Messages in this thread | | | Date | Mon, 22 Jul 2019 13:48:39 +0200 | From | "" <> | Subject | Re: [PATCH v10 0/6] Introduced new Cadence USBSS DRD Driver. |
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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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