On 9/2/25 8:56 AM, Yingying Tang wrote:
>
>
> On 9/2/2025 10:37 AM, Dmitry Baryshkov wrote:
>> On Mon, Sep 01, 2025 at 11:02:24AM +0800, Yingying Tang wrote:
>>>
>>>
>>> On 8/28/2025 7:18 PM, Dmitry Baryshkov wrote:
>>>> On Thu, Aug 28, 2025 at 12:48:47PM +0800, 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.
[...]
>>>>> + wcn7850-pmu {
>>>>> + compatible = "qcom,wcn7850-pmu";
>>>>> +
>>>>> + vdd-supply = <&vreg_wcn_0p95>;
>>>>> + vddio-supply = <&vreg_l15b_1p8>;
>>>>> + vddaon-supply = <&vreg_wcn_0p95>;
>>>>> + vdddig-supply = <&vreg_wcn_0p95>;
>>>>> + vddrfa1p2-supply = <&vreg_wcn_1p9>;
>>>>> + vddrfa1p8-supply = <&vreg_wcn_1p9>;
>>>>> +
>>>>> + bt-enable-gpios = <&tlmm 116 GPIO_ACTIVE_HIGH>;
>>>>
>>>> Okay, so how is WiFi controlled? Is there a GPIO? The DT should be
>>>> describing the hardware, not the UEFI behaviour.
>>>>
>>> Hi Dmitry, as I described in previous mail, On hamoa platfrom whole wifi module's power supply and enable gpio are voted in UEFI.
>>> Hamoa is PC platform, so BIOS/UEFI behavior is compatible with Windows/ACPI architecture. UEFI is responsible for enabling power supply
>>> for all devices which may be used in boot phase (such as WLAN may be used to boot from network).
>>
>> This is not completely relevant. You are describing driver / Linux /
>> bootloader behaviour. I asked if there is a GPIO in the hardware. If
>> there is one, please add it here.
>
> Hi Dimitry,
>
> During the UEFI boot phase, the WLAN enable GPIO has already been asserted, and the WLAN chip is functioning normally.
> If we include this GPIO in the kernel device tree, when the kernel configures this GPIO, its voltage level may experience a brief glitch, which could cause the WLAN chip to reset and result in a PCIe link down.
The WCN pwrseq code handles this already, please simply describe the
hardware like the platform firmware description which you're creating
is supposed to
Konrad
