i.MX Processors中的主题 Using ESAI1 Interface to connect I2S from another board as an ALSA card in iMX8QMMEK

Using ESAI1 Interface to connect I2S from another board as an ALSA card in iMX8QMMEK

mustafa_ozcelik — Wed, 31 Jul 2019 12:24:37 GMT

I am trying to initialize ESAI1 interface on iMX8QMMEK so that it reads I2S from another board.

Our custom board has the following wiring:

SC_P_ESAI1_SCKR_AUD_ESAI1_SCKR <---------------------- WS
(iMX8QMMEK) SC_P_ESAI1_TX5_RX0_AUD_ESAI1_TX5_RX0 <------------- DATA (Board with I2S Out)

SC_P_ESAI1_FSR_AUD_ESAI1_FSR <--------------------------- BCK

Reading from examples, I came up with the following devicetree configuration (I use 4.14-sumo, release: fsl-imx8qm.dtsi\freescale\dts\boot\arm64\arch - linux-imx - i.MX Linux kernel ) :

   sound-custom {
       compatible = "simple-audio-card";
       simple-audio-card,name = "Custom_Sound_Card";
       simple-audio-card,format = "i2s";
       simple-audio-card,bitclock-master = <&dailink_master>;
       simple-audio-card,frame-master = <&dailink_master>;
       status = "okay";
       simple-audio-card,cpu {
           sound-dai = <&esai1>;
       };
       dailink_master: simple-audio-card,codec {
           sound-dai = <&codec_test>;
       };
   };
   codec_test: codec_test {
        compatible = "linux,snd-soc-dummy";
        #sound-dai-cells = <0>;
        status="okay";
   };
pinctrl_esai1: esai1grp {
               fsl,pins = <
                   SC_P_ESAI1_FSR_AUD_ESAI1_FSR       0xc6000040
                   SC_P_ESAI1_FST_AUD_ESAI1_FST       0xc6000040
                   SC_P_ESAI1_SCKR_AUD_ESAI1_SCKR       0xc6000040
                   SC_P_ESAI1_SCKT_AUD_ESAI1_SCKT       0xc6000040
                   SC_P_ESAI1_TX0_AUD_ESAI1_TX0       0xc6000040
                   SC_P_ESAI1_TX1_AUD_ESAI1_TX1       0xc6000040
                   SC_P_ESAI1_TX2_RX3_AUD_ESAI1_TX2_RX3   0xc6000040
                   SC_P_ESAI1_TX3_RX2_AUD_ESAI1_TX3_RX2   0xc6000040
                   /*SC_P_ESAI1_TX4_RX1_AUD_ESAI1_TX4_RX1   0xc6000040*/ /* This pin is used by another device, I commented it */
                   SC_P_ESAI1_TX5_RX0_AUD_ESAI1_TX5_RX0   0xc6000040
               >;
           };
esai1: esai@59810000 {
   compatible = "fsl,imx8qm-esai";
   reg = <0x0 0x59810000 0x0 0x10000>;
   interrupts = <GIC_SPI 411 IRQ_TYPE_LEVEL_HIGH>;
   clocks = <&clk IMX8QM_AUD_ESAI_1_IPG>,
       <&clk IMX8QM_AUD_ESAI_1_EXTAL_IPG>,
       <&clk IMX8QM_AUD_ESAI_1_IPG>,
       <&clk IMX8QM_CLK_DUMMY>;
   clock-names = "core", "extal", "fsys", "spba";
   dmas = <&edma3 6 0 1>, <&edma3 7 0 0>;
   dma-names = "rx", "tx";
   status = "disabled";
   power-domains = <&pd_esai1>;
};
&esai1 {
   pinctrl-names = "default";
   pinctrl-0 = <&pinctrl_esai1>;
   assigned-clocks = <&clk IMX8QM_ACM_ESAI1_MCLK_SEL>,
           <&clk IMX8QM_AUD_PLL0_DIV>,
           <&clk IMX8QM_AUD_ACM_AUD_PLL_CLK0_DIV>,
           <&clk IMX8QM_AUD_ACM_AUD_REC_CLK0_DIV>,
           <&clk IMX8QM_AUD_ESAI_1_EXTAL_IPG>;
   assigned-clock-parents = <&clk IMX8QM_AUD_ACM_AUD_PLL_CLK0_CLK>;
   assigned-clock-rates = <0>, <786432000>, <49152000>, <24576000>, <49152000>;
   fsl,txm-rxs;
   status = "okay";
};

Unfortunately, there is no additional ALSA card showing up with the command "aplay -l". No warning or indication in "dmesg". Being able to configure esai and see a ALSA card are the first steps for me.

Another question is whether or not if using &esai1 phandle is possible with "simple-sound-card" driver.
I am quite new with this audio interfacing. I want to receive PCM data to ALSA (somehow). Is that possible? Any suggestions are greatly appreciated.

Re: Using ESAI1 Interface to connect I2S from another board as an ALSA card in iMX8QMMEK

igorpadykov — Wed, 31 Jul 2019 23:06:49 GMT

Hi Mustafa

one can try to use "sound-cs42888" :

fsl-imx8qm-ddr4-arm2.dts\freescale\dts\boot\arm64\arch - linux-imx - i.MX Linux kernel

nxp does not support "simple-audio-card", may be useful look on

https://community.nxp.com/thread/337305

Best regards
igor
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Re: Using ESAI1 Interface to connect I2S from another board as an ALSA card in iMX8QMMEK

mustafa_ozcelik — Thu, 01 Aug 2019 05:46:02 GMT

I have a question. Will I be able to use cs42888 codec for esai1, even though I dont have cs42888 card on my custom iMX board? I intend to use it by modifying a few things.

Re: Using ESAI1 Interface to connect I2S from another board as an ALSA card in iMX8QMMEK

igorpadykov — Thu, 01 Aug 2019 06:48:25 GMT

I think you should analyze driver and remove codes for cs42888, check for

possible clocks provided by cs42888, replacing them for internally generated.

Best regards
igor

Re: Using ESAI1 Interface to connect I2S from another board as an ALSA card in iMX8QMMEK

mustafa_ozcelik — Mon, 05 Aug 2019 06:04:56 GMT

Do you think it is possible to use imx-esai.c as suggested here https://community.nxp.com/message/516818 for this task? Is there any devicetree examples of using ESAI for I2S input? Thanks

Re: Using ESAI1 Interface to connect I2S from another board as an ALSA card in iMX8QMMEK

igorpadykov — Mon, 05 Aug 2019 06:41:56 GMT

in general yes as ESAI block is the same as in i.MX6Q.

Best regards
igor