Re: [PATCH 2/2] arm64: dts: qcom: qrb4210-rb2: set role-switch-default-mode

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On Thu, Jun 20, 2024 at 03:30:29PM GMT, Caleb Connolly wrote:
> 
> 
> On 20/06/2024 15:15, Dmitry Baryshkov wrote:
> > On Wed, 19 Jun 2024 at 23:33, Caleb Connolly <caleb.connolly@xxxxxxxxxx> wrote:
> > > 
> > > Give a hint to the OS which role we prefer. Host mode generally makes
> > > the most sense.
> > 
> > Why?
> 
> I guess this is subjective, but on these boards the more common usecase is
> host mode (before we had role switching we forced them to host mode...).
> > 
> > > 
> > > Signed-off-by: Caleb Connolly <caleb.connolly@xxxxxxxxxx>
> > > ---
> > >   arch/arm64/boot/dts/qcom/qrb4210-rb2.dts | 4 ++++
> > >   1 file changed, 4 insertions(+)
> > 
> > Would it make sense to set this for all the RB and HDK boards?
> 
> The rb1/2 are the only boards which lack multiple USB controllers. For
> others it's fine to leave the default (peripheral mode).

SM8450-HDK and SM8650-HDK also have just a single USB-C port. My logic
was slightly different. We consider these devices to be SBCs, so I'd
expect that they act as hosts _by_default_. If somebody plugs RB board
into a laptop, then it's logical that it should work as a device, but
between the phone and the RB board the RB is a host.

-- 
With best wishes
Dmitry




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