Linux/TLV320AIC3254-Q1: TLV320AIC3254-Q1 linux driver and interfacing with raspberry pi board

Hi Shrikant,

Welcome to TI E2E community.
Can you please let us know which kernel version are you using for your Pi board? Also which Raspberry Pi version(Pi 1/2/3)?
Generally, if the TLV 320AIC code is part of your Kernel for Pi, the you just need to enable in the kernel configuration. Please confirm it.
Have a look at the below link also. May help you.

e2e.ti.com/.../266169

Thanks,
Prabhuraj
BlackPepper Technologies

3. Also one more question, in raspberry pi, the y mention enabling particular codec driver needs to add "dtoverlay" in /boot//config.txt. Can we do it using modprobe command for TLV320AIC3254-Q1..?

Thanks,

shrikant

Hi Shrikant,

I can see TI's SND_SOC_TLV320AIC32X4 kernel config in 4.9 kernel downloaded from official RPi git hub. I am referring bcmrpi_defconfig kernel config file. So, it should be possible for you to enable this driver for Pi.


thanks,
Prabhuraj
BlackPepper Technollogies

Ok.

You mean to say i need to configure kernel and after that it will be loaded automatically..?

Does it will support Linux ALSA library and utilities...?

Thanks,

shrikant

Hi Shrikant,

Ideally, you can enable TLV320.. from the kernel configs.

There are dedicated Raspberry Pi forums which will help you regarding ALSA.

thanks,
prabhuraj
BlackPepper Technologies

Hi Shrikant,

Yes, it should be possible to use ALSA library straight away for using the TLV320AIC32x4 codec. You need to enable the TLV320AIC32x4 in kernel configuration as suggested

You need to enable in dts, an entry for the same with compatible  e.g. (this is just an example and will vary in rasp pi for other platforms like i2c number and pinctrl):  

&i2c2 {

   pinctrl-names = "default";

   pinctrl-0 = <&i2c2_pins &sc16is7xx_pins>;

   status = "okay";

   clock-frequency = <100000>;

   tlv320aic32x4: tlv320aic32x4@18 {

       compatible = "ti,tlv320aic32x4";

       reg = <0x18>;

       status = "okay";

   };

};

Need to mention about the codec in sound framework in dts like e.g. (again sample one, it will vary for rasp pi):

    sound {
        compatible = "ti,beaglebone-black-audio";
        ti,model = "TI BeagleBone Black";
        ti,audio-codec = <&tlv320aic32x4>;
        ti,mcasp-controller = <&mcasp0>;
        ti,codec-clock-rate = <12000000>;
        ti,audio-routing =
            "Headphone Jack",       "HPLOUT",
            "Headphone Jack",       "HPROUT",
            "LINE1L",               "Line In",
            "LINE1R",               "Line In";
        clock-names = "mclk";
    };

In addition you need to take care of pin muxing and clocking for I2C and I2S in device tree.

There is one file in kernel source code tlv320aic32x4.txt which contains:

The tlv320aic32x4 serial control bus communicates through I2C protocols

Required properties:
- compatible: Should be "ti,tlv320aic32x4"
- reg: I2C slave address
- supply-*: Required supply regulators are:
"iov" - digital IO power supply
"ldoin" - LDO power supply
"dv" - Digital core power supply
"av" - Analog core power supply
If you supply ldoin, dv and av are optional. Otherwise they are required
See regulator/regulator.txt for more information about the detailed binding
format.

Optional properties:
- reset-gpios: Reset-GPIO phandle with args as described in gpio/gpio.txt
- clocks/clock-names: Clock named 'mclk' for the master clock of the codec.
See clock/clock-bindings.txt for information about the detailed format.


Example:

codec: tlv320aic32x4@18 {
compatible = "ti,tlv320aic32x4";
reg = <0x18>;
clocks = <&clks 201>;
clock-names = "mclk";
};


Does it will help for writing dts file ?

Yes, you can refer this and write your dts.

thanks,
Prabhuraj
BlackPepper Technologies

Hi,
Yes it should help.

i am new to dtoverlay and dts file structure.

Can you please help/guide  for writing .dts file for  TLV320AIC3254 on raspbery pi ...?

Thanks,

Shrikant

Hi Shrikant,

This is TI forum. DTS is slightly different way done for rasp pi from the common way. To get rasp pi specific queries addressed, would suggest you to post rasp pi forum for quick response. www.raspberrypi.org/.../ 

ok Dwarakesh. Thanks for help.
I will check raspberry pi forums for this.

Hi ,

Can you please provide any sample TLV320AIC3254 dts file any board like beagle-bone or any TI' any board ?
So that i can refer and write my own for raspberry pi ?

Thanks,
Shrikant

Hi Shrikant,

tlv320aic32x4.txt that you shared is a good starting point. I am not able to find the exact TI codec module in any of the DTS files that I have, to give as an example. Snippet I shared in previous post could also be used for reference. Also with tlv320aic32x4.txt as main reference and by checking how, other codec like tlv320aic3x, tlv320aic3111, tlv320aic3106 as references you can check how to configure dts. Entries for these codec are already available in dts files for various architectures under under arch/arm/boot/dts folder. Just grep for them.

Hi,

I can't see   TI's SND_SOC_TLV320AIC32X4 kernel config in 4.9 kernel.

I did  "make menuconfig" and then .config is created and in that file only following entries :  

CONFIG_SND_SOC_TLV320AIC23=m
CONFIG_SND_SOC_TLV320AIC23_I2C=m
CONFIG_SND_SOC_TLV320AIC23_SPI=m
CONFIG_SND_SOC_TLV320AIC31XX=m
CONFIG_SND_SOC_TLV320AIC3X=m

how you got entry for SND_SOC_TLV320AIC32X4 ?

Thanks,

shrikant

Hi Shrikant,

Copy bcmrpi_defconfig file(I assume this is your defconfig file, if any other, please check in that) from arch/arm/configs to .config file. Then do make menuconfig ARCH=arm
Now search for SND_SOC_TLV320AIC32X4. You should find it.

Thanks,
Prabhuraj
blackPepper Technologies