Hi Alexander, On Tue, Nov 23, 2021 at 08:38:47AM +0100, Alexander Stein wrote: > Am Dienstag, dem 23.11.2021 um 02:15 +0200 schrieb Laurent Pinchart: > > On Sun, Nov 21, 2021 at 09:07:26PM -0600, Adam Ford wrote: > > > On Sun, Nov 21, 2021 at 5:18 PM Laurent Pinchart wrote: > > > > On Sat, Nov 06, 2021 at 10:54:26AM -0500, Adam Ford wrote: > > > > > The baseboard has support for a TDNext 5640 Camera which > > > > > uses an OV5640 connected to a 2-lane CSI2 interface. > > > > > > > > > > With the CSI and mipi_csi2 drivers pointing to an OV5640 camera, the media > > > > > pipeline can be configured with the following: > > > > > > > > > > media-ctl --links "'ov5640 1-003c':0->'imx7-mipi-csis.0':0[1]" > > > > > > > > > > The camera and various nodes in the pipeline can be configured for UYVY: > > > > > media-ctl -v -V "'ov5640 1-003c':0 [fmt:UYVY8_1X16/640x480 field:none]" > > > > > media-ctl -v -V "'csi':0 [fmt:UYVY8_1X16/640x480 field:none]" > > > > > > > > > > Signed-off-by: Adam Ford <aford173@xxxxxxxxx> > > > > > > > > As the ov5640 is on an add-on module, would a DT overlay be better ? > > > > > > At least for the Beacon / LogicPD boards, I would prefer to avoid the > > > overlays. We have an i.M6Q and an OMAP3 board with cameras enabled in > > > our development kit device trees. If the cameras are not connected, > > > they just display a message that the cameras are not communicating and > > > move on. I'm OK with that. > > > > You know the board better than I do, so I won't push against this, but I > > still think it may not lead to the best user experience, especially if a > > user wanted to connect a different sensor to the development board. > > I see the advantages of overlays compared to "stacked" .dts files. But > is there any general supported interface how to actually apply an overlay? > Documentation/devicetree/overlay-notes.rst > states of_overlay_fdt_apply() but there is only exactly one user in- > kernel (rcar-du). Is it expected that the bootloader like u-boot shall > apply the .dtbo files? I believe the boot loader is expected to apply overlays nowadays, yes. That's my personal workflow. -- Regards, Laurent Pinchart
