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

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Date:   Wed, 04 Apr 2018 11:00:54 +0300
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Kishon Vijay Abraham I <kishon@...com>
Cc:     linux-usb@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>, 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>
Subject: Re: Multiple generic PHY instances for DWC3 USB IP


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?

-- 
balbi