linux-kernel - Re: [PATCH v1 1/2] dt-binding: usb: ci-hdrc-usb2: document Nuvoton NPCM supprt

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Date:   Tue, 19 Sep 2023 16:31:56 +0300
From:   Tomer Maimon <tmaimon77@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     peter.chen@...nel.org, gregkh@...uxfoundation.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        xu.yang_2@....com, peng.fan@....com, avifishman70@...il.com,
        tali.perry1@...il.com, joel@....id.au, venture@...gle.com,
        yuenn@...gle.com, benjaminfair@...gle.com, j.neuschaefer@....net,
        openbmc@...ts.ozlabs.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v1 1/2] dt-binding: usb: ci-hdrc-usb2: document Nuvoton
 NPCM supprt

On Tue, 19 Sept 2023 at 15:39, Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 19/09/2023 07:14, Tomer Maimon wrote:
> >>>            - nvidia,tegra20-ehci
> >>>            - nvidia,tegra20-udc
> >>>            - nvidia,tegra30-ehci
> >>> @@ -325,6 +326,20 @@ properties:
> >>>      type: boolean
> >>>      deprecated: true
> >>>
> >>> +  nuvoton,sysgcr:
> >>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> >>> +    items:
> >>> +      - items:
> >>> +          - description: phandle to syscon that configures usb phy mux.
> >>> +          - description: offset of usb phy mux selection.
> >>> +          - description: mask usb phy mux selection.
> >>> +          - description: value usb phy mux selection.
> >>> +    description:
> >>> +      A phandle to syscon with three arguments that configure usb phy mux.
> >>> +      The argument one is the offset of usb phy mux selection, the argument two
> >>> +      is the mask usb phy mux selection, the argument three is the mask usb phy
> >>> +      mux selection.
> >>
> >> Sorry, you miss phy driver. Don't use syscon instead of proper hardware
> >> devices.
> > Sorry the role of nuvoton,sysgcr property is to handle a mux between
> > the different devices and not the handle the phy itself, handle the
> > mux done in the GCR.
> > Should we move the nuvoton,sysgcr description to another place in the
> > ci-hdrc-usb2.yaml
> > or
> > Should we use a different driver to handle the mux and call it from
> > the ci-hdrc-npcm driver, If yes which driver should we use?
>
> What is an "usb phy mux"?
We have USB phy that could be connected to USB host (different driver)
or it can be connected to the UDC driver(ChipIdea)
> Best regards,
> Krzysztof
>

Best regards,

Tomer