[U-Boot] [PATCH v1 03/19] dm: device: Allow using uclass_find_device_by_seq() without OF_CONTROL

[Jean-Jacques Hiblot]

If OF_CONTROL is not enabled and DM_SEQ_ALIAS is enabled, we must
assign an alias (requested sequence number) to devices that belongs to a
class with the DM_UC_FLAG_SEQ_ALIAS flag. Otherwise
uclass_find_device_by_seq() cannot be used to get/probe a device. In
particular i2c_get_chip_for_busnum() cannot be used.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot at ti.com>
---

 drivers/core/device.c        | 10 ++++++----
 drivers/core/uclass.c        | 24 ++++++++++++++++++++++++
 include/dm/uclass-internal.h | 13 +++++++++++++
 3 files changed, 43 insertions(+), 4 deletions(-)

diff --git a/drivers/core/device.c b/drivers/core/device.c
index feed43c..e441021 100644
--- a/drivers/core/device.c
+++ b/drivers/core/device.c
@@ -70,7 +70,8 @@ static int device_bind_common(struct udevice *parent, const struct driver *drv,
 
 	dev->seq = -1;
 	dev->req_seq = -1;
-	if (CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_SEQ_ALIAS)) {
+	if (CONFIG_IS_ENABLED(DM_SEQ_ALIAS) &&
+	    (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS)) {
 		/*
 		 * Some devices, such as a SPI bus, I2C bus and serial ports
 		 * are numbered using aliases.
@@ -78,10 +79,11 @@ static int device_bind_common(struct udevice *parent, const struct driver *drv,
 		 * This is just a 'requested' sequence, and will be
 		 * resolved (and ->seq updated) when the device is probed.
 		 */
-		if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
-			if (uc->uc_drv->name && ofnode_valid(node)) {
+		if (CONFIG_IS_ENABLED(OF_CONTROL)) {
+			if (uc->uc_drv->name && ofnode_valid(node))
 				dev_read_alias_seq(dev, &dev->req_seq);
-			}
+		} else {
+			dev->req_seq = uclass_find_next_free_req_seq(drv->id);
 		}
 	}
 
diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index 3113d6a..376f882 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -269,6 +269,30 @@ int uclass_find_device_by_name(enum uclass_id id, const char *name,
 	return -ENODEV;
 }
 
+#if !CONFIG_IS_ENABLED(OF_CONTROL)
+int uclass_find_next_free_req_seq(enum uclass_id id)
+{
+	struct uclass *uc;
+	struct udevice *dev;
+	int ret;
+	int max = -1;
+
+	ret = uclass_get(id, &uc);
+	if (ret)
+		return ret;
+
+	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
+		if ((dev->req_seq != -1) && (dev->req_seq > max))
+			max = dev->req_seq;
+	}
+
+	if (max == -1)
+		return 0;
+
+	return max + 1;
+}
+#endif
+
 int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
 			      bool find_req_seq, struct udevice **devp)
 {
diff --git a/include/dm/uclass-internal.h b/include/dm/uclass-internal.h
index 30d5a4f..18a838c 100644
--- a/include/dm/uclass-internal.h
+++ b/include/dm/uclass-internal.h
@@ -12,6 +12,19 @@
 #include <dm/ofnode.h>
 
 /**
+ * uclass_find_next_free_req_seq() - Get the next free req_seq number
+ *
+ * This returns the next free req_seq number. This is useful only if
+ * OF_CONTROL is not used. The next free req_seq number is simply the
+ * maximum req_seq of the uclass + 1.
+ * This allows assiging req_seq number in the binding order.
+ *
+ * @id:		Id number of the uclass
+ * @return	The next free req_seq number
+ */
+int uclass_find_next_free_req_seq(enum uclass_id id);
+
+/**
  * uclass_get_device_tail() - handle the end of a get_device call
  *
  * This handles returning an error or probing a device as needed.
-- 
2.7.4