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E-2 Applying OV5640 Driver Patch File to RZ/V2H

This guide provides detailed steps for applying a patch to support the OV5640 camera module on the Renesas RZ/V2H platform.

Step 1: Modify the Device Tree and Kernel Configuration​

Edit the Device Tree Source​

tip

Edit the link from github.com to github.dev to enter web editor mode.

Use the shortcut Ctrl + H to quickly replace text.

Access and modify the appropriate Device Tree Source file:

Link to r9a09g057h4-evk-ver1.dts file

replace

Make the following changes:

  • Replace any instance of ov5645 with ov5640 to switch the camera sensor.
  • Update enable_gpios from GPIO_ACTIVE_HIGH to GPIO_ACTIVE_LOW.

Update the Kernel Configuration​

Edit the defconfig file to enable the OV5640 driver:

Link to defconfig file

Add the following line:

CONFIG_VIDEO_OV5640=y

Step 2: Create and Export the Patch​

Stage the modified files.

stage

Export the changes. A diff file will be generated.

export

As there are two files that have been edited, there will be two diff files. Merge them together into one single file by using any text editor of your preference. Save and name the file as 0001-add_ov5640.patch.

Step 3: Integrate Patch File Into Build​

Move the patch file to this directory:

~/rzv2h/src_setup/yocto/meta-rz-features/meta-rz-graphics/recipes-kernel/linux/files

Edit .bbappend file:

FILESEXTRAPATHS_prepend := "${THISDIR}/files:"

SRC_URI_append_rzg2l = " \
        file://0002-Workaround-GPU-driver-remove-power-domains-of-GPU-no.patch \
"
SRC_URI_append_rzv2l = " \
        file://0002-Workaround-GPU-driver-remove-power-domains-v2l.patch \
"

SRC_URI_append_rzv2h = " \
        file://0001-add_ov5640.patch \
"

Enter into the directory ~/rzv2h/src_setup/yocto/build. Then, start the build by running:

TEMPLATECONF=${PWD}/meta-renesas/meta-rzv2h/docs/template/conf/ source poky/oe-init-build-env

MACHINE=rzv2h-evk-ver1 bitbake core-image-weston

Step 4: Deploy the Image and Verify Camera Registration​

Burn the image named core-image-weston-rzv2h-evk-ver1.wic.gz into an SD card. You may refer to Step 8 of 2-2.

Use the following command to inspect media device nodes:

media-ctl /dev/media0 -p

Confirm that the OV5640 camera is detected and registered correctly by the CRU (Camera Receiver Unit).

Step 5: Configure Camera Preview Script​

Open the preview.sh script.

Modify its contents based on the media-ctl output to correctly map the camera and video device nodes.

Run the script to start the camera preview and verify functionality.