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dm: core: allow drivers to refuse to bind

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In some cases, drivers may not want to bind to a device. Allow bind() to
return -ENODEV in this case, and don't treat this as an error. This can
be useful in situations where some information source other than the DT
node's main status property indicates whether the device should be
enabled, for example other DT properties might indicate this, or the
driver might query non-DT sources such as system fuses or a version number
register.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Stephen Warren 2016-04-19 16:19:29 -06:00 committed by Simon Glass
parent f79f1e0c0e
commit 9fdfadf8fc
1 changed files with 4 additions and 0 deletions
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4
drivers/core/lists.c
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@ -171,6 +171,10 @@ int lists_bind_fdt(struct udevice *parent, const void *blob, int offset,
dm_dbg(" - found match at '%s'\n", entry->name); dm_dbg(" - found match at '%s'\n", entry->name);
ret = device_bind(parent, entry, name, NULL, offset, &dev); ret = device_bind(parent, entry, name, NULL, offset, &dev);
if (ret == -ENODEV) {
dm_dbg("Driver '%s' refuses to bind\n", entry->name);
continue;
}
if (ret) { if (ret) {
dm_warn("Error binding driver '%s': %d\n", entry->name, dm_warn("Error binding driver '%s': %d\n", entry->name,
ret); ret);