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dm: core: Allow manual sequence numbering

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Some buses have their own rules which require assigning sequence numbers
with a bus-specific algorithm. For example, PCI requires that sub-buses
are numbered higher than their parent buses, meaning effectively that
parent buses must be numbered only after all of their child buses have
been numbered.

Add a uclass flag to indicate that driver model should not assign sequence
numbers. In this case, the uclass must do it.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-12-16 21:20:17 -07:00
parent 552da3357b
commit 15a1196be8
2 changed files with 4 additions and 1 deletions
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2
drivers/core/device.c
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@ -103,7 +103,7 @@ static int device_bind_common(struct udevice *parent, const struct driver *drv,
dev->req_seq = uclass_find_next_free_req_seq(uc);
}
}
if (auto_seq)
if (auto_seq && !(uc->uc_drv->flags & DM_UC_FLAG_NO_AUTO_SEQ))
dev->sqq = uclass_find_next_free_req_seq(uc);
if (drv->plat_auto) {

3
include/dm/uclass.h
View file

@ -44,6 +44,9 @@ struct udevice;
/* Members of this uclass sequence themselves with aliases */
#define DM_UC_FLAG_SEQ_ALIAS (1 << 0)
/* Members of this uclass without aliases don't get a sequence number */
#define DM_UC_FLAG_NO_AUTO_SEQ (1 << 1)
/* Same as DM_FLAG_ALLOC_PRIV_DMA */
#define DM_UC_FLAG_ALLOC_PRIV_DMA (1 << 5)