[yocto] IMX6Q add new sound simple sound card

Wed Jul 18 01:31:10 PDT 2018

Hi Nick,

moreover, I just tested the sound card with aplay command and this is the output:
--> ITEL imx-itel-hw-params NAME=202c000.ssi  
 VALUE=0x00004001 SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS

--> ITEL imx-itel-hw-params set tdm slots channels=20

--> ITEL imx-audmux-config set sysclk NAME=202c000.ssi
aplay: pcm_write:1940: write error: Input/output error

I'm working on an evaluation board of NXP, our hardware is not ready yet. Is this the reason of the fail?

Riccardo

----- Messaggio Originale -----
Da: "nick83ola" <nick83ola at gmail.com>
A: riccardo.casagrande at multiconn.it
Cc: yocto at yoctoproject.org
Data: 17/07/2018 11:24
Oggetto: Re: [Spam - Sospetto] Re: [yocto] IMX6Q add new sound simple sound card

Hi, 
the chip has his internal "codec" you can see from the datasheet that has an i2s for the audio and an i2c interface for configuration. 
the codec that you select ak4648 needs an initialization phase that is done usually via i2c.  
If the driver can't find the codec it will simply disable itself (and you don't see the alsa audio card)  

First try to make the dummy codec work. 
If its working you should be able to see that alsa recognize the dummy soundcard and to be able to play something and see the i2s signal on the board with an oscilloscope/logic analyzer 

After that you probably need to develop a codec driver for that particular chip. 

Probably the alsa mailing list is the right place to get help regarding this. 

You can have a look at my previous post on those topics (I was in the same boat as you :-) )  
https://community.nxp.com/thread/391216 

http://mailman.alsa-project.org/pipermail/alsa-devel/2016-May/108068.html 

Cheers 
Nick 

On Mon, 16 Jul 2018 at 10:38, Riccardo Casagrande < riccardo.casagrande at multiconn.it > wrote: 

Hello Nick 

the i.MX6Q is not connected to a codec but directly to 3 FDA2100 from STMicroelectronics, these chips are digital power amplifiers. On input I have 2 input from ADCs. 
I wrote several sound nodes but at moment the best result is no error at boot, the sound card listed under /proc/device-tree but not in alsa. 

This is the device-tree sub node 

sound-fda2100 { 
        compatible = "simple-audio-card"; 
        simple-audio-card,name = "MTC-FDA2100-Card"; 
        simple-audio-card,format = "i2s"; 
        simple-audio-card,widgets = 
            "Microphone", "Microphone Jack", 
            "Headphone", "Headphone Jack", 
            "Speaker", "External Speaker"; 
        simple-audio-card,routing = 
            "MIC_IN", "Microphone Jack", 
            "Headphone Jack", "HP_OUT", 
            "External Speaker", "LINE_OUT"; 

        simple-audio-card,bitclock-master = <&cpu_dai>; 
            simple-audio-card,frame-master = <&cpu_dai>; 
            cpu_dai: simple-audio-card,cpu { 
                sound-dai = <&ssi1 0>; 
            }; 
           codec_dai: simple-audio-card,codec { 
                sound-dai = <&codec_test>; 
            }; 
    }; 

codec_test: codec_test { 
    compatible = "linux,snd-soc-dummy"; 
        #sound-dai-cells = <0>; 
     }; 

And last week I found that "dummy codec is not supported in NXP linux release" as reported here https://community.nxp.com/thread/466938  

----- Messaggio Originale ----- 
Da: "nick83ola" < nick83ola at gmail.com > 
A: riccardo.casagrande at multiconn.it 
Cc: yocto at yoctoproject.org 
Data: 16/07/2018 10:37 
Oggetto: [Spam - Sospetto] Re: [yocto] IMX6Q add new sound simple sound card 

Hi, 
how is your sound card connected? 

If you look at the devicetree for a sound card to work you have to configure  

 - system clock
 - device that handle the communication with the sound card (f ex i2s, or i2c or usb, or whatever) (sound-dai) 

 - the soundcard itself (codec?)  
So you need more information regarding your hardware, the codec, how is connected, etc etc  

Look at the source of the simple audio card driver and maybe at some other driver in the kernel source 

Cheers  
Nick 

----------------------------------------------------------------------------------------------------- 

sound { 
simple-audio-card,cpu { 
sound-dai = <& sh_fsi2 0>; 
}; 

dailink0_master: simple-audio-card, codec { 
sound-dai = <& ak4648>; 
clocks = <& osc>; 
}; 
}; 

&i2c0 { 
ak4648: ak4648 at 12 { 
#sound-dai-cells = <0>; 
compatible = "asahi-kasei,ak4648";
reg = <0x12>; 
}; 
}; 

sh_fsi2: sh_fsi2 at ec230000 { 
#sound-dai-cells = <1>; 
compatible = "renesas,sh_fsi2";
reg = <0xec230000 0x400>; 
interrupt-parent = <&gic>; 
interrupts = <0 146 0x4>; 
}; 

On Thu, 5 Jul 2018 at 16:13, Riccardo Casagrande < riccardo.casagrande at multiconn.it  > wrote: 

Hello all, 

I'm new to Linux/Yocto world. I'm working on iMX6Q and I need to add a new sound card and recognized from alsamixer. 
I spent days on internet looking for examples and tutorials but at the moment alsa never see my sound card. 
This is one of the tutorials I followed https://elixir.bootlin.com/linux/v4.5/source/Documentation/devicetree/bindings/sound/simple-card.txt  

What I've done? 
- Activated support for generic sound board on menuconfig 
- Added new "sound" node in device tree file with minimal properties/subnotes 
- Compiled the kernel 
- Compiled and flashed the image 

but alsamixer still doesn't recognize my sound card, what am I missing? 

Thanks. 

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