From a133e2179a729036e7750b497c1c38f9f6a3a835 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Wed, 16 Dec 2020 21:20:30 -0700
Subject: [PATCH] dm: core: Update uclass_find_next_free_req_seq() for new
 scheme

This function current deals with req_seq which is deprecated. Update it to
use the new sequence numbers, putting them above existing aliases. Rename
the function to make this clear.

Signed-off-by: Simon Glass <sjg@chromium.org>
---
 drivers/core/device.c        |  8 ++------
 drivers/core/uclass.c        | 21 ++++++++++++++-------
 drivers/pci/pci-uclass.c     |  2 +-
 include/dm/uclass-internal.h | 17 ++++++++++-------
 4 files changed, 27 insertions(+), 21 deletions(-)

diff --git a/drivers/core/device.c b/drivers/core/device.c
index b878a4d4b6..4abb5be56a 100644
--- a/drivers/core/device.c
+++ b/drivers/core/device.c
@@ -93,18 +93,14 @@ static int device_bind_common(struct udevice *parent, const struct driver *drv,
 			}
 			if (CONFIG_IS_ENABLED(OF_PRIOR_STAGE)) {
 				if (dev->req_seq == -1) {
-					auto_seq = true;
 					dev->req_seq =
-						uclass_find_next_free_req_seq(
-							uc);
+						uclass_find_next_free_seq(uc);
 				}
 			}
-		} else {
-			dev->req_seq = uclass_find_next_free_req_seq(uc);
 		}
 	}
 	if (auto_seq && !(uc->uc_drv->flags & DM_UC_FLAG_NO_AUTO_SEQ))
-		dev->sqq = uclass_find_next_free_req_seq(uc);
+		dev->sqq = uclass_find_next_free_seq(uc);
 
 	if (drv->plat_auto) {
 		bool alloc = !plat;
diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index 42c9ba5828..6409457fa9 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -272,18 +272,25 @@ int uclass_find_device_by_name(enum uclass_id id, const char *name,
 	return -ENODEV;
 }
 
-int uclass_find_next_free_req_seq(struct uclass *uc)
+int uclass_find_next_free_seq(struct uclass *uc)
 {
 	struct udevice *dev;
 	int max = -1;
 
-	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
-		if ((dev->req_seq != -1) && (dev->req_seq > max))
-			max = dev->req_seq;
-	}
+	/* If using aliases, start with the highest alias value */
+	if (CONFIG_IS_ENABLED(DM_SEQ_ALIAS) &&
+	    (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS))
+		max = dev_read_alias_highest_id(uc->uc_drv->name);
 
-	if (max == -1)
-		return 0;
+	/* Avoid conflict with existing devices */
+	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
+		if (dev->sqq > max)
+			max = dev->sqq;
+	}
+	/*
+	 * At this point, max will be -1 if there are no existing aliases or
+	 * devices
+	 */
 
 	return max + 1;
 }
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index bff183eea2..914217d0c9 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -1019,7 +1019,7 @@ static int pci_uclass_pre_probe(struct udevice *bus)
 		ret = uclass_get(UCLASS_PCI, &uc);
 		if (ret)
 			return ret;
-		bus->sqq = uclass_find_next_free_req_seq(uc);
+		bus->sqq = uclass_find_next_free_seq(uc);
 	}
 
 	/* For bridges, use the top-level PCI controller */
diff --git a/include/dm/uclass-internal.h b/include/dm/uclass-internal.h
index 9c23d3f223..3e052f95d3 100644
--- a/include/dm/uclass-internal.h
+++ b/include/dm/uclass-internal.h
@@ -12,17 +12,20 @@
 #include <dm/ofnode.h>
 
 /**
- * uclass_find_next_free_req_seq() - Get the next free req_seq number
+ * uclass_find_next_free_seq() - Get the next free sequence 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.
+ * This returns the next free sequence number. This is useful only if
+ * OF_CONTROL is not used. The next free sequence number is simply the
+ * maximum sequence number used by all devices in the uclass + 1. The value
+ * returned is always greater than the largest alias, if DM_SEQ_ALIAS is enabled
+ * and the uclass has the DM_UC_FLAG_SEQ_ALIAS flag.
+ *
+ * This allows assigning the sequence number in the binding order.
  *
  * @uc:		uclass to check
- * @return	The next free req_seq number
+ * @return	The next free sequence number
  */
-int uclass_find_next_free_req_seq(struct uclass *uc);
+int uclass_find_next_free_seq(struct uclass *uc);
 
 /**
  * uclass_get_device_tail() - handle the end of a get_device call