Audio codecs hardware components

1 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.

2 Software frameworks

Internal peripherals software table template

| 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
|-
|}

3 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.

3.1 Linux driver

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

Sources:

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

4 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.

4.1 Linux driver

Bindings: Documentation/devicetree/bindings/sound/cs42l51.txt (v4.20)

Sources: sound/soc/codecs/cs42l51.c

5 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.

5.1 Linux driver

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

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

6 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

6.1 Linux driver

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

Sources: sound/soc/codecs/dmic.c

Warning

cs42l51 bindings linked forced to 4.20. Version to be removed on next kernel rebase