Am Donnerstag, den 03.05.2018, 08:35 +0000 schrieb Jun Li:
> Hi
> > -----Original Message-----
> > From: Oliver Neukum [mailto:oneu...@suse.com]
> > Sent: 2018年5月3日 15:27
> > To: Jun Li <jun...@nxp.com>; robh...@kernel.org;
> > heikki.kroge...@linux.intel.com; gre...@linuxfoundation.org;
> > li...@roeck-us.net
> > Cc: gso...@gmail.com; dl-linux-imx <linux-...@nxp.com>; Peter Chen
> > <peter.c...@nxp.com>; shufan_...@richtek.com; a.ha...@samsung.com;
> > cw00.c...@samsung.com; devicet...@vger.kernel.org;
> > linux-usb@vger.kernel.org
> > Subject: Re: [PATCH v5 01/14] dt-bindings: connector: add properties for
> > typec
> >
> > Am Donnerstag, den 03.05.2018, 08:24 +0800 schrieb Li Jun:
> > > +Optional properties for usb-c-connector:
> > > +- power-role: should be one of "source", "sink" or "dual"(DRP) if
> > > +typec
> > > + connector has power support.
> > > +- try-power-role: preferred power role if "dual"(DRP) can support
> > > +Try.SNK
> > > + or Try.SRC, should be "sink" for Try.SNK or "source" for Try.SRC.
> > > +- data-role: should be one of "host", "device", "dual"(DRD) if typec
> > > + connector supports USB data.
> >
> > Hi,
> >
> > is this really correct?
> >
> > Can one implement a device that can operate as either DFP or UFP, but not
> > implements the dynamic role switch that a DRP must support?
>
> You mean a port with DRD on data but not DRP on power?
>
> The data-role is newly added as the data role is not coupled with power
No, I meant data role. As far as I can tell for a DRP you need to
implement the detection logic described in chapter 4 of the spec.
I can see no reason why you couldn't build a port that can be switched
between the data roles but not implement that logic.
Regards
Oliver
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