On 09/21/2016 10:19 AM, Icenowy Zheng wrote:
21.09.2016, 15:10, "Hans de Goede" <hdego...@redhat.com>:
On 09/21/2016 10:04 AM, Icenowy Zheng wrote:
On some newer Allwinner SoCs (H3 or A64), the PHY0 can be either routed to
the MUSB controller (which is an OTG controller) or the OHCI/EHCI pair
(which is a Host-only controller, but more stable and easy to implement).
This property marks whether on a certain board which controller should be
attached to the PHY.
Signed-off-by: Icenowy Zheng <icen...@aosc.xyz>
Erm, I think that the idea here is to dynamically switch the routing
based on the id-pin of the otg connector. IOW use the musb controller
for device mode, and the ehci/ohci proper for proper host support
when in host mode.
At least on some boards this implementation works...
(I mean Pine64, which has two USB-A connectors)
Right and I think it is great that you're working on this.
But even with an A connector on the board, we can still use the device
mode (e.g. the SoC's native FEL mode will be used this way).
Notice that you can fake id-pin changes by echoing a mode to:
Valid values to echo are: host, peripheral and otg.
If you combine this with using either an USB A<->A cable, or using
the port normally as a host you should be able to develop and test
full otg support.
Eventually we will need a full otg support rather then your current solution
and I'm afraid that your solution may get in the way of full otg support.