Hi Adam, On Tue, Apr 12, 2022 at 10:58:03AM -0500, Adam Ford wrote: > On Tue, Apr 12, 2022 at 10:37 AM Jun Li <lijun.kernel@xxxxxxxxx> wrote: > > > > Adam Ford <aford173@xxxxxxxxx> 于2022年4月12日周二 08:24写道： > > > > > > I have a board with a dual role USB conttroller connected to a dual > > > role hub > > > > Could you please explain more about what's "a dual role hub"? > Thanks for responding. > > > The datasheet is listed here: > https://ww1.microchip.com/downloads/en/DeviceDoc/00002238D.pdf > > I worded that poorly, sorry. It supports DCP, CDP, SDP. > > >From the datasheet: > • USB Hub Feature Controller IC Hub with:- 1 USB 3.1 Gen 1 USB > Type-CTM downstream port- 4 USB 3.1 Gen 1 legacy downstream ports- 1 > USB 2.0 downstream port- Legacy upstream port > • USB-IF Battery Charger revision 1.2 support on up & downstream ports > (DCP, CDP, SDP) > > The hope was to have the PTN enable the SRC_EN when the USB-C cable is > connected to the hub. > > > > > > connected to a PTN5110 for enabing power to the USB-C. > > > > > > SoC -> Hub -> PTN-> USB-C > > > > What signals of Hub chip connect to PTN5110 chip? > > Technically, only the CC pins are connected between the USB-C > connector and the PTN5110. There isn't really a connection to the hub > itself, but the output on the PTN enables a regulator which powers the > USB-C which does connect to the hub. > > > > > > > > > The hope was the PTN5110 would enable/disable the src_en pin when I > > > connect a device that needs power. Unfortunately, most of the > > > examples I can see for the device trees on a PTN5110 show some sort of > > > connection to a USB controller, but I am going through a hub, not a > > > controller. > > > > > > Is it possible to configure the PTN5110 to either not require > > > connection to a USB controller or plumb it to a USB hub? > > > > My understanding PTN5110(TCPCI controller with PD PHY) is independent > > with USB data path, for USB data path, I think it should be: > > SoC -> Hub -> USB-C > > PTN5110 should not care or know if there is a Hub between type-C connector > > and USB controller. > > If the type-C connector connects to a Hub, then it's a DFP only on data, > > and from power point view, you also only power source role, right? > > Yes. We're basically trying to source power when a device is > connected and power down the regulator when the USB-C device is > disconnected. Unfortunately, the PTN5110 never enables power even when > I specify it's source only with no sink. The driver acts like it > needs some sort of USB node, and when it doesn't find one, and the > example device tree in the YAML file shows a refernce to the USB > controller. I assumed I needed to plumb it to the hub somehow. If I > am reading your response correctly, I should just add the node for the > USB controller and forget the hub exists, is that correct? Which driver are you talking about? thanks, -- heikki
