linux-kernel - RE: [PATCH v10 0/6] Introduced new Cadence USBSS DRD Driver.

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Date:   Mon, 22 Jul 2019 09:58:42 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Pavel Machek <pavel@....cz>
CC:     "felipe.balbi@...ux.intel.com" <felipe.balbi@...ux.intel.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "rogerq@...com" <rogerq@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jbergsagel@...com" <jbergsagel@...com>,
        "nsekhar@...com" <nsekhar@...com>, "nm@...com" <nm@...com>,
        Suresh Punnoose <sureshp@...ence.com>,
        Jayshri Dajiram Pawar <jpawar@...ence.com>,
        Rahul Kumar <kurahul@...ence.com>,
        Anil Joy Varughese <aniljoy@...ence.com>
Subject: RE: [PATCH v10 0/6] Introduced new Cadence USBSS DRD Driver.

Hi, 

>
>> This patch introduce new Cadence USBSS DRD driver to linux kernel.
>>
>> The Cadence USBSS DRD Controller is a highly configurable IP Core which
>> can be instantiated as Dual-Role Device (DRD), Peripheral Only and
>> Host Only (XHCI)configurations.
>
>I see you are using debugfs to select between DRD, peripheral-onlyh and XHCI...
>
>Is that good idea?

Yes driver allows selecting dr_mode by debugfs. Controller also support such functionality 
so I don't understand why would it not be a good idea. 

I personally use this for testing but it can be used to limit controller functionality without 
recompiling kernel. 

>This is at least 3rd driver needing that capability, and debugfs does not
>sound like a good match.
>

Pawell