Existing i.MX audio sound card described by this binding use codecs
that operate in i2s or dsp_b formats. The newly added CS42448 codec
requires dsp_a for its TDM interface. To properly describe such
hardware in DT, the binding needs to allow dsp_a DAI format.

Only i2s, dsp_b and dsp_a are included because these are the formats
actually used by the hardware supported by this binding. Other formats
such as left_j, right_j, ac97 are not used or required by the hardware
currently covered by this binding, so they are intentionally not added.

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
---
Changes in v3:
- Rewrote commit message completely to describe hardware requirements.
Explicitly documented why only dsp_a is added and why other formats
are not included.
- Rebased on latest code base. No functional changes.

Changes in v2:
- Updated commit message to explain current support for i2s and dsp_b
formats and new support for dsp_a. No code changes.

 Documentation/devicetree/bindings/sound/imx-audio-card.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/sound/imx-audio-card.yaml b/Documentation/devicetree/bindings/sound/imx-audio-card.yaml
index 5424d4f16f52..75757fbccd89 100644
--- a/Documentation/devicetree/bindings/sound/imx-audio-card.yaml
+++ b/Documentation/devicetree/bindings/sound/imx-audio-card.yaml
@@ -37,6 +37,7 @@ patternProperties:
         items:
           enum:
             - i2s
+            - dsp_a
             - dsp_b

       dai-tdm-slot-num: true
--
2.50.1

On Fri, Mar 27, 2026 at 11:15 AM Chancel Liu <chancel.liu@nxp.com> wrote:
>
> Existing i.MX audio sound card described by this binding use codecs
> that operate in i2s or dsp_b formats. The newly added CS42448 codec
> requires dsp_a for its TDM interface. To properly describe such
> hardware in DT, the binding needs to allow dsp_a DAI format.
>
> Only i2s, dsp_b and dsp_a are included because these are the formats
> actually used by the hardware supported by this binding. Other formats
> such as left_j, right_j, ac97 are not used or required by the hardware

"pdm", "left_j", "right_j" are supported by SAI, so I think they should be added
from the hardware point of view.

Best regards
Shengjiu Wang


Shengjiu Wang

> currently covered by this binding, so they are intentionally not added.
>
> Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
> ---
> Changes in v3:
> - Rewrote commit message completely to describe hardware requirements.
> Explicitly documented why only dsp_a is added and why other formats
> are not included.
> - Rebased on latest code base. No functional changes.
>
> Changes in v2:
> - Updated commit message to explain current support for i2s and dsp_b
> formats and new support for dsp_a. No code changes.
>
>  Documentation/devicetree/bindings/sound/imx-audio-card.yaml | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/Documentation/devicetree/bindings/sound/imx-audio-card.yaml b/Documentation/devicetree/bindings/sound/imx-audio-card.yaml
> index 5424d4f16f52..75757fbccd89 100644
> --- a/Documentation/devicetree/bindings/sound/imx-audio-card.yaml
> +++ b/Documentation/devicetree/bindings/sound/imx-audio-card.yaml
> @@ -37,6 +37,7 @@ patternProperties:
>          items:
>            enum:
>              - i2s
> +            - dsp_a
>              - dsp_b
>
>        dai-tdm-slot-num: true
> --
> 2.50.1
>