Add user documentation for the DW100 driver. Signed-off-by: Xavier Roumegue <xavier.roumegue@xxxxxxxxxxx> --- .../userspace-api/media/drivers/dw100.rst | 23 +++++++++++++++++++ .../userspace-api/media/drivers/index.rst | 1 + 2 files changed, 24 insertions(+) create mode 100644 Documentation/userspace-api/media/drivers/dw100.rst diff --git a/Documentation/userspace-api/media/drivers/dw100.rst b/Documentation/userspace-api/media/drivers/dw100.rst new file mode 100644 index 000000000000..4cd55c75628e --- /dev/null +++ b/Documentation/userspace-api/media/drivers/dw100.rst @@ -0,0 +1,23 @@ +.. SPDX-License-Identifier: GPL-2.0 + +DW100 dewarp driver +=========================== + +The Vivante DW100 Dewarp Processor IP core found on i.MX8MP SoC applies a +programmable geometrical transformation on input image to correct distorsion +introduced by lenses. + +The transformation function is exposed by the hardware as a grid map with 16x16 +pixel macroblocks indexed using X, Y vertex coordinates. Each x, y coordinate +register uses 16 bits to record the coordinate address in UQ12.4 fixed point +format. + +The dewarping map can be set from application through a dedicated v4l2 control. +If not set or invalid, the driver computes an identity map prior to start the +processing engine. The map is evaluated as invalid if the array size does not +match the expected size inherited from the destination image resolution. + +More details on the DW100 hardware operations can be found in +*chapter 13.15 DeWarp* of IMX8MP_ reference manuel. + +.. _IMX8MP: https://www.nxp.com/webapp/Download?colCode=IMX8MPRM diff --git a/Documentation/userspace-api/media/drivers/index.rst b/Documentation/userspace-api/media/drivers/index.rst index 12e3c512d718..8826777321b0 100644 --- a/Documentation/userspace-api/media/drivers/index.rst +++ b/Documentation/userspace-api/media/drivers/index.rst @@ -33,6 +33,7 @@ For more details see the file COPYING in the source distribution of Linux. ccs cx2341x-uapi + dw100 hantro imx-uapi max2175 -- 2.35.1
