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

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Date:   Wed, 4 Apr 2018 19:33:13 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Felipe Balbi <felipe.balbi@...ux.intel.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

Hi Arnd,

2018-04-04 17:43 GMT+09:00 Arnd Bergmann <arnd@...db.de>:
> 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


Very useful information!

Not tested yet, but I quickly reviewed the series visually,
and probably this will work for us.

Thanks!


-- 
Best Regards
Masahiro Yamada