Subject: Re: [PATCH 1/3] dt-bindings: soc: realtek: Add Realtek DHC I/O level detector

From: Krzysztof Kozlowski <[email-masked]>
Date: Thu, 4 Jun 2026 14:49:19 +0200

On 04/06/2026 13:18, Yu-Chun Lin wrote:
> From: Tzuyi Chang <[email-masked]>
> 
> Add device tree binding documentation for the Realtek DHC I/O level
> detector.
> 
> This hardware block is responsible for detecting the I/O signaling
> levels (e.g., 1.8V or 3.3V) of various interfaces (RGMII, SDIO, eMMC,
> etc.) and applying the corresponding pad configurations via pinctrl
> states.
> 
> Signed-off-by: Tzuyi Chang <[email-masked]>
> Signed-off-by: Yu-Chun Lin <[email-masked]>
> ---
>  .../realtek/realtek,rtd1625-io-detect.yaml    | 77 +++++++++++++++++++
>  1 file changed, 77 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/realtek/realtek,rtd1625-io-detect.yaml
> 
> diff --git a/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1625-io-detect.yaml b/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1625-io-detect.yaml
> new file mode 100644
> index 000000000000..badf27212dfd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1625-io-detect.yaml
> @@ -0,0 +1,77 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2026 Realtek Semiconductor Corporation
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/realtek/realtek,rtd1625-io-detect.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Realtek DHC I/O Level Detector
> +
> +maintainers:
> +  - Tzuyi Chang <[email-masked]>
> +
> +description: |

Drop |

> +  The Realtek DHC I/O Level Detector is a hardware block that detects I/O
> +  signaling levels (such as 1.8V or 3.3V) to determine the correct pad
> +  configurations for specific IP blocks.
> +
> +properties:
> +  compatible:
> +    const: realtek,rtd1625-io-detect
> +

No resources here, so does not look like a real device, but driver
instantiation.

> +  pinctrl-names:
> +    items:
> +      - const: rgmii_1v8
> +      - const: rgmii_3v3
> +      - const: sdio_1v8
> +      - const: sdio_3v3
> +      - const: csi_1v8
> +      - const: csi_3v3
> +      - const: sd_1v8
> +      - const: sd_3v3
> +      - const: uart1_1v8
> +      - const: uart1_3v3
> +      - const: aio_1v8
> +      - const: aio_3v3
> +      - const: emmc_1v8
> +      - const: emmc_3v3
> +
> +  realtek,iso-pinctrl:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Pinctrl phandle containing I/O detection registers.

MMIO registers are in 'reg' property.

> +
> +required:
> +  - compatible
> +  - pinctrl-names
> +  - realtek,iso-pinctrl
Best regards,
Krzysztof