of: property: Add fw_devlink support for optional properties

Not all DT bindings are mandatory bindings. Add support for optional DT
bindings and mark iommus, iommu-map, dmas as optional DT bindings.

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20210205222644.2357303-5-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/of/property.c b/drivers/of/property.c
index 94f3f6c..79b6851 100644 (file)
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -1235,6 +1235,7 @@ static struct device_node *parse_##fname(struct device_node *np,       \
 struct supplier_bindings {
        struct device_node *(*parse_prop)(struct device_node *np,
                                          const char *prop_name, int index);
+       bool optional;
 };
 
 DEFINE_SIMPLE_PROP(clocks, "clocks", "#clock-cells")
@@ -1309,12 +1310,12 @@ static struct device_node *parse_interrupts(struct device_node *np,
 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_iommus, .optional = true, },
+       { .parse_prop = parse_iommu_maps, .optional = true, },
        { .parse_prop = parse_mboxes, },
        { .parse_prop = parse_io_channels, },
        { .parse_prop = parse_interrupt_parent, },
-       { .parse_prop = parse_dmas, },
+       { .parse_prop = parse_dmas, .optional = true, },
        { .parse_prop = parse_power_domains, },
        { .parse_prop = parse_hwlocks, },
        { .parse_prop = parse_extcon, },
@@ -1368,6 +1369,11 @@ static int of_link_property(struct device_node *con_np, const char *prop_name)
 
        /* Do not stop at first failed link, link all available suppliers. */
        while (!matched && s->parse_prop) {
+               if (s->optional && !fw_devlink_is_strict()) {
+                       s++;
+                       continue;
+               }
+
                while ((phandle = s->parse_prop(con_np, prop_name, i))) {
                        matched = true;
                        i++;