diff options
| author | Michael Riesch <michael.riesch@wolfvision.net> | 2022-01-14 13:57:55 +0300 |
|---|---|---|
| committer | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2022-12-07 19:58:46 +0300 |
| commit | 1069470070808cafa65d400c10e5c4791d0dc0df (patch) | |
| tree | b4a2265306b0910f1e7217e20267b35f6e901000 /drivers/media | |
| parent | 55f6f743e9da6cfa68d5c59f4ef40e6e7603d08a (diff) | |
| download | linux-1069470070808cafa65d400c10e5c4791d0dc0df.tar.xz | |
media: v4l2-mediabus: add support for dual edge sampling
Some devices support sampling of the parallel data at both edges of the
interface pixel clock in order to reduce the pixel clock by two.
Add a mediabus flag that represents this feature.
Signed-off-by: Michael Riesch <michael.riesch@wolfvision.net>
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-fwnode.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c index 3d85a8600f57..3d9533c1b202 100644 --- a/drivers/media/v4l2-core/v4l2-fwnode.c +++ b/drivers/media/v4l2-core/v4l2-fwnode.c @@ -298,10 +298,25 @@ v4l2_fwnode_endpoint_parse_parallel_bus(struct fwnode_handle *fwnode, if (!fwnode_property_read_u32(fwnode, "pclk-sample", &v)) { flags &= ~(V4L2_MBUS_PCLK_SAMPLE_RISING | - V4L2_MBUS_PCLK_SAMPLE_FALLING); - flags |= v ? V4L2_MBUS_PCLK_SAMPLE_RISING : - V4L2_MBUS_PCLK_SAMPLE_FALLING; - pr_debug("pclk-sample %s\n", v ? "high" : "low"); + V4L2_MBUS_PCLK_SAMPLE_FALLING | + V4L2_MBUS_PCLK_SAMPLE_DUALEDGE); + switch (v) { + case 0: + flags |= V4L2_MBUS_PCLK_SAMPLE_FALLING; + pr_debug("pclk-sample low\n"); + break; + case 1: + flags |= V4L2_MBUS_PCLK_SAMPLE_RISING; + pr_debug("pclk-sample high\n"); + break; + case 2: + flags |= V4L2_MBUS_PCLK_SAMPLE_DUALEDGE; + pr_debug("pclk-sample dual edge\n"); + break; + default: + pr_warn("invalid argument for pclk-sample"); + break; + } } if (!fwnode_property_read_u32(fwnode, "data-active", &v)) { |