Hi Niklas,
On Thu, Jan 26, 2017 at 02:12:59PM +0100, Niklas Söderlund wrote:
> All lines in data-lanes and clock-lanes properties must be unique.
> Instead of drivers checking for this add it to the generic parser.
>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
> ---
> drivers/media/v4l2-core/v4l2-of.c | 18 +++++++++++++++++-
> 1 file changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-of.c b/drivers/media/v4l2-core/v4l2-of.c
> index 93b33681776c..1042db6bb996 100644
> --- a/drivers/media/v4l2-core/v4l2-of.c
> +++ b/drivers/media/v4l2-core/v4l2-of.c
> @@ -32,12 +32,19 @@ static int v4l2_of_parse_csi_bus(const struct device_node *node,
> prop = of_find_property(node, "data-lanes", NULL);
> if (prop) {
> const __be32 *lane = NULL;
> - unsigned int i;
> + unsigned int i, n;
>
> for (i = 0; i < ARRAY_SIZE(bus->data_lanes); i++) {
> lane = of_prop_next_u32(prop, lane, &v);
> if (!lane)
> break;
> + for (n = 0; n < i; n++) {
> + if (bus->data_lanes[n] == v) {
> + pr_warn("%s: duplicated lane %u in data-lanes\n",
> + node->full_name, v);
> + return -EINVAL;
> + }
> + }
In some cases it's just the number of lanes that matter, not their order, as
the hardware cannot reorder them. I might still just print a warning but not
return an error. Same below.
Although then hardware that actually can reorder the lanes might have issues
if such a bug exists in DTB. Presumably the DTB would have been tested at
some point though.
> bus->data_lanes[i] = v;
> }
> bus->num_data_lanes = i;
> @@ -63,6 +70,15 @@ static int v4l2_of_parse_csi_bus(const struct device_node *node,
> }
>
> if (!of_property_read_u32(node, "clock-lanes", &v)) {
> + unsigned int n;
> +
> + for (n = 0; n < bus->num_data_lanes; n++) {
> + if (bus->data_lanes[n] == v) {
> + pr_warn("%s: duplicated lane %u in clock-lanes\n",
> + node->full_name, v);
> + return -EINVAL;
> + }
> + }
> bus->clock_lane = v;
> have_clk_lane = true;
> }
--
Kind regards,
Sakari Ailus
e-mail: sakari.ailus@xxxxxx XMPP: sailus@xxxxxxxxxxxxxx
