[U-Boot] [PATCH v4 03/11] dm: uclass: Add uclass_next_device_err() to return a valid device

[Patrice Chotard]

Similarly to uclass_first_device_err(), add uclass_next_device_err()
which returns an error if there are no next devices in that uclass.

Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
---

Changes in v4: None
Changes in v3: None
Changes in v2: None

 drivers/core/uclass.c | 13 +++++++++++++
 include/dm/uclass.h   | 12 ++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index 3113d6a56ba3..a4452bd9b313 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -562,6 +562,19 @@ int uclass_next_device(struct udevice **devp)
 	return uclass_get_device_tail(dev, ret, devp);
 }
 
+int uclass_next_device_err(struct udevice **devp)
+{
+	int ret;
+
+	ret = uclass_next_device(devp);
+	if (ret)
+		return ret;
+	else if (!*devp)
+		return -ENODEV;
+
+	return 0;
+}
+
 int uclass_first_device_check(enum uclass_id id, struct udevice **devp)
 {
 	int ret;
diff --git a/include/dm/uclass.h b/include/dm/uclass.h
index eebf2d5614c4..39d0fdb540e9 100644
--- a/include/dm/uclass.h
+++ b/include/dm/uclass.h
@@ -306,6 +306,18 @@ int uclass_first_device_err(enum uclass_id id, struct udevice **devp);
 int uclass_next_device(struct udevice **devp);
 
 /**
+ * uclass_next_device_err() - Get the next device in a uclass
+ *
+ * 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 device in the uclass if no error occurred, or -ENODEV if
+ * there is no next device.
+ * @return 0 if found, -ENODEV if not found, other -ve on error
+ */
+int uclass_next_device_err(struct udevice **devp);
+
+/**
  * uclass_first_device_check() - Get the first device in a uclass
  *
  * The device returned is probed if necessary, and ready for use
-- 
1.9.1