev);
 
diff --git a/include/dm/uclass.h b/include/dm/uclass.h
index eebf2d5614..4ef0d0f0c0 100644
--- a/include/dm/uclass.h
+++ b/include/dm/uclass.h
@@ -61,7 +61,8 @@ struct udevice;
  * @post_probe: Called after a new device is probed
  * @pre_remove: Called before a device is removed
  * @child_post_bind: Called after a child is bound to a device in this uclass
- * @child_pre_probe: Called before a child is probed in this uclass
+ * @child_pre_probe: Called before a child in this uclass is probed
+ * @child_post_probe: Called after a child in this uclass is probed
  * @init: Called to set up the uclass
  * @destroy: Called to destroy the uclass
  * @priv_auto_alloc_size: If non-zero this is the size of the private data
@@ -94,6 +95,7 @@ struct uclass_driver {
         int (*pre_remove)(struct udevice *dev);
         int (*child_post_bind)(struct udevice *dev);
         int (*child_pre_probe)(struct udevice *dev);
+        int (*child_post_probe)(struct udevice *dev);
         int (*init)(struct uclass *class);
         int (*destroy)(struct uclass *class);
         int priv_auto_alloc_size;