[U-Boot] [PATCH v2 1/2] core: add uclass_get_device_by_phandle_id() api

[Kever Yang]

Add api for who can not get phandle from a device property.

Signed-off-by: Kever Yang <kever.yang at rock-chips.com>
---

Changes in v2:
- use uint instead of int for phandle
- address comment from Philipp

 drivers/core/uclass.c | 26 ++++++++++++++++++++++++++
 include/dm/uclass.h   | 16 ++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index f5e4067..274b833 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -443,6 +443,32 @@ int uclass_get_device_by_ofnode(enum uclass_id id, ofnode node,
 }
 
 #if CONFIG_IS_ENABLED(OF_CONTROL)
+int uclass_get_device_by_phandle_id(enum uclass_id id, uint phandle_id,
+				    struct udevice **devp)
+{
+	struct udevice *dev;
+	struct uclass *uc;
+	int ret;
+
+	*devp = NULL;
+	ret = uclass_get(id, &uc);
+	if (ret)
+		return ret;
+
+	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
+		uint phandle;
+
+		phandle = dev_read_phandle(dev);
+
+		if (phandle == phandle_id) {
+			*devp = dev;
+			return uclass_get_device_tail(dev, ret, devp);
+		}
+	}
+
+	return -ENODEV;
+}
+
 int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
 				 const char *name, struct udevice **devp)
 {
diff --git a/include/dm/uclass.h b/include/dm/uclass.h
index 1818849..63cb6e9 100644
--- a/include/dm/uclass.h
+++ b/include/dm/uclass.h
@@ -203,6 +203,22 @@ int uclass_get_device_by_ofnode(enum uclass_id id, ofnode node,
 				struct udevice **devp);
 
 /**
+ * uclass_get_device_by_phandle_id() - Get a uclass device by phandle id
+ *
+ * This searches the devices in the uclass for one with the given phandle id.
+ *
+ * The device is probed to activate it ready for use.
+ *
+ * @id: uclass ID to look up
+ * @phandle_id: the phandle id to look up
+ * @devp: Returns pointer to device (there is only one for each node)
+ * @return 0 if OK, -ENODEV if there is no device match the phandle, other
+ *	-ve on error
+ */
+int uclass_get_device_by_phandle_id(enum uclass_id id, uint phandle_id,
+				    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.
-- 
1.9.1