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131 lines
3.5 KiB
Diff
131 lines
3.5 KiB
Diff
From 5962d99b5efed4297ed5c1807d21b406ab86aef1 Mon Sep 17 00:00:00 2001
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From: wavelet2 <20504977+wavelet2@users.noreply.github.com>
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Date: Mon, 15 Apr 2019 10:00:20 +0100
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Subject: [PATCH] Maxim MAX98357A I2S DAC overlay (#2935)
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Add overlay for Maxim MAX98357A I2S DAC.
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Signed-off-by: Richard Steedman <richard.steedman@gmail.com>
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 9 ++
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.../boot/dts/overlays/max98357a-overlay.dts | 84 +++++++++++++++++++
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3 files changed, 94 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/max98357a-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -75,6 +75,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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justboom-dac.dtbo \
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justboom-digi.dtbo \
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ltc294x.dtbo \
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+ max98357a.dtbo \
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mbed-dac.dtbo \
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mcp23017.dtbo \
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mcp23s17.dtbo \
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -1276,6 +1276,15 @@ Params: ltc2941 Select t
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See the datasheet for more information.
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+Name: max98357a
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+Info: Configures the Maxim MAX98357A I2S DAC
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+Load: dtoverlay=max98357a,<param>=<val>
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+Params: no-sdmode Driver does not manage the state of the DAC's
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+ SD_MODE pin (i.e. chip is always on).
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+ sdmode-pin integer, GPIO pin connected to the SD_MODE input
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+ of the DAC (default GPIO4 if parameter omitted).
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+
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+
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Name: mbed-dac
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Info: Configures the mbed AudioCODEC (TLV320AIC23B)
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Load: dtoverlay=mbed-dac
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/max98357a-overlay.dts
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@@ -0,0 +1,84 @@
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+// Overlay for Maxim MAX98357A audio DAC
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+
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+// dtparams:
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+// no-sdmode - SD_MODE pin not managed by driver.
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+// sdmode-pin - Specify GPIO pin to which SD_MODE is connected (default 4).
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+
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
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+
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+ /* Enable I2S */
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+ fragment@0 {
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+ target = <&i2s>;
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+ __overlay__ {
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+ status = "okay";
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+ };
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+ };
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+
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+ /* DAC whose SD_MODE pin is managed by driver (via GPIO pin) */
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+ fragment@1 {
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+ target-path = "/";
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+ __overlay__ {
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+ max98357a_dac: max98357a {
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+ compatible = "maxim,max98357a";
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+ #sound-dai-cells = <0>;
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+ sdmode-gpios = <&gpio 4 0>; /* 2nd word overwritten by sdmode-pin parameter */
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+ status = "okay";
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+ };
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+ };
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+ };
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+
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+ /* DAC whose SD_MODE pin is not managed by driver */
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+ fragment@2 {
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+ target-path = "/";
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+ __dormant__ {
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+ max98357a_nsd: max98357a {
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+ compatible = "maxim,max98357a";
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+ #sound-dai-cells = <0>;
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+ status = "okay";
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+ };
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+ };
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+ };
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+
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+ /* Soundcard connecting I2S to DAC with SD_MODE */
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+ fragment@3 {
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+ target = <&sound>;
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+ __overlay__ {
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+ compatible = "simple-audio-card";
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+ simple-audio-card,format = "i2s";
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+ simple-audio-card,name = "MAX98357A";
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+ status = "okay";
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+ simple-audio-card,cpu {
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+ sound-dai = <&i2s>;
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+ };
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+ simple-audio-card,codec {
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+ sound-dai = <&max98357a_dac>;
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+ };
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+ };
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+ };
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+
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+ /* Soundcard connecting I2S to DAC without SD_MODE */
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+ fragment@4 {
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+ target = <&sound>;
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+ __dormant__ {
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+ compatible = "simple-audio-card";
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+ simple-audio-card,format = "i2s";
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+ simple-audio-card,name = "MAX98357A";
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+ status = "okay";
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+ simple-audio-card,cpu {
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+ sound-dai = <&i2s>;
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+ };
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+ simple-audio-card,codec {
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+ sound-dai = <&max98357a_nsd>;
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+ };
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+ };
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+ };
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+
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+ __overrides__ {
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+ no-sdmode = <0>,"-1+2-3+4";
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+ sdmode-pin = <&max98357a_dac>,"sdmode-gpios:4";
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+ };
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+};
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