feat(linux): CSI2RX: Add documentation on V3Link fusion

Add documentation on V3Link fusion on AM68, AM69 and J722S and also add
documentation on how to configure two CSI TX on V3Link fusion to two
CSI RX on AM69 SK.

Signed-off-by: Yemike Abhilash Chandra <[email protected]>

Author: Yemike-Abhilash-Chandra

source/linux/Foundational_Components/Kernel/Kernel_Drivers/Camera/CSI2RX.rst

@@ -852,6 +852,10 @@ Enabling camera sensors
       => setenv name_overlays ti/k3-j721e-sk-fpdlink-fusion.dtbo ti/k3-fpdlink-imx390-rcm-0-0.dtbo
       => boot
 
+      # For single IMX219 connected to RX port 0 on V3Link fusion on AM68A SK:
+      => setenv name_overlays ti/k3-am68-sk-v3link-fusion.dtbo ti/k3-v3link-imx219-0-0.dtbo
+      => boot
+
    To enable IMX219 camera connected to the 22-pin FFC connectoron AM68A SK,
    enable the sensor overlay at U-boot prompt:
 
@@ -885,6 +889,8 @@ Enabling camera sensors
       +--------------+---------------------------------------+-----------------------------------+
       | AM68A        | FPDLink fusion 1 EVM, IMX390          | SRGGB12_1X12/1936x1100 at 30 fps  |
       +--------------+---------------------------------------+-----------------------------------+
+      | AM68A        | V3Link fusion, IMX219                 | SRGGB8_1X8/1920x1080 at 30 fps    |
+      +--------------+---------------------------------------+-----------------------------------+
 
 .. ifconfig:: CONFIG_part_variant in ('J784S4','J742S2')
 
@@ -920,6 +926,22 @@ Enabling camera sensors
       => setenv name_overlays ti/k3-j721e-sk-fpdlink-fusion.dtbo ti/k3-fpdlink-imx390-rcm-0-0.dtbo
       => boot
 
+      # For single IMX219 connected to RX port 0 on V3Link fusion on AM69A SK:
+      => setenv name_overlays ti/k3-am68-sk-v3link-fusion.dtbo ti/k3-v3link-imx219-0-0.dtbo
+      => boot
+
+      # For using two CSI TX on V3Link fusion to two CSI RX on AM69A SK
+      => setenv name_overlays ti/k3-am68-sk-v3link-fusion-dual-csitx.dtbo ti/k3-v3link-imx219-0-2.dtbo ti/k3-v3link-imx219-0-3.dtbo ti/k3-v3link-imx219-1-0.dtbo ti/k3-v3link-imx219-1-1.dtbo
+      => boot
+      # After booting, configure routing on the V3Link fusion for the above setup using the following commands:
+      => media-ctl -R '"ds90ub960 5-0030" [2/0 -> 4/2 [1], 3/0 -> 4/3 [1]]'
+      => media-ctl -R '"ds90ub960 6-0030" [0/0 -> 5/0 [1], 1/0 -> 5/1 [1]]'
+      => media-ctl --set-v4l2 '"ds90ub960 5-0030" 2/0 [fmt:SRGGB8_1X8/1920x1080 field:none]'
+      => media-ctl --set-v4l2 '"ds90ub960 5-0030" 3/0 [fmt:SRGGB8_1X8/1920x1080 field:none]'
+      => media-ctl --set-v4l2 '"ds90ub960 6-0030" 0/0 [fmt:SRGGB8_1X8/1920x1080 field:none]'
+      => media-ctl --set-v4l2 '"ds90ub960 6-0030" 1/0 [fmt:SRGGB8_1X8/1920x1080 field:none]'
+      # The two CSI TX configuration on V3Link fusion described above can be used on relevant platforms using similar commands.
+
    To enable IMX219 camera connected to the 22-pin FFC connector on AM69A SK,
    enable the sensor overlay at U-boot prompt:
 
@@ -954,6 +976,8 @@ Enabling camera sensors
       +--------------+---------------------------------------+-----------------------------------+
       | AM69A        | FPDLink fusion 1 EVM, IMX390          | SRGGB12_1X12/1936x1100 at 30 fps  |
       +--------------+---------------------------------------+-----------------------------------+
+      | AM69A        | V3Link fusion, IMX219                 | SRGGB8_1X8/1920x1080 at 30 fps    |
+      +--------------+---------------------------------------+-----------------------------------+
       | J742S2       | FPDLink fusion 1 EVM, IMX390          | SRGGB12_1X12/1936x1100 at 30 fps  |
       +--------------+---------------------------------------+-----------------------------------+
 
@@ -980,6 +1004,10 @@ Enabling camera sensors
       => setenv name_overlays ti/k3-j721s2-evm-fusion.dtbo ti/k3-fpdlink-imx390-rcm-0-0.dtbo
       => boot
 
+      # For single IMX219 connected to RX port 0 on V3Link fusion on J722S EVM:
+      => setenv name_overlays ti/k3-j722s-evm-v3link-fusion.dtbo ti/k3-v3link-imx219-0-0.dtbo
+      => boot
+
    For more details on building or applying overlays permanently, refer to the
    :ref:`How to enable DT overlays in linux <howto_dt_overlays>` guide.
 
@@ -998,3 +1026,5 @@ Enabling camera sensors
       +--------------+---------------------------------------+-----------------------------------+
       | J722S        | IMX219 RPi Camera                     | SRGGB8_1X8/1920x1080 at 30 fps    |
       +--------------+---------------------------------------+-----------------------------------+
+      | J722S        | V3Link fusion, IMX219                 | SRGGB8_1X8/1920x1080 at 30 fps    |
+      +--------------+---------------------------------------+-----------------------------------+