Re: [PATCH v3 4/4] arm64: dts: qcom: Add base HAMOA-IOT-EVK board

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 7/29/25 11:39 AM, Yingying Tang wrote:
> 
> 
> On 7/29/2025 4:37 PM, Konrad Dybcio wrote:
>> On 7/29/25 7:51 AM, Yijie Yang wrote:
>>>
>>>
>>> On 2025-07-29 09:32, Yijie Yang wrote:
>>>> The HAMOA-IOT-EVK is an evaluation platform for IoT products, composed of
>>>> the Hamoa IoT SoM and a carrier board. Together, they form a complete
>>>> embedded system capable of booting to UART.
>>>>
>>>> This change enables and overlays the following peripherals on the carrier
>>>> board:
>>>> - UART
>>>> - On-board regulators
>>>> - USB Type-C mux
>>>> - Pinctrl
>>>> - Embedded USB (EUSB) repeaters
>>>> - NVMe
>>>> - pmic-glink
>>>> - USB DisplayPorts
>>>>
>>>> Written with contributions from Shuai Zhang (added Bluetooth) and Yongxing
>>>> Mou (added USB DisplayPorts).
>>>>
>>>> Signed-off-by: Yijie Yang <yijie.yang@oss.qualcomm.com>
>>>> ---
>>
>> [...]>> +    vreg_wcn_3p3: regulator-wcn-3p3 {
>>>> +        compatible = "regulator-fixed";
>>>> +
>>>> +        regulator-name = "VREG_WCN_3P3";
>>>> +        regulator-min-microvolt = <3300000>;
>>>> +        regulator-max-microvolt = <3300000>;
>>>> +
>>>> +        gpio = <&tlmm 214 GPIO_ACTIVE_HIGH>;
>>>> +        enable-active-high;
>>>> +
>>>> +        pinctrl-0 = <&wcn_sw_en>;
>>>> +        pinctrl-names = "default";
>>>> +
>>>> +        regulator-boot-on;
>>>
>>> It should be set to 'regulator-always-on'.
>>
>> Are you sure? Turning off Wi-Fi sounds like a valid usecase..
> 
> Hi Konard, It is m.2 interface on Hamoa. The PCIe power of m.2 should be always on.
> 
> Even on QCOM's B2B interface, we are unable to dynamically control the power of PCIe devices on upstream kernel.
> The PCIe specification does not support dynamic power control between the PCIe device and the RC.
> PCIe power should be always on here.

I see, I was confused by the name 

Konrad