Re: [PATCH v1] arm64: dts: qcom: hamoa-iot-evk: support Bluetooth over both USB and UART

[Konrad Dybcio]

On 3/13/26 7:37 AM, Shuai Zhang wrote:
> Hi Konrad
> 
> On 3/11/2026 9:07 PM, Konrad Dybcio wrote:
>> On 3/11/26 10:09 AM, Shuai Zhang wrote:
>>> When Bluetooth supports both USB and UART, the BT UART driver is
>>> always loaded, while USB is hot-pluggable. As a result, when Bluetooth
>>> is used over USB, the UART driver still be probed and drive BT_EN low,
>>> which causes the Bluetooth device on USB to be disconnected.
>> Is bluetooth connected over UART *and* USB simultaneously?
> BT uses either UART or USB, never both at the same time.

[...]

>>>   -    wcn_bt_en: wcn-bt-en-state {
>>> -        pins = "gpio116";
>>> -        function = "gpio";
>>> -        drive-strength = <2>;
>>> -        bias-disable;
>>> +    wcn_bt_en_hog: wcn-bt-en-state-hog {
>> This name is illegal (make CHECK_DTBS=1 qcom/hamoa-iot-evk.dtb)
> 
> 
> |I will use tlmm to control|
> 
> 
>>
>>> +        gpio-hog;
>>> +        gpios = <116 GPIO_ACTIVE_HIGH>;
>>> +        output-high;
>>> +        input-disable;
>> This property is not allowed for TLMM pins
>>
>>> +        link-name = "BT_EN";
>> This property doesn't exist
> 
> 
> I  will remove it;

Please run

make [...] CHECK_DTBS=1 qcom/hamoa-iot-evk.dtb

for your next submission to ensure the schema checks succeed

Konrad