All lanes in data-lanes and clock-lanes properties should be unique. Add
a check for this in v4l2_of_parse_csi_bus() and print a warning if
duplicated lanes are found.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
---
Changes since v1:
- Do not return -EINVAL if a duplicate is found. Sakari pointed out
there are drivers where the number of lanes matter but not the actual
lane numbers. Updated commit message to highlight that only a warning
is printed.
- Switched to a bitmask to track lanes used instead of a nested loop,
thanks Laurent for the suggestion.
drivers/media/v4l2-core/v4l2-of.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/media/v4l2-core/v4l2-of.c b/drivers/media/v4l2-core/v4l2-of.c
index 93b33681776ca427..4f59f442dd0a64c9 100644
--- a/drivers/media/v4l2-core/v4l2-of.c
+++ b/drivers/media/v4l2-core/v4l2-of.c
@@ -26,7 +26,7 @@ static int v4l2_of_parse_csi_bus(const struct device_node *node,
struct v4l2_of_bus_mipi_csi2 *bus = &endpoint->bus.mipi_csi2;
struct property *prop;
bool have_clk_lane = false;
- unsigned int flags = 0;
+ unsigned int flags = 0, lanes_used = 0;
u32 v;
prop = of_find_property(node, "data-lanes", NULL);
@@ -38,6 +38,12 @@ static int v4l2_of_parse_csi_bus(const struct device_node *node,
lane = of_prop_next_u32(prop, lane, &v);
if (!lane)
break;
+
+ if (lanes_used & BIT(v))
+ pr_warn("%s: duplicated lane %u in data-lanes\n",
+ node->full_name, v);
+ lanes_used |= BIT(v);
+
bus->data_lanes[i] = v;
}
bus->num_data_lanes = i;
@@ -63,6 +69,11 @@ static int v4l2_of_parse_csi_bus(const struct device_node *node,
}
if (!of_property_read_u32(node, "clock-lanes", &v)) {
+ if (lanes_used & BIT(v))
+ pr_warn("%s: duplicated lane %u in clock-lanes\n",
+ node->full_name, v);
+ lanes_used |= BIT(v);
+
bus->clock_lane = v;
have_clk_lane = true;
}
--
2.11.0
--
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