linux-kernel - Re: [PATCH 7/8] dt-bindings: soc: socionext: Add UniPhier DWC3 USB glue layer

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Message-ID: <12a98c77-5464-0f25-9081-13217f396484@linaro.org>
Date:   Tue, 29 Nov 2022 15:52:12 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/8] dt-bindings: soc: socionext: Add UniPhier DWC3 USB
 glue layer

On 29/11/2022 11:35, Kunihiko Hayashi wrote:
> Add DT binding schema for components belonging to the platform-specific
> DWC3 USB glue layer implemented in UniPhier SoCs.
> 
> This USB glue layer works as a sideband logic for the host controller,
> including core reset, vbus control, PHYs, and some signals to the
> controller.
> 
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> ---
>  .../socionext,uniphier-dwc3-glue.yaml         | 106 ++++++++++++++++++
>  1 file changed, 106 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/socionext/socionext,uniphier-dwc3-glue.yaml
> 
> diff --git a/Documentation/devicetree/bindings/soc/socionext/socionext,uniphier-dwc3-glue.yaml b/Documentation/devicetree/bindings/soc/socionext/socionext,uniphier-dwc3-glue.yaml
> new file mode 100644
> index 000000000000..66f8786dd305
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/socionext/socionext,uniphier-dwc3-glue.yaml
> @@ -0,0 +1,106 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/socionext/socionext,uniphier-dwc3-glue.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Socionext UniPhier SoC DWC3 USB3.0 glue layer
> +
> +maintainers:
> +  - Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> +
> +description: |+
> +  DWC3 USB3.0 glue layer implemented on Socionext UniPhier SoCs is
> +  a sideband logic handling signals to DWC3 host controller inside
> +  USB3.0 component.
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - socionext,uniphier-pro4-dwc3-glue
> +          - socionext,uniphier-pro5-dwc3-glue
> +          - socionext,uniphier-pxs2-dwc3-glue
> +          - socionext,uniphier-ld20-dwc3-glue
> +          - socionext,uniphier-pxs3-dwc3-glue
> +          - socionext,uniphier-nx1-dwc3-glue
> +      - const: simple-mfd
> +
> +  reg:
> +    maxItems: 1
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 1
> +
> +  ranges: true
> +
> +patternProperties:
> +  "^reset-controller@[0-9a-f]+$":
> +    $ref: /schemas/reset/socionext,uniphier-glue-reset.yaml#
> +
> +  "^regulator@[0-9a-f]+$":
> +    $ref: /schemas/regulator/socionext,uniphier-regulator.yaml#
> +
> +  "^phy@[0-9a-f]+$":
> +    oneOf:
> +      - $ref: /schemas/phy/socionext,uniphier-usb3hs-phy.yaml#
> +      - $ref: /schemas/phy/socionext,uniphier-usb3ss-phy.yaml#
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    usb-controller@...00000 {

Node name: usb. There is no usage of "usb-controller".

> +        compatible = "socionext,uniphier-ld20-dwc3-glue", "simple-mfd";
> +        reg = <0x65b00000 0x400>;
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        ranges = <0 0x65b00000 0x400>;
> +
> +        reset-controller@0 {
> +            compatible = "socionext,uniphier-ld20-usb3-reset";
> +            reg = <0x0 0x4>;

So now I see the unit addresses, which means none of your previous
patches needed them. This raises next question - why this device is
special and does not use syscon but own unit address?

Are the children here - regulator, reset controller and phys - related
to the USB?

Best regards,
Krzysztof