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SubjectRe: [PATCH v10 0/6] Introduced new Cadence USBSS DRD Driver.
On Mon, Jul 22, 2019 at 09:58:42AM +0000, Pawel Laszczak wrote:
> 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.

debugfs is ONLY for debugging, never rely on it being enabled, or
mounted, on a system in order to have any normal operation happen.

So for testing, yes, this is fine. If this is going to be the normal
api/interface for how to control this driver, no, that is not acceptable
at all.

thanks,

greg k-h

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