TDA4VM: some problem for UB962(connected in i2c6)

Hi,

Refer:

https://e2e.ti.com/support/processors/f/791/p/879861/3259608#3259608

If you are using AA3 & Y2 then below should be device tree entry for main_i2c6_pins_default

&main_pmx0 {
main_i2c6_pins_default: main-i2c6-pins-default {
pinctrl-single,pins = <
J721E_IOPAD(0x1d0, PIN_INPUT_PULLUP, 2) /* (AA3) SPI0_D1.I2C6_SCL */
J721E_IOPAD(0x1e4, PIN_INPUT_PULLUP, 2) /* (Y2) SPI1_D1.I2C6_SDA */
>;
};

By default if you pick any ball in the pinmux tool you get:

myi2c3_pins_default: myi2c3_pins_default {
pinctrl-single,pins = <
J721E_IOPAD(0x218, PIN_INPUT_PULLUP, 4) /* (W2) I3C0_SCL.I2C6_SCL */
J721E_IOPAD(0x21c, PIN_INPUT_PULLUP, 4) /* (W1) I3C0_SDA.I2C6_SDA */
>;
};

So please verify the correct ball that you are using on your board and change the device tree
accordingly.

Regards,
Keerthy

Hello

I have verified the correct ball.that is wright.

but I test i2c6 in Linux:

i2cdetect -r -y 9

omap_i2c 2060000.i2c: timeout waiting for bus ready 

hello

1 .i can not probe I2C lines coming out of SoC and going to the Deserializer ?

i enable gpio output pullup in dts:

main_gpio0_pins_default: main_gpio0_pins_default {
  pinctrl-single,pins = <
            J721E_IOPAD(0xec, PIN_OUTPUT_PULLUP, 7)
    
  >;
 };

&main_gpio0 {
 status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&main_gpio0_pins_default>;
};

normally,the gpio is 3.3v,but it only 2.7V,i do not know why?

Hi,

Will it be possible to show the snippet of connection from Schematics between Deserializer and TDA4VM SoC ?

Hello,

One suggestion is to check VDDSHV2 voltage going to Balls AA17, AB16, AB18, AC17. The output of GPIO0 would be related to the input to VDDSHV2

hi

though the gpio ouput is only 2.7V，but out Deserializer（UB962） input voltages are fine and refclk given correctly（test by oscilloscope）

and CAM_PDB pin have 1.8V

but in Linux kenel，i test i2c6，

i2cdetect -r -y 9    （9 =》i2c6，it is no problem）

omap_i2c 2060000.i2c: timeout waiting for bus ready

in Linux dts file:

1.i enable i2c6 and i2c6 clk/data pin

2.i enable some gpio port(enable pin to Deserializer)

my question:

I do not do anything about slave(DB962) but supply DB962?

Hi

I did not get you question. Can you let me know again ?

1. Do you have pull ups on the I2C lines externally ?

2. Will it be possible to probe I2C lines going to Deserializer(like the way you probed CAM_PDB etc) using oscilloscope and see if they are toggling, getting right clock, slave ID and data ?

3. What is the input voltage VDDIO to Deserializer ? Is it 1.8V or 3.3V ? What are the input voltages of VDDSHV0 and VDDSHV3 ?

Hello

1.ub962 can be read in Linux by i2cdetect -r -y 9(the pin config error perviously)

now question:

our board use camera(ub953) to connect ub962,but now un953 can not be read in i2c bus

how to config un962,do you have demo to do it?

Hello

I use sdk 06_02_00

there are DB962 resource in rtos sdk?

I read vision_app Multi Camera,but I can not get any useful information.

Hi,

UB962 is not supported in standard SDK.. You would have to add it to vision apps in order to use single camera/multi camera examples..

Could you provide some more information? What exactly are you looking for? 

Regards,

Brijesh