FSLSSI_I2S_FORMATS(9)

hey bestie, welcome to the FSLSSI_I2S_FORMATS page from the Kernel API Manual 💅 this one is all about the audio formats the SSI can handle 🎀

✨ NAME ✨

FSLSSI_I2S_FORMATS — literally the audio formats supported by the SSI 🦋

🌸 SYNOPSIS 🌸

FSLSSI_I2S_FORMATS

💜 DESCRIPTION 💜

okay so the SSI has a limitation, and it is lowkey important: the samples must be in the same byte order as the host CPU 😭.

Why? Because when multiple bytes are written to the STX register, the bytes and the bits must be written in the same order. The STX is a shift register, so all the bits need to be aligned — meaning bit-endianness must match byte-endianness 💅. Processors typically write the bits within a byte in the same order that the bytes of a word are written in. So if the host CPU is big-endian, then only big-endian samples will be written to STX properly. periodt. 🔥

🦋 SEE ALSO 🦋

• Kernel file ./sound/soc/fsl/fsl_ssi.c
• struct fsl_ssi(9)
• fsl_ssi_isr(9)
• fsl_ssi_config_enable(9)
• fsl_ssi_config_disable(9)
• fsl_ssi_setup_regvals(9)
• fsl_ssi_set_bclk(9)
• fsl_ssi_hw_params(9)
• fsl_ssi_set_dai_fmt(9)
• fsl_ssi_set_dai_tdm_slot(9)
• fsl_ssi_trigger(9)
• fsl_ssi_hw_init(9)
• fsl_ssi_hw_clean(9)

mwah 💋 this little icon signs off from source path ./sound/soc/fsl, manual version FSLSSI_I2S_FORMATS(9), dated October 2026 🫶✨