Am Donnerstag, den 03.05.2018, 08:35 +0000 schrieb Jun Li: > Hi > > -----Original Message----- > > From: Oliver Neukum [mailto:oneukum@xxxxxxxx] > > Sent: 2018年5月3日 15:27 > > To: Jun Li <jun.li@xxxxxxx>; robh+dt@xxxxxxxxxx; > > heikki.krogerus@xxxxxxxxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; > > linux@xxxxxxxxxxxx > > Cc: gsomlo@xxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>; Peter Chen > > <peter.chen@xxxxxxx>; shufan_lee@xxxxxxxxxxx; a.hajda@xxxxxxxxxxx; > > cw00.choi@xxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; > > linux-usb@xxxxxxxxxxxxxxx > > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
