Is there a way to enable I2S Rock64 DAC on a mainline kernel or on the ayufan-rock64 4.4 kernel?

[mikhailian]

The title says it all.

I guess this requires fiddling with device tree, but I am not knowledgeable enough to figure out what to change. And the documentation on Rock64 wiki seems to be lacking.

[ayufan]

@mikhailian Do you talk about enabling spdif on i2s?

[mikhailian]

Nope, I am trying to get RCA analog output.

I booted mainline Arch Linux kernel 5.11 and did not see the audio hat.

Tried with latest Armbian 5.10-21-rockchip64 and saw no audio hat either.

I can switch the built-in audio in mainline Arch Linux kernel before 5.12 with the following trick:

fdtput -t s /boot/dtbs/rockchip/rk3328-rock64.dtb /analog-sound status okay
reboot

Then, aplay -l shows the following both with and without the DAC hat. I assume this is built-in audio.

**** List of PLAYBACK Hardware Devices ****
card 0: rockchiprk3328 [rockchip,rk3328], device 0: ff000000.i2s-i2s-hifi i2s-hifi-0 [ff000000.i2s-i2s-hifi i2s-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: rockchiprk3328 [rockchip,rk3328], device 1: ff010000.i2s-rk3328-hifi ff410000.codec-1 [ff010000.i2s-rk3328-hifi ff410000.codec-1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: rockchiprk3328 [rockchip,rk3328], device 2: ff030000.spdif-dit-hifi dit-hifi-2 [ff030000.spdif-dit-hifi dit-hifi-2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

This is a ES9023-based DAC, I tried find /usr -name '9023'` but this gives no results.

Don't know where to start exploring from there.

[ayufan]

@mikhailian

So, you try to connect to A/C output?

There's a bunch of different outputs on this board:

• HDMI sound
• RCA on a HiFi shield
• Headphone jack on a HiFi shield
• A/V Jack

I guess, we talk about RCA on a HiFi shield: these two goldplated connectors?

[ayufan]

@mikhailian

From what I see the RCA on HiFi shield should be on i2s1, which is ff010000.i2s-rk3328-hifi. Can you try playing through this device? Can you also change J4 from L and H and vice-versa? This impacts a clock source of ES9023.

[mikhailian]

I tried all combinations of jumpers on the latest Armbian with kernel 5.10, but the only sound output that works is card0, device 1, which is the built-in audio.

Willing to try with the latest Linux mainline kernel, I wrote Arch Linux Arm to the emmc card, booted with it and I now see the following:

uname -a
Linux alarm 5.12.0-rc3-3-ARCH #2 SMP Thu Mar 18 00:37:31 UTC 2021 aarch64 GNU/Linux
[root@alarm alarm]# aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
default:CARD=Analog
    Analog, ff010000.i2s-rk3328-hifi ff410000.codec-0
    Default Audio Device
sysdefault:CARD=Analog
    Analog, ff010000.i2s-rk3328-hifi ff410000.codec-0
    Default Audio Device
default:CARD=HDMI
    HDMI, ff000000.i2s-i2s-hifi i2s-hifi-0
    Default Audio Device
sysdefault:CARD=HDMI
    HDMI, ff000000.i2s-i2s-hifi i2s-hifi-0
    Default Audio Device

As much as I understand this, i2s bus is not even enabled, so I searched around, found your dtedit script, extracted the current device tree, found

        i2s@ff020000 {
                compatible = "rockchip,rk3328-i2s\0rockchip,rk3066-i2s";
                reg = <0x00 0xff020000 0x00 0x1000>;
                interrupts = <0x00 0x1c 0x04>;
                clocks = <0x02 0x2b 0x02 0x139>;
                clock-names = "i2s_clk\0i2s_hclk";
                dmas = <0x10 0x00 0x10 0x01>;
                dma-names = "tx\0rx";
                #sound-dai-cells = <0x00>;
                status = "disabled";
                phandle = <0x6c>;
        };`

changed the status to okay, created the dtb file and wrote it to /boot/dtbs/rockchip/rk3328-rock64.dtb. Then I checked that is is picked by the kernel by comparing the old device tree to the new.

After all these manipulations aplay -L still shows

[root@alarm ~]# aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
default:CARD=Analog
    Analog, ff010000.i2s-rk3328-hifi ff410000.codec-0
    Default Audio Device
sysdefault:CARD=Analog
    Analog, ff010000.i2s-rk3328-hifi ff410000.codec-0
    Default Audio Device
default:CARD=HDMI
    HDMI, ff000000.i2s-i2s-hifi i2s-hifi-0
    Default Audio Device
sysdefault:CARD=HDMI
    HDMI, ff000000.i2s-i2s-hifi i2s-hifi-0
    Default Audio Device

dmesg does not seem to complain about i2s

[root@alarm ~]# dmesg -l err
[    2.566197] rockchip-pinctrl pinctrl: pin gpio0-2 already requested by vcc-host-5v-regulator; cannot claim for vcc-host1-5v-regulator
[    2.567342] rockchip-pinctrl pinctrl: pin-2 (vcc-host1-5v-regulator) status -22
[    2.568014] rockchip-pinctrl pinctrl: could not request pin 2 (gpio0-2) from group usb20-host-drv  on device rockchip-pinctrl
[    2.569054] reg-fixed-voltage vcc-host1-5v-regulator: Error applying setting, reverse things back
[    3.534716] gpio-syscon ff100000.syscon:grf-gpio: can't read the data register offset!
[    7.510715] rk_gmac-dwmac ff540000.ethernet: cannot get clock clk_mac_speed

nor does it tell anything about i2s.

[root@alarm ~]# dmesg |grep mclk
[root@alarm ~]# 

[mikhailian]

Here is the gist with the complete device tree.

[dantheperson]

Also interested in this. I used to have this working on armbian, but then moved house a few times and it went in a packing box for a while. Trying to resurect it with the latest armbian no luck.

Today i tried volumio instead and bingo DAC shield RCA outputs work.

volumio@volumio:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: HDMI [HDMI], device 0: ff000000.i2s-i2s-hifi i2s-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: I2S [I2S], device 0: ff010000.i2s-rk3328-hifi rk3328-hifi-0 []
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 1: I2S [I2S], device 1: ff010000.i2s-snd-soc-dummy-dai snd-soc-dummy-dai-1 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: SPDIF [SPDIF], device 0: ff030000.spdif-dit-hifi dit-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
volumio@volumio:~$ uname -a
Linux volumio 4.4.154 #1 SMP Tue Oct 13 11:37:38 CEST 2020 aarch64 GNU/Linux