linux-kernel - Re: Multiple generic PHY instances for DWC3 USB IP

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Date:   Wed, 4 Apr 2018 10:43:27 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        linux-usb@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        DTML <devicetree@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: Re: Multiple generic PHY instances for DWC3 USB IP

On Wed, Apr 4, 2018 at 10:00 AM, Felipe Balbi
<felipe.balbi@...ux.intel.com> wrote:
>
> Hi,
>
> Masahiro Yamada <yamada.masahiro@...ionext.com> writes:
>>>> Each DWC3 instance is connected with
>>>> multiple HS PHYs and multiple SS PHYs,
>>>> depending on the number of ports.
>>>
>>> in that case, you shouldn't need dwc3 at all. A Host-only dwc3 is xHCI
>>> compliant. If you really don't have the gadget block, there's no need
>>> for you to use dwc3. Just use xhci-plat directly.
>>
>> Sorry, I was misunderstanding.
>>
>> Some of our SoCs support gadget,
>> so we need to use the dwc3 driver.
>
> fair enough. Now we need to figure out how to pass multiply PHYs to a
> multi-port dwc3 instance.
>
> Kishon, any ideas? How do you think DT should look like?

See this series from Martin Blumenstingl:

https://www.spinics.net/lists/linux-usb/msg166281.html

      Arnd