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Subject[PATCH v3 15/23] doc: media/v4l-drivers: Qualcomm Camera Subsystem - PIX Interface
Date
Update Qualcomm Camera Subsystem driver document for the PIX interface
and format conversion support.

Signed-off-by: Todor Tomov <todor.tomov@linaro.org>
---
Documentation/media/v4l-drivers/qcom_camss.rst | 41 +++++++++++++++++++-------
1 file changed, 31 insertions(+), 10 deletions(-)

diff --git a/Documentation/media/v4l-drivers/qcom_camss.rst b/Documentation/media/v4l-drivers/qcom_camss.rst
index 4707ea7..4df5655 100644
--- a/Documentation/media/v4l-drivers/qcom_camss.rst
+++ b/Documentation/media/v4l-drivers/qcom_camss.rst
@@ -45,12 +45,31 @@ Supported functionality

The current version of the driver supports:

-- input from camera sensor via CSIPHY;
-- generation of test input data by the TG in CSID;
-- raw dump of the input data to memory. RDI interface of VFE is supported.
- PIX interface (ISP processing, statistics engines, resize/crop, format
- conversion) is not supported in the current version;
-- concurrent and independent usage of two data inputs - could be camera sensors
+- Input from camera sensor via CSIPHY;
+- Generation of test input data by the TG in CSID;
+- RDI interface of VFE - raw dump of the input data to memory.
+
+ Supported formats:
+
+ - YUYV/UYVY/YVYU/VYUY (packed YUV 4:2:2);
+ - MIPI RAW8 (8bit Bayer RAW);
+ - MIPI RAW10 (10bit packed Bayer RAW);
+ - MIPI RAW12 (12bit packed Bayer RAW).
+
+- PIX interface of VFE
+
+ - Format conversion of the input data.
+
+ Supported input formats:
+
+ - YUYV/UYVY/YVYU/VYUY (packed YUV 4:2:2).
+
+ Supported output formats:
+
+ - NV12/NV21 (two plane YUV 4:2:0);
+ - NV16/NV61 (two plane YUV 4:2:2).
+
+- Concurrent and independent usage of two data inputs - could be camera sensors
and/or TG.


@@ -65,15 +84,15 @@ interface, the driver is split into V4L2 sub-devices as follows:
- 2 CSID sub-devices - each CSID is represented by a single sub-device;
- 2 ISPIF sub-devices - ISPIF is represented by a number of sub-devices equal
to the number of CSID sub-devices;
-- 3 VFE sub-devices - VFE is represented by a number of sub-devices equal to
- the number of RDI input interfaces.
+- 4 VFE sub-devices - VFE is represented by a number of sub-devices equal to
+ the number of the input interfaces (3 RDI and 1 PIX).

The considerations to split the driver in this particular way are as follows:

- representing CSIPHY and CSID modules by a separate sub-device for each module
allows to model the hardware links between these modules;
-- representing VFE by a separate sub-devices for each RDI input interface allows
- to use the three RDI interfaces concurently and independently as this is
+- representing VFE by a separate sub-devices for each input interface allows
+ to use the input interfaces concurently and independently as this is
supported by the hardware;
- representing ISPIF by a number of sub-devices equal to the number of CSID
sub-devices allows to create linear media controller pipelines when using two
@@ -99,6 +118,8 @@ nodes) is as follows:
- msm_vfe0_video1
- msm_vfe0_rdi2
- msm_vfe0_video2
+- msm_vfe0_pix
+- msm_vfe0_video3


Implementation
--
2.7.4
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