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// Overlay for Maxim MAX98357A audio DAC
// dtparams:
// no-sdmode - SD_MODE pin not managed by driver.
// sdmode-pin - Specify GPIO pin to which SD_MODE is connected (default 4).
/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2835";
/* Enable I2S */
fragment@0 {
target = <&i2s>;
__overlay__ {
status = "okay";
};
};
/* DAC whose SD_MODE pin is managed by driver (via GPIO pin) */
fragment@1 {
target-path = "/";
__overlay__ {
max98357a_dac: max98357a {
compatible = "maxim,max98357a";
#sound-dai-cells = <0>;
sdmode-gpios = <&gpio 4 0>; /* 2nd word overwritten by sdmode-pin parameter */
status = "okay";
};
};
};
/* DAC whose SD_MODE pin is not managed by driver */
fragment@2 {
target-path = "/";
__dormant__ {
max98357a_nsd: max98357a {
compatible = "maxim,max98357a";
#sound-dai-cells = <0>;
status = "okay";
};
};
};
/* Soundcard connecting I2S to DAC with SD_MODE */
fragment@3 {
target = <&sound>;
__overlay__ {
compatible = "simple-audio-card";
simple-audio-card,format = "i2s";
simple-audio-card,name = "MAX98357A";
status = "okay";
simple-audio-card,cpu {
sound-dai = <&i2s>;
};
simple-audio-card,codec {
sound-dai = <&max98357a_dac>;
};
};
};
/* Soundcard connecting I2S to DAC without SD_MODE */
fragment@4 {
target = <&sound>;
__dormant__ {
compatible = "simple-audio-card";
simple-audio-card,format = "i2s";
simple-audio-card,name = "MAX98357A";
status = "okay";
simple-audio-card,cpu {
sound-dai = <&i2s>;
};
simple-audio-card,codec {
sound-dai = <&max98357a_nsd>;
};
};
};
__overrides__ {
no-sdmode = <0>,"-1+2-3+4";
sdmode-pin = <&max98357a_dac>,"sdmode-gpios:4";
};
};
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