Re: [PATCH v5 1/9] dt-bindings: soc: qcom: eud: Add per-path child nodes for UTMI routing

On Fri, Aug 07, 2026 at 09:20:26AM +0200, Krzysztof Kozlowski wrote:
> On Sun, Aug 02, 2026 at 08:15:26PM -0700, Elson Serrao wrote:
> > The Qualcomm Embedded USB Debugger (EUD) can intercept one or two
> > High-Speed UTMI paths depending on the SoC. For example, SC7280 supports
> > EUD on the primary UTMI path only, while SM8350 supports EUD on both
> > primary and secondary UTMI paths.
> > 
> > Each UTMI path connects an independent USB controller/connector pair and
> > forms its own role-switch domain. EUD routes traffic based on USB role.
> > In device role the debug hub is inserted, while in host role it is
> > bypassed.
> > 
> > The existing binding models EUD using a flattened ports representation.
> > While sufficient for fixed device-role configurations, it cannot naturally
> > associate a controller, connector, and role switch with a specific
> > EUD-routable path. This is problematic for role-switch capable ports and
> > becomes more pronounced on SoCs with multiple paths. In such cases, each
> > path forms an independent role-switch domain and requires per-path role
> > awareness.
> > 
> > Model each UTMI path as a separate child node with its own OF graph. Add
> > an SM8350 compatible for dual-path EUD topologies while retaining the
> > legacy ports representation for backward compatibility.
> > 
> > Signed-off-by: Elson Serrao <[email protected]>
> > ---
> >  .../bindings/soc/qcom/qcom,eud.yaml           | 128 +++++++++++++++++-
> >  1 file changed, 127 insertions(+), 1 deletion(-)
> 
> Reviewed-by: Krzysztof Kozlowski <[email protected]>

sashiko correctly points out the oneOf logic is flawed.