Re: [PATCH v1 3/6] dt-bindings: display: tegra: Document 8-bit CPU parallel interface

[Thierry Reding]

On Wed, Sep 30, 2026 at 10:05:32AM +0300, Svyatoslav Ryhel wrote:
> Document 8-bit CPU parallel MIPI DBI Type B interface provided by
> Tegra20/30 SoCs display controller.
> 
> Signed-off-by: Svyatoslav Ryhel <clamor95@xxxxxxxxx>
> ---
>  .../display/tegra/nvidia,tegra-8bit-cpu.yaml  | 138 ++++++++++++++++++
>  1 file changed, 138 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/tegra/nvidia,tegra-8bit-cpu.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra-8bit-cpu.yaml b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra-8bit-cpu.yaml
> new file mode 100644
> index 0000000000000..f0dab608b2936
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra-8bit-cpu.yaml
> @@ -0,0 +1,138 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/tegra/nvidia,tegra-8bit-cpu.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Nvidia Tegra DC based MIPI DBI Type B bridge
> +
> +maintainers:
> +  - Svyatoslav Ryhel <clamor95@xxxxxxxxx>
> +
> +description: The display controller in Tegra20/30 SoCs features an
> +  8-bit SPI interface that closely resembles the MIPI DBI Type B
> +  protocol and is referred to as '8-bit CPU'. Each display controller
> +  provides two such interfaces, which can be used to send MIPI DCS
> +  commands to initialize and control the panel while image data is
> +  transmitted via 16/18/24-line RGB.
> +
> +properties:
> +  compatible:
> +    const: nvidia,tegra-8bit-cpu

The description says that this is a feature of the display controller,
so adding a new binding and compatible string for this is not the right
move. This is all covered by the "nvidia,tegra{20,30}-dc" already, just
need to extend that with whatever is new.

Thierry

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