IMX6 TVP5151 problem

john_smith — Wed, 17 Aug 2016 08:43:16 GMT

Hello!

I'm trying to connect camera and get any data from it. The connection scheme looks like this: Camera=>TVP5151=>CSI0 parallel interface=>IPU0

I added TVP5151 support in the device tree (TVP5151 and TVP5150 are very similar):

&i2c1 {

clock-frequency = <100000>;

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_i2c1_2>;

status = "okay";

videoin: tvp5151@5D {

compatible = "ti,tvp5150";

reg = <0x5D>;

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_ipu1_2>;

clocks = <&clks 201>;

clock-names = "csi_mclk";

mclk = <24000000>;

mclk_source = <0>;

ipu_id = <0>;

csi_id = <0>;

cvbs = <1>;

};

I also added:

v4l2_cap_0 {

compatible = "fsl,imx6q-v4l2-capture";

ipu_id = <0>;

csi_id = <0>;

mclk_source = <0>;

status = "okay";

};

I2C connection works fine - I can read TVP5151 registers and its values are correct. The problem is that when I try to open video device:

cat /dev/video0

I get this error:

ERROR: v4l2 capture: slave not found!

I found that this error is caused by function mxc_v4l_open() (mxc_v4l2_capture.c). After calling:

cam_data *cam = video_get_drvdata(dev);

the pointer cam->sensor is NULL, so we get the error:

if (cam->sensor == NULL)

{

pr_err("ERROR: v4l2 capture: slave not found!\n");

return -EAGAIN;

}

What is a reason of such a behaviour?

Thank you in advance!

Re: IMX6 TVP5151 problem

joanxie — Thu, 18 Aug 2016 10:29:09 GMT

try to use insmode to download the tvp5151.

Re: IMX6 TVP5151 problem

john_smith — Fri, 19 Aug 2016 07:46:26 GMT

Hi! Thank you for your answer!

But tvp5150 probe() function is called automatically when the kernel starts... Does it mean that there is no need in insmod?

Re: IMX6 TVP5151 problem

mcergun — Sat, 01 Oct 2016 16:13:09 GMT

have you solved this problem?

i am facing a similar one. kernel automatically probes my module and i am sure that _probe function is called and

v4l2_int_device_register function doesn't return an error. still i am getting NULL pointer on the same struct

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