RE: [PATCH v3 15/15] ARM: dts: rza2mevb: Add USB host support

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Geert,

On Wed, May 15, 2019 1, Geert Uytterhoeven wrote:
> > > Does resistor R78 need to be mounted, too?
> >
> > By default, R78 and R79 are not populated on these boards, and both Host
> > and Function work fine without board modification, so I would say
> > populating R78 is not a requirement as far as I can tell.
> 
> I asked because after reading Section 2.4 USB Interface in the RZ/A2M CPU
> Board  User's Manual, it's not clear to me when one needs to
> populate one of these resistors. Especially in relation to JP3, which
> talks about 2 possible modes (host vs. function), while the resistor
> paragraph talks about 3 possible modes (dual-role vs. host vs.
> function).

Honestly, I'm not sure what they were thinking.
They put on a USB-C connector, and put on circuitry to detect if a Host 
or device was attached....but then put a physical jumper on the board to
connect/disconnect VBUS power.


> Perhaps I just need to drink more USB Kool-Aid?
> (no Kool-Aid sold in local shops, though; we live on Coke ;-)

Maybe not Kool-Aid as it seem they were 'smoking something' instead. :o


Chris




[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux