Thank you for your replies! I hope you dont mind me tagging both of you at the same time, more minds the better! So far i have an ADAU1978 and a CS4344 DAC connected to the I2C and I2S lines (CODECs are quite hard to buy at the moment!) I can record 4 channel audio from the ADC as the ADAU can use the LRCLK for the PLL. The DAC however needs a MCLK at a multiple of the LRCLK frequency. @eragefe to answer your question i have scoped the MCLK, LRCLK and BCLK and seen that the DMIC overlay (pasted below) does toggle the MCLK pin but none of the others, this might be because the same pin is used for PCM CLK? It is interesting how you have used the MCLK as an input, is that in your existing overlay and how do you use it? I saw your question. Sadly as im mostly a hardware background i know very little about writing and reading these device trees. My application is quite unique. Im using the ADCs to measure magnetic fields in multiple axis to perform various DSP functions. The DACs can inject signals into the antennas so therefore need to be synchronised. I couldnt upload the overlay however it can be sound in the dtb/overlays folder within the boot directory of the kernal. If you could take a look and see what needs to change to enable that output that would be great. The low level registers in the CPU all seem to bet set up correctly.
Thanks
Josh
/dts-v1/;
/ {
model = “Radxa ROCK Pi S”;
compatible = “radxa,rockpis-rk3308\0rockchip,rk3308”;
fragment@0 {
target-path = [ 2f 00 ];
__overlay__ {
pdm-i2s-dais {
status = "okay";
#sound-dai-cells = < 0x00 >;
compatible = "rockchip,rk3308-multi-dais\0rockchip,multi-dais";
dais = < 0xffffffff 0xffffffff >;
capture,channel-mapping = < 0x08 0x00 >;
playback,channel-mapping = < 0x00 0x08 >;
bitclock-inversion = < 0x00 0x00 >;
phandle = < 0x01 >;
};
vad-sound {
status = "okay";
compatible = "rockchip,multicodecs-card";
rockchip,card-name = "rockchip,rk3308-vad";
rockchip,cpu = < 0x01 >;
rockchip,codec = < 0xffffffff 0xffffffff >;
};
};
};
fragment@1 {
target = < 0xffffffff >;
__overlay__ {
status = "disabled";
};
};
fragment@2 {
target = < 0xffffffff >;
__overlay__ {
status = "okay";
rockchip,audio-src = < 0xffffffff >;
rockchip,det-channel = < 0x00 >;
rockchip,mode = < 0x01 >;
rockchip,buffer-time-ms = < 0xc8 >;
#sound-dai-cells = < 0x00 >;
};
};
fragment@3 {
target = < 0xffffffff >;
__overlay__ {
status = "okay";
#sound-dai-cells = < 0x00 >;
rockchip,no-dmaengine;
pinctrl-names = "default";
pinctrl-0 = < 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff >;
};
};
fragment@4 {
target = < 0xffffffff >;
__overlay__ {
rockchip,no-dmaengine;
};
};
__symbols__ {
pdm_i2s_dais = "/fragment@0/__overlay__/pdm-i2s-dais";
};
__fixups__ {
pdm_8ch = "/fragment@0/__overlay__/pdm-i2s-dais:dais:0\0/fragment@2/__overlay__:rockchip,audio-src:0\0/fragment@3:target:0";
i2s_8ch_2 = "/fragment@0/__overlay__/pdm-i2s-dais:dais:4\0/fragment@4:target:0";
acodec = "/fragment@0/__overlay__/vad-sound:rockchip,codec:0";
vad = "/fragment@0/__overlay__/vad-sound:rockchip,codec:4\0/fragment@2:target:0";
acodec_sound = "/fragment@1:target:0";
pdm_m2_clk = "/fragment@3/__overlay__:pinctrl-0:0";
pdm_m2_clkm = "/fragment@3/__overlay__:pinctrl-0:4";
pdm_m2_sdi0 = "/fragment@3/__overlay__:pinctrl-0:8";
pdm_m2_sdi1 = "/fragment@3/__overlay__:pinctrl-0:12";
pdm_m2_sdi2 = "/fragment@3/__overlay__:pinctrl-0:16";
pdm_m2_sdi3 = "/fragment@3/__overlay__:pinctrl-0:20";
};
__local_fixups__ {
fragment@0 {
__overlay__ {
vad-sound {
rockchip,cpu = < 0x00 >;
};
};
};
};
};
