Re: [alsa-devel] Imx6 i2s master driver without i2c

9 May 2016


      On Mon, May 9, 2016 at 4:17 AM, nick83ola nick83ola@gmail.com wrote:
...
Dear Alsa, Caleb and Arnaud
I need to output an i2s master stream from my IMX6 solo board
my board have this configuration for sound: (it have an sgtl5000 codec not
on module, but on dev board)
==========================================================================
sound {
        compatible = "fsl,imx6q-icore-sgtl5000",
                 "fsl,imx-audio-sgtl5000";
        model = "imx6q-icore-sgtl5000";
        ssi-controller = <&ssi1>;
        audio-codec = <&codec>;
        audio-routing =
           "MIC_IN", "Mic Jack",
            "Mic Jack", "Mic Bias",
            "Headphone Jack", "HP_OUT";
        mux-int-port = <2>;
        mux-ext-port = <4>;
    };
&ssi1 {
    fsl,mode = "i2s-master";
    status = "okay";
};
&audmux {
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_audmux_4>;
    status = "okay";
};
&iomuxc {
    audmux {
        pinctrl_audmux_4: audmux-4 {
            fsl,pins = <
                MX6QDL_PAD_DISP0_DAT20__AUD4_TXC  0x130b0
                MX6QDL_PAD_DISP0_DAT21__AUD4_TXD 0x110b0
                MX6QDL_PAD_DISP0_DAT22__AUD4_TXFS  0x130b0
                MX6QDL_PAD_DISP0_DAT23__AUD4_RXD  0x130b0
            >;
       };
  };
==========================================================================
I need to output i2s on the same port as sgtl5000, bit in master mode
i've patched sound/soc/soc-utils.c to add support for dts as per arnaud
patch
==========================================================================
#ifdef CONFIG_OF
static const struct of_device_id soc_dummy_ids[] = {
    { .compatible = "linux,snd-soc-dummy", },
    { }
};
MODULE_DEVICE_TABLE(of, soc_dummy_ids);
#endif
...
.of_match_table = of_match_ptr(soc_dummy_ids),
==========================================================================
--> (it is necessary?????? or can I use simple audio card??????
-> i've put this in my dts file
==========================================================================
&audmux {
    ssi3 {
        fsl,audmux-port = <6>;
        fsl,port-config = <
             0x00000000
             IMX_AUDMUX_V2_PDCR_RXDSEL(4)
         >;
     };
 port5 {
     fsl,audmux-port = <4>;
     fsl,port-config = <
         (IMX_AUDMUX_V2_PTCR_TFSDIR |
         IMX_AUDMUX_V2_PTCR_TFSEL(6) |
         IMX_AUDMUX_V2_PTCR_TCLKDIR |
         IMX_AUDMUX_V2_PTCR_TCSEL(6))
         IMX_AUDMUX_V2_PDCR_RXDSEL(6)
     >;
 };

};
&ssi1 {
     status = "disabled";
};
&ssi2 {
     status = "disabled";
};
&ssi3 {
     status = "okay";
     #sound-dai-cells = <0>;
     // select the a clock parent suitable for 48000 Hz sampling rate
     assigned-clocks = <&clks IMX6QDL_CLK_SSI3_SEL>, <&clks
IMX6QDL_CLK_SSI3>;
     assigned-clock-parents = <&clks IMX6QDL_CLK_PLL4_AUDIO_DIV>;
     assigned-clock-rates = <0>, <49152000>;
};
/ {
    model = "Engicam i.CoreM6 DualLite/Solo starterkit";
    compatible = "fsl,imx6-icore", "fsl,imx6dl";
sound{
 status = "disabled";
};

sound-itel {
    compatible = "simple-audio-card";
    simple-audio-card,name = "test";
    simple-audio-card,format="dsp_a";
    simple-audio-card,frame-master = <&sound2_ssi>;
    simple-audio-card,bitclock-master = <&sound2_ssi>;
    sound2_ssi: simple-audio-card,cpu {
        sound-dai = <&ssi3>;
        system-clock-frequency = <1536000>;
        dai-tdm-slot-num = <2>;
        dai-tdm-slot-width = <16>;
    };
};

};
here's my log
/sound-itel/simple-audio-card,cpu: arguments longer than property
asoc-simple-card sound-itel.31: parse error -22
asoc-simple-card: probe of sound-itel.31 failed with error -22
Hi Nikola,
   Here is my working setup for a wandboard with no i2c codecs.
https://github.com/ccrome/linux-caleb-dev/blob/v4.5-caleb-wandboard/arch/arm...
You need to be sure to set up the audmux right.    I'm not sure with
that old kernel if everything with audmux works right or not -- I
haven't tested it.
That should get you pretty close to what you need for your board I suspect.
That branch (v4.5-caleb-wandboard) will build and run the SSI3 port on
AUD5 port, with the mx6 in master mode.  And, with all arnaud's
patches (included already in that repo), it will actually be robust.
-caleb
...
2016-05-06 17:38 GMT+02:00 Caleb Crome caleb@crome.org:
...
Hi there,
   Arnaud had a neat patch here that lets you set up a dummy sound
card from the DTS.
http://mailman.alsa-project.org/pipermail/alsa-devel/2015-November/100896.ht...
With that patch, you can set up your DTS to simply start streaming, no
codec or anything required, which should work for a codec with no I2C.
Hope that helps,
  -Caleb
On Thu, May 5, 2016 at 12:56 PM, nick83ola nick83ola@gmail.com wrote:
...
Hello Alsa dev!
Anyone have an example of an i2s only driver for imx6 solo? I need a
driver
without i2c....
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