Dear tx,
I am a bit struggling with the I2S connection on the IMX8MPlus on SAI3. I want to use the max98357a driver (that I activated in Kconfig), and I disabled the pins already used for the backlight driver. Nothing is recognised at kernel boot. Do you have any idea about the issue ?
My dtsi are like this:
/* VERDIN I2S_2 */
&sai3 {
#sound-dai-cells = <0>;
assigned-clocks = <&clk IMX8MP_CLK_SAI3>;
assigned-clock-parents = <&clk IMX8MP_AUDIO_PLL1_OUT>;
assigned-clock-rates = <24576000>;
clocks = <&audiomix_clk IMX8MP_CLK_AUDIOMIX_SAI3_IPG>, <&clk IMX8MP_CLK_DUMMY>,
<&audiomix_clk IMX8MP_CLK_AUDIOMIX_SAI3_MCLK1>, <&clk IMX8MP_CLK_DUMMY>,
<&clk IMX8MP_CLK_DUMMY>;
clock-names = "bus", "mclk0", "mclk1", "mclk2", "mclk3";
fsl,sai-mclk-direction-output;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_sai3>;
status = "okay";
};
pinctrl_sai3: sai3grp {
fsl,pins = <
MX8MP_IOMUXC_SAI3_RXD__AUDIOMIX_SAI3_RX_DATA00 0x1d6 /* SODIMM 48 */
MX8MP_IOMUXC_SAI3_TXFS__AUDIOMIX_SAI3_TX_SYNC 0x1d6 /* SODIMM 44 */
MX8MP_IOMUXC_SAI3_TXC__AUDIOMIX_SAI3_TX_BCLK 0x1d6 /* SODIMM 42 */
MX8MP_IOMUXC_SAI3_TXD__AUDIOMIX_SAI3_TX_DATA00 0x96 /* SODIMM 46 */
>;
};
sound_card: sound-card {
compatible = "simple-audio-card";
simple-audio-card,bitclock-master = <&dailink_master>;
simple-audio-card,format = "i2s";
simple-audio-card,frame-master = <&dailink_master>;
simple-audio-card,name = "max98357a";
status = "okay";
simple-audio-card,widgets = "Speaker", "Speakers";
simple-audio-card,routing = "Speakers", "Speaker";
dailink_master: simple-audio-card,cpu {
sound-dai = <&sai3>;
/*system-clock-frequency = <&sound_osc 0>;*/
dai-tdm-slot-num = <2>;
dai-tdm-slot-width = <16>;
clocks = <&audiomix_clk IMX8MP_CLK_AUDIOMIX_SAI3_MCLK1>;
};
simple-audio-card,codec{
sound-dai = <&codec_ext>;
};
};
codec_ext: max98357a {
compatible = "maxim,max98357a";
};
Many thanks
Adrian
