PCM1864EVM: Combination of Beaglebone Black to access all four microphones by TDM

Hi Team,

Customer is having trouble in implementing their application in PCM1864EVM. Below is the details.

"

We are using PCM1864EVM with combination of Beaglebone Black to access all four microphones by TDM.

To achive that, we are using TI SDK Linux Processor. We are compiling Linux Kernel with pcm5102a.c driver

//pcm5102a.c
/*
* Driver for the PCM5102A codec
*
* Author: Florian Meier 
* Copyright 2013
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/

#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <sound/soc.h>

static struct snd_soc_dai_driver pcm5102a_dai = {
.name = "pcm5102a-hifi",
.playback = {
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S24_LE |
SNDRV_PCM_FMTBIT_S32_LE
},
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 4,
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S24_LE |
SNDRV_PCM_FMTBIT_S32_LE
},
};

static struct snd_soc_component_driver soc_component_dev_pcm5102a = {
.idle_bias_on = 1,
.use_pmdown_time = 1,
.endianness = 1,
.non_legacy_dai_naming = 1,
};

static int pcm5102a_probe(struct platform_device *pdev)
{
return devm_snd_soc_register_component(&pdev->dev, &soc_component_dev_pcm5102a,
&pcm5102a_dai, 1);
}

static const struct of_device_id pcm5102a_of_match[] = {
{ .compatible = "ti,pcm5102a", },
{ }
};
MODULE_DEVICE_TABLE(of, pcm5102a_of_match);

static struct platform_driver pcm5102a_codec_driver = {
.probe = pcm5102a_probe,
.driver = {
.name = "pcm5102a-codec",
.of_match_table = pcm5102a_of_match,
},
};

module_platform_driver(pcm5102a_codec_driver);

MODULE_DESCRIPTION("ASoC PCM5102A codec driver");
MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
MODULE_LICENSE("GPL v2");

and also compile the .dts file with information about the codec and mcasp1 pins

//pcm5102a.dtsi
&am33xx_pinmux {
mcasp1_pins: mcasp1_pins {
pinctrl-single,pins = <
/* sink must enable receivers */
AM33XX_IOPAD(0x9a0, PIN_INPUT_PULLDOWN | MUX_MODE3)
AM33XX_IOPAD(0x9a4, PIN_INPUT_PULLDOWN | MUX_MODE3)
AM33XX_IOPAD(0x9a8, PIN_INPUT_PULLDOWN | MUX_MODE3)
>;
};
};
&mcasp1 {
#sound-dai-cells = <0>;
pinctrl-names = "default";
pinctrl-0 = <&mcasp1_pins>;
status = "okay";
op-mode = <0>; /* MCASP_IIS_MODE */
tdm-slots = <4>;
num-serializer = <4>;
serial-dir = < /* 1 TX 2 RX 0 unused */
2 0 0 0
>;
rx-num-evt = <32>;
tx-num-evt = <32>;
};
/ {
pcm5102a: pcm5102a {
#sound-dai-cells = <0>;
compatible = "ti,pcm5102a";
status = "okay";
};
sound1: sound@1 {
compatible = "simple-audio-card";
simple-audio-card,name = "PCM5102a";
simple-audio-card,format = "dsp_a";
simple-audio-card,bitclock-master = <&sound1_master>;
simple-audio-card,frame-master = <&sound1_master>;
simple-audio-card,cpu {
sound-dai = <&mcasp1>;
};
sound1_master: simple-audio-card,codec {
#sound-dai-cells = <0>;
sound-dai = <&pcm5102a>;
clocks = <&mcasp1_fck>;
clock-names = "mclk";
};
};
};

Cutting it short, we can only access 4 TDM channels only, when we configure the registers using GUI (PurePath Console 2) on Windows. Sending registers by I2C on BBB doesnt work

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Thank you in advance.

Regards,
Maynard