J721EXSOMXEVM: device tree for DS90UB934-Q1

Hi Satish,

As long as the pins on your custom board have the MCSPI0 related pins on the above mentioned AB26, AB25...etc.
That should be good.

Here is an FAQ that might be of help for you: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/947437/faq-ccs-tda4vm-how-to-use-spi-spi_dev-on-tda4-j721e

Best Regards,
Keerthy

Hi Keerthy,

This is the change I made in my Device tree to enable mcasp0. However I don't see any mcasp0 interface on my board.

mcasp0-i_q-tuner_deserializer_pins_default: mcasp0-i_q-tuner_deserializer_pins_default {
pinctrl-single,pins = <
J721E_IOPAD(0xd4, PIN_INPUT, 12) /* (AB26) PRG0_PRU0_GPO9.MCASP0_ACLKX */
J721E_IOPAD(0xd8, PIN_INPUT, 12) /* (AB25) PRG0_PRU0_GPO10.MCASP0_AFSX */
J721E_IOPAD(0xf8, PIN_INPUT, 12) /* (AB29) PRG0_PRU0_GPO18.MCASP0_AXR14 */
J721E_IOPAD(0xfc, PIN_INPUT, 12) /* (AB28) PRG0_PRU0_GPO19.MCASP0_AXR15 */
J721E_IOPAD(0xc0, PIN_INPUT, 12) /* (AD25) PRG0_PRU0_GPO4.MCASP0_AXR2 */
J721E_IOPAD(0xc8, PIN_INPUT, 12) /* (AE26) PRG0_PRU0_GPO6.MCASP0_AXR4 */
J721E_IOPAD(0xcc, PIN_INPUT, 12) /* (AC28) PRG0_PRU0_GPO7.MCASP0_AXR5 */
J721E_IOPAD(0xd0, PIN_INPUT, 12) /* (AC27) PRG0_PRU0_GPO8.MCASP0_AXR6 */
>;
};

&mcasp0 {
    pinctrl-names = "default";
    pinctrl-0 = <&mcasp0-i_q-tuner_deserializer_pins_default>;
    status="okay";
}


Few question - 
Where in file system can I check if mcasp0 interface is enabled? 
Is there any documentation available on MCASP in ti SDK?
Does aforementioned pinmuxing looks correct to you?

Thanks,
Satish

Satish,

I misread it as MCSPI0 and hence pointed to SPI FAQ. My bad. I have requested audio expert to look at this.

Best Regards,
Keerthy

Hello,

It would be helpful to get some feedback on this.

Thanks,

Satish

Satish, 

Not sure if you referenced infotainment daughter card overlay dtso at:

    arch/arm64/boot/dts/ti/k3-j721e-common-proc-board-infotainment.dtso

where the full McASP0 pins are enabled. I see a few pins are missing from your DT, but will need to match to your hardware schematics. 

once build, the uboot environment can be updated to use the corresponding .dtbo. 

To verify the McASP0 is enabled, you may check hardware registers for the LPSC_PER_AUDIO to confirm the corresponding LPSC module is enabled.

Regards

Jian

Hi Jian,

Could you please help me with following - 

1) Where and how should I enable MCASP0 (or  k3-j721e-common-proc-board-infotainment.dtso) in uboot environment?

2) In k3-j721e-common-proc-board-infotainment.dtso overlay It is pointing to "pcm3168a", whereas I am using DS90UB934-Q1 deserializer. I am assuming we need a node similar to " pcm3168a_a: audio-codec@47" encapsulated in I2C. Would you know what should be the node for DS90UB934?

Thanks,

Satish 

Adding one more question here.

3) Could you please let me know if Device Driver for DS90UB934 is available in Linux kernel? I checked "sound/soc/codecs" area of Linux kernel but didn't find the driver. Could you please let me know if there is a driver available in SDK which we can use for testing?

Thank you,

Satish

Jian,

Thank you for the response. We are good on #1.

on #2 - I do not see any reference to the DS90UB926QSQE dts file. I also did not find any text reference of DS90UB926QSQE in J7 EVM SDK.  k3-j721e-common-proc-board-infotainment.dtbo shows mcasp0 connected with two codecs. We are in SDK 7.1, could you let me know where did you find dts file for DS90UB926QSQE in SDK?

Thanks,

Satish