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FROMGIT: of: property: Add device link support for "iommu-map"

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Commit 8e12257dead7 ("of: property: Add device link support for iommus,
mboxes and io-channels") added device link support for IOMMU linkages
described using the "iommus" property. For PCI devices, this property
is not present and instead the "iommu-map" property is used on the host
bridge node to map the endpoint RequesterIDs to their corresponding
IOMMU instance.

Add support for "iommu-map" to the device link supplier bindings so that
probing of PCI devices can be deferred until after the IOMMU is
available.

Cc: Rob Herring <robh@kernel.org>
Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Acked-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20191120190028.4722-1-will@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry-picked from commit e149573b2f84d0517648dafc0db625afa681ed54
 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git driver-core-next)
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: Ife0cf1ed0256af47ed0cae7156f3184de355c42c
This commit is contained in:
Will Deacon 2019-11-20 19:00:28 +00:00 • committed by Todd Kjos
commit b0367de0dd
1 changed files with 10 additions and 0 deletions
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10
drivers/of/property.c
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@ -1190,10 +1190,20 @@ DEFINE_SIMPLE_PROP(mboxes, "mboxes", "#mbox-cells")
DEFINE_SIMPLE_PROP(io_channels, "io-channel", "#io-channel-cells")
DEFINE_SUFFIX_PROP(regulators, "-supply", NULL)
static struct device_node *parse_iommu_maps(struct device_node *np,
const char *prop_name, int index)
{
if (strcmp(prop_name, "iommu-map"))
return NULL;
return of_parse_phandle(np, prop_name, (index * 4) + 1);
}
static const struct supplier_bindings of_supplier_bindings[] = {
{ .parse_prop = parse_clocks, },
{ .parse_prop = parse_interconnects, },
{ .parse_prop = parse_iommus, },
{ .parse_prop = parse_iommu_maps, },
{ .parse_prop = parse_mboxes, },
{ .parse_prop = parse_io_channels, },
{ .parse_prop = parse_regulators, },