Audio codecs hardware components

Article purpose

The purpose of this article is to:

• list the audio codec hardware components that might be integrated in the different STM32MPU boards
• link these components to the corresponding software framework(s)
• point to the datasheet(s) of these components
• explain, when necessary, how to configure these components.

Software frameworks

Domain	Peripheral	Software frameworks			Comment
		Cortex-A7 secure (OP-TEE)	Cortex-A7 non-secure (Linux)	Cortex-M4 (STM32Cube)
Audio	Wolfson wm8994		ALSA framework		DAC & ADC audio codec
Audio	Cirrus cs42l51		ALSA framework		DAC & ADC audio codec
Audio	Silab sil9022		ALSA framework		HDMI transmitter
Audio	ST MP34DT01-M		ALSA framework		Digital microphone

Wolfson wm8994

The WM8994 is a highly integrated ultra-low power hi-fi CODEC rich in multimedia features.

For details and the datasheet please contact the WM8994 codec provider.

Linux driver

Bindings: Documentation/devicetree/bindings/sound/wm8994.txt| |}} Documentation/devicetree/bindings/sound/wm8994.txt

Sources:

• drivers/mfd/wm8994-core.c| |}} drivers/mfd/wm8994-core.c
• sound/soc/codecs/wm8994.c| |}} sound/soc/codecs/wm8994.c
• sound/soc/codecs/wm_hubs.c| |}} sound/soc/codecs/wm_hubs.c

Cirrus cs42l51

The CS42L51 is a highly integrated, 24-bit, low-power stereo CODEC.

For details and the datasheet please contact the CS42L51 codec provider.

Linux driver

Bindings: Documentation/devicetree/bindings/sound/cs42l51.txt| |}} Documentation/devicetree/bindings/sound/cs42l51.txt

Sources: sound/soc/codecs/cs42l51.c| |}} sound/soc/codecs/cs42l51.c

Silab sil9022

The SiI9022A HDMI transmitter supports the HDMI^® Specification on a wide range of mobile products.

For details and the datasheet please contact the SiI9022A HDMI transmitter provider.

Linux driver

Bindings: Documentation/devicetree/bindings/display/bridge/sii902x.txt| |}} Documentation/devicetree/bindings/display/bridge/sii902x.txt

Sources: drivers/gpu/drm/bridge/sii902x.c| |}} drivers/gpu/drm/bridge/sii902x.c

ST MP34DT01-M

The MP34DT01-M is an ultra-compact, low-power, omnidirectional, digital MEMS microphone.

Datasheet: https://www.st.com/resource/en/datasheet/mp34dt01-m.pdf

Linux driver

Bindings: Documentation/devicetree/bindings/sound/dmic.txt| |}} Documentation/devicetree/bindings/sound/dmic.txt

Sources: sound/soc/codecs/dmic.c| |}} sound/soc/codecs/dmic.c