From 8a063d9d7c86075dbae91ef353540ab7724cce35 Mon Sep 17 00:00:00 2001 From: wavelet2 <20504977+wavelet2@users.noreply.github.com> Date: Mon, 15 Apr 2019 10:00:20 +0100 Subject: [PATCH 428/725] Maxim MAX98357A I2S DAC overlay (#2935) Add overlay for Maxim MAX98357A I2S DAC. Signed-off-by: Richard Steedman --- arch/arm/boot/dts/overlays/Makefile | 1 + arch/arm/boot/dts/overlays/README | 9 ++ .../boot/dts/overlays/max98357a-overlay.dts | 84 +++++++++++++++++++ 3 files changed, 94 insertions(+) create mode 100644 arch/arm/boot/dts/overlays/max98357a-overlay.dts --- a/arch/arm/boot/dts/overlays/Makefile +++ b/arch/arm/boot/dts/overlays/Makefile @@ -75,6 +75,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \ justboom-dac.dtbo \ justboom-digi.dtbo \ ltc294x.dtbo \ + max98357a.dtbo \ mbed-dac.dtbo \ mcp23017.dtbo \ mcp23s17.dtbo \ --- a/arch/arm/boot/dts/overlays/README +++ b/arch/arm/boot/dts/overlays/README @@ -1276,6 +1276,15 @@ Params: ltc2941 Select t See the datasheet for more information. +Name: max98357a +Info: Configures the Maxim MAX98357A I2S DAC +Load: dtoverlay=max98357a,= +Params: no-sdmode Driver does not manage the state of the DAC's + SD_MODE pin (i.e. chip is always on). + sdmode-pin integer, GPIO pin connected to the SD_MODE input + of the DAC (default GPIO4 if parameter omitted). + + Name: mbed-dac Info: Configures the mbed AudioCODEC (TLV320AIC23B) Load: dtoverlay=mbed-dac --- /dev/null +++ b/arch/arm/boot/dts/overlays/max98357a-overlay.dts @@ -0,0 +1,84 @@ +// 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", "brcm,bcm2708", "brcm,bcm2709"; + + /* 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"; + }; +};