Re: [PATCH 0/3] Configure usb0 as peripheral on am335x boards

[Julien Panis]

On 6/30/23 21:40, Roger Quadros wrote:
> Hi,
>
> On 30/06/2023 11:30, Julien Panis wrote:
> > Hello Tony,
> >
> > On 6/30/23 09:20, Tony Lindgren wrote:
> > > Hi,
> > >
> > > * Julien Panis <jpanis@xxxxxxxxxxxx> [230629 13:10]:
> > > > This series configures usb0 dr_mode as 'peripheral' for am335x-evm,
> > > > am335x-evmsk, and am335x-icev2. This USB port is mainly used for
> > > > RNDIS and DFU.
> > > Is this a mini-B connector? Just wondering if it was originally attempted
> > > to be configured as OTG or how it ended up with a host configuration..
> > It's a micro USB-AB connector.
> > I don't know how it ended up with a host configuration, it looks like an oversight.
> > Maybe Vignesh or Nishanth can confirm (?)
> usb0 role should be "otg".
> It is rightly so in Linux DT. am33xx.dtsi contains "otg" and all AM335x board files inherit from it.
>
> So I don't think setting it to "peripheral" in u-boot is the right thing to do.

This series is for kernel (not for u-boot).
Why is it a problem to set usb0 as 'peripheral' in kernel for the 3 board dts ?

With usb0 not set as 'peripheral', the 3 boards (am335x-evm, evm-sk, icev2)
do not boot with uboot 2023.04. This error is returned, with LOG_LEVEL=5:
    No USB device found
    USB ether init failed
    initcall sequence 8ffdbba4 failed at call 808024d9 (err=-19)
    ### ERROR ### Please RESET the board ###
This error is also returned with usb0 as 'otg'.

Julien Panis