Re: [PATCH 4/6] arm64: dts: qcom: kaanapali-mtp: Enable bluetooth and Wifi

[Zijun Hu]

On 3/30/2026 7:53 PM, Dmitry Baryshkov wrote:
>>> - Is the pin defined in the schema?
>> schema define property 'swctrl-gpios' with description
>> "GPIO line indicating the state of the clock supply to the BT module"
>>
>>> - Is the pin wired in the hardware?
>> pin SW_CTRL is wired in hardware.
> Granted your three answers, it can and should be described in the DT.
> 
>> i have below confusions about 'swctrl-gpios' of 'qcom,wcn7850-pmu'
>> which WCN7850 pin is 'swctrl-gpios' mean for ?
>> Why to introduce 'swctrl-gpios' ?
>> what problem does it solve ?
>> how to solve the problem ?
> Please descibe the hardware in the DT. Problem solving belongs to the
> driver.

sorry for not agreeing with your points here.

it is better to correct or remove 'swctrl-gpios' within DT binding spec at least
for 'qcom,wcn7850-pmu' with below reasons:

1) provided that 'swctrl-gpios' is for pin SW_CTRL of datasheet, binding spec's
   both description and its expected usage are wrong.
2) its driver does not parse and use the property 'swctrl-gpios', moreover, the
   property have no user within upstream DT tree.
3) the property is not mandatory based on binding spec.
4) upstream DT tree have had many such usages as mine which just set default pin
   configuration and not specify 'swctrl-gpios' explicitly.
5) kaanapali-mtp is originally preinstalled with android OS which supports some
   qualcomm specific feature which have not been supported by up-stream kernel.
   so kaanapali-mtp H/W has some wired pins which is not used by up-stream 
   kernel sometimes