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SubjectRe: [PATCH 7/8] dt-bindings: soc: socionext: Add UniPhier DWC3 USB glue layer
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On 30/11/2022 10:00, Kunihiko Hayashi wrote:
> Hi Krzysztof,
>
> On 2022/11/29 23:52, Krzysztof Kozlowski wrote:
>> 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@socionext.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@socionext.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@65b00000 {
>>
>> Node name: usb. There is no usage of "usb-controller".
>
> I'm confusing about that.
>
> This is an interface logic and doesn't have USB functions by itself.
> Surely there is a USB host controller node "usb@..." in the same SoC.
> Can this node be renamed to "usb"?
>
> I've renamed the dts node name once in commit 4cc752a88ca9
> ("arm64: dts: uniphier: Rename usb-glue node for USB3 to usb-controller").

In (almost?) all other cases it is still called "usb". A bit akward to
have usb in usb, but usb-controller did not stick...

>
>>> + 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?
>
> The glue layer has a fixed register address for each child unlike
> the previous patch.
>
> This layer has also the other registers for USB core outside
> the child nodes, however, there is no parent device that manages
> these registers, so this layer node itself should take care of these
> registers.
>
>> Are the children here - regulator, reset controller and phys - related
>> to the USB?
>
> Yes, this "glue layer" is an interface of the USB controller, so these
> children are only used for the USB controller.


OK

Best regards,
Krzysztof

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