Hi Laurent,
On Mon, Mar 16, 2015 at 11:05:38AM +0200, Laurent Pinchart wrote:
> 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.ai...@iki.fi>
> > ---
> > 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);
Fixed.
> > + 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".
Good idea. I'll take that into account before reposting the sets.
--
Cheers,
Sakari Ailus
e-mail: sakari.ai...@iki.fi XMPP: sai...@retiisi.org.uk
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