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menu "Sound support"
config SOUND
bool "Enable sound support"
help
Support making sounds through an audio codec. This is normally a
beep at a chosen frequency for a selected length of time. However
the drivers support playing arbitrary sound samples using a
PCM interface.
Note: At present the sound setup is somewhat tangled up in that the
audio codecs are called from the sound-i2s code. This could be
converted to driver model.
config I2S
bool "Enable I2S support"
depends on SOUND
help
I2S is a serial bus often used to transmit audio data from the
SoC to the audio codec. This option enables sound support using
I2S. It calls either of the two supported codecs (no use is made
of driver model at present).
config I2S_ROCKCHIP
bool "Enable I2S support for Rockchip SoCs"
depends on I2S
help
Rockchip SoCs support an I2S interface for sending audio data to an
audio codec. This option enables support for this, using one of the
available audio codec drivers. This driver does not make use of
DMA, but writes each word directly to the hardware.
config I2S_SAMSUNG
bool "Enable I2C support for Samsung SoCs"
depends on I2S
help
Samsung Exynos SoCs support an I2S interface for sending audio
data to an audio codec. This option enables support for this,
using one of the available audio codec drivers. Enabling this
option provides an implementation for sound_init() and
sound_play().
config SOUND_I8254
bool "Intel i8254 timer / beeper"
depends on SOUND
help
This enables support for a beeper that uses the i8254 timer chip.
This can emit beeps at a fixed frequency. It is possible to control
the length of the beeps, by turning a beep on, waiting for a period
of time, then turning it off.
This is quite an old feature, called PIT (Programmable Interval
Timer), but is nonetheless still available on modern x86 machines.
config SOUND_INTEL_HDA
bool "Intel HDA audio codec"
depends on SOUND
help
Most Intel chips have an HDA (High-definition audio) codec which can
be used by U-Boot to play simple beeps. This is also sometimes called
Azalia which was the development code-name. It requires setup
information in the device tree (see intel-hda.txt).
config SOUND_IVYBRIDGE
bool "Intel Ivybridge sound support"
depends on SOUND
select SOUND_INTEL_HDA
help
Enable sound output on supported Intel Ivybridge-based boards. This
driver uses Intel's High-definition Audio (HDA) architecture,
sometimes called Azalia. The audio codec is detected using a
semi-automatic mechanism.
config I2S_TEGRA
bool "Enable I2S support for Nvidia Tegra SoCs"
depends on I2S
select TEGRA124_DMA
help
Nvidia Tegra SoCs support several I2S interfaces for sending audio
data to an audio codec. This option enables support for this,
using one of the available audio codec drivers.
config SOUND_MAX98088
bool "Support Maxim max98088 audio codec"
depends on I2S
help
Enable the max98088 audio codec. This is connected via I2S for
audio data and I2C for codec control. At present it only works
with the Samsung I2S driver.
config SOUND_MAX98090
bool "Support Maxim max98090 audio codec"
depends on I2S
help
Enable the max98090 audio codec. This is connected via I2S for
audio data and I2C for codec control. At present it only works
with the Samsung I2S driver.
config SOUND_MAX98095
bool "Support Maxim max98095 audio codec"
depends on I2S
help
Enable the max98095 audio codec. This is connected via I2S for
audio data and I2C for codec control. At present it only works
with the Samsung I2S driver.
config SOUND_RT5677
bool "Support Realtek RT5677 audio codec"
depends on SOUND
help
Enable the Realtek RT5677 audio codec. This is an I2S device used on
some Chromebooks from around 2015 ('auron'). It is configured using
an I2C interface and supports multiple sound inputs and outputs,
including digital microphones.
config SOUND_SANDBOX
bool "Support sandbox emulated audio codec"
depends on SANDBOX && SOUND
help
U-Boot sandbox can emulate a sound device using SDL, playing the
sound on the host machine. This option implements the sound_init()
and sound_play() functions for sandbox. Note that you must install
the SDL libraries for this to work.
config SOUND_WM8994
bool "Support Wolfson Micro wm8994 audio codec"
depends on I2S_SAMSUNG
help
Enable the wm8994 audio codec. This is connected via I2S for
audio data and I2C for codec control. At present it only works
with the Samsung I2S driver.
endmenu
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