Re: [PATCH 10/10] ARM: dts: qcom: apq8074-dragonboard: enable the USB3 host

[Konrad Dybcio]

On 8/10/26 1:42 PM, Dmitry Baryshkov wrote:
> The USB3 port of the dragonboard drives the onboard TUSB8040A hub with
> the AX88179 GbE controller and the PL2775 USB-SATA bridge behind it,
> but the controller is disabled and nothing describes the devices, so
> their reset lines float and their supplies are unmanaged.
> 
> Enable the DWC3 controller in host mode together with both of its
> PHYs, and describe the onboard chain as device nodes under the
> controller: the TUSB8040A hub pair (with the EEPROM-programmed
> 0451:8041/0451:8043 IDs this board reports), the AX88179 on the DN2
> port and the PL2775 on the DN0 port, each with its PM8941 reset GPIO,
> all powered from the always-on 3.3V carrier board rail, modeled as a
> fixed regulator.
> 
> The SuperSpeed PHY is required even for the hub's USB 2.0 half to
> respond: with the SS PHY left uninitialized the hub connects but never
> answers enumeration at any speed.
> 
> Assisted-by: Claude:claude-fable-5
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>

Konrad