Hi Sakari,
Thank you for the patch.
On Monday 16 March 2015 02:26:08 Sakari Ailus wrote:
> Add lane_polarity field to struct v4l2_of_bus_mipi_csi2 and write the
> contents of the lane polarity property to it. The field tells the polarity
> of the physical lanes starting from the first one. Any unused lanes are
> ignored, i.e. only the polarity of the used lanes is specified.
>
> Also rework reading the "data-lanes" property a little.
>
> Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxx>
> ---
> drivers/media/v4l2-core/v4l2-of.c | 41 ++++++++++++++++++++++++++--------
> include/media/v4l2-of.h | 3 +++
> 2 files changed, 35 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-of.c
> b/drivers/media/v4l2-core/v4l2-of.c index b4ed9a9..e44cc15 100644
> --- a/drivers/media/v4l2-core/v4l2-of.c
> +++ b/drivers/media/v4l2-core/v4l2-of.c
> @@ -19,11 +19,10 @@
>
> #include <media/v4l2-of.h>
>
> -static void v4l2_of_parse_csi_bus(const struct device_node *node,
> - struct v4l2_of_endpoint *endpoint)
> +static int v4l2_of_parse_csi_bus(const struct device_node *node,
> + struct v4l2_of_endpoint *endpoint)
> {
> struct v4l2_of_bus_mipi_csi2 *bus = &endpoint->bus.mipi_csi2;
> - u32 data_lanes[ARRAY_SIZE(bus->data_lanes)];
> struct property *prop;
> bool have_clk_lane = false;
> unsigned int flags = 0;
> @@ -32,16 +31,34 @@ static void v4l2_of_parse_csi_bus(const struct
> device_node *node, prop = of_find_property(node, "data-lanes", NULL);
> if (prop) {
> const __be32 *lane = NULL;
> - int i;
> + unsigned int i;
>
> - for (i = 0; i < ARRAY_SIZE(data_lanes); i++) {
> - lane = of_prop_next_u32(prop, lane, &data_lanes[i]);
> + for (i = 0; i < ARRAY_SIZE(bus->data_lanes); i++) {
> + lane = of_prop_next_u32(prop, lane, &v);
> if (!lane)
> break;
> + bus->data_lanes[i] = v;
> }
> bus->num_data_lanes = i;
> - while (i--)
> - bus->data_lanes[i] = data_lanes[i];
> + }
> +
> + prop = of_find_property(node, "lane-polarity", NULL);
> + if (prop) {
> + const __be32 *polarity = NULL;
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(bus->lane_polarity); i++) {
> + polarity = of_prop_next_u32(prop, polarity, &v);
> + if (!polarity)
> + break;
> + bus->lane_polarity[i] = v;
> + }
> +
> + if (i < 1 + bus->num_data_lanes /* clock + data */) {
> + pr_warn("bad size of lane-polarity array in node %s, was %u,
should be
> %u\n",
How about
pr_warn("%s: too few lane-polarity entries (need %u, got %u)\n",
node->full_name, 1 + bus->num_data_lanes, i);
> + node->full_name, i, 1 + bus->num_data_lanes);
> + return -EINVAL;
> + }
> }
>
> if (!of_property_read_u32(node, "clock-lanes", &v)) {
> @@ -56,6 +73,8 @@ static void v4l2_of_parse_csi_bus(const struct device_node
> *node,
>
> bus->flags = flags;
> endpoint->bus_type = V4L2_MBUS_CSI2;
> +
> + return 0;
> }
>
> static void v4l2_of_parse_parallel_bus(const struct device_node *node,
> @@ -127,11 +146,15 @@ static void v4l2_of_parse_parallel_bus(const struct
> device_node *node, int v4l2_of_parse_endpoint(const struct device_node
> *node,
> struct v4l2_of_endpoint *endpoint)
> {
> + int rval;
> +
> of_graph_parse_endpoint(node, &endpoint->base);
> endpoint->bus_type = 0;
> memset(&endpoint->bus, 0, sizeof(endpoint->bus));
>
> - v4l2_of_parse_csi_bus(node, endpoint);
> + rval = v4l2_of_parse_csi_bus(node, endpoint);
> + if (rval)
> + return rval;
> /*
> * Parse the parallel video bus properties only if none
> * of the MIPI CSI-2 specific properties were found.
> diff --git a/include/media/v4l2-of.h b/include/media/v4l2-of.h
> index 70fa7b7..a70eb52 100644
> --- a/include/media/v4l2-of.h
> +++ b/include/media/v4l2-of.h
> @@ -29,12 +29,15 @@ struct device_node;
> * @data_lanes: an array of physical data lane indexes
> * @clock_lane: physical lane index of the clock lane
> * @num_data_lanes: number of data lanes
> + * @lane_polarity: polarity of the lanes. The order is the same of
> + * the physical lanes.
> */
> struct v4l2_of_bus_mipi_csi2 {
> unsigned int flags;
> unsigned char data_lanes[4];
> unsigned char clock_lane;
> unsigned short num_data_lanes;
> + bool lane_polarity[5];
A bit of bike-shedding here, should this be lane_polarities ? And, thinking
about it, should the DT property be renamed to "lane-polarities" as well ?
This would match "data-lanes".
> };
>
> /**
--
Regards,
Laurent Pinchart
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