iMX8M Plus mxc-isi-m2m video0

[khang_letruong]

Hi Experts,

Usually I see that mxc-isi-m2m device is mounted under /dev/video0 but I don't know what purpose it is for. I then disable it in my system so that the physical cameras appear from index 0. Could anyone clarify the use of that device and what could be the consequence in case it is disabled, please?

Thanks in advance,
Khang

[joanxie]

refer to the dts file:

&isi_0 {
	status = "okay";

	cap_device {
		status = "okay";
	};

	m2m_device {
		status = "okay";
	};
};

&isi_1 {
	status = "disabled";

	cap_device {
		status = "okay";
	};

you can find imx8mp can support isi-m2m or isi-cap, if you disable the isi-m2m, can connect the camera to the isi-cap

[khang_letruong]

Thanks @joanxie for the pointing out. But I would like to know the difference btw the two devices : m2m vs cap. Which one is better in term of perf. if any ?

Best regard,

Khang

[joanxie]

for the difference, you can refer to their driver:

"https://source.codeaurora.org/external/imx/linux-imx/tree/drivers/staging/media/imx/imx8-isi-m2m.c?h...

"https://source.codeaurora.org/external/imx/linux-imx/tree/drivers/staging/media/imx/imx8-isi-cap.c?h...

you can enable one of them and tested on your case to check