linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: Add X1E001DE Snapdragon Devkit for Windows

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Message-ID: <b1d982c1-f800-97eb-1be3-e77e04a8e81d@quicinc.com>
Date: Sun, 6 Oct 2024 00:33:21 +0530
From: Sibi Sankar <quic_sibis@...cinc.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>
CC: Bjorn Andersson <andersson@...nel.org>, <konradybcio@...nel.org>,
        <krzk+dt@...nel.org>, <robh+dt@...nel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <conor+dt@...nel.org>,
        <abel.vesa@...aro.org>, <srinivas.kandagatla@...aro.org>
Subject: Re: [PATCH 2/2] arm64: dts: qcom: Add X1E001DE Snapdragon Devkit for
 Windows



On 10/1/24 14:21, Manivannan Sadhasivam wrote:
> On Tue, Oct 01, 2024 at 09:56:30AM +0300, Dmitry Baryshkov wrote:
>> On October 1, 2024 5:42:35 AM GMT+03:00, Bjorn Andersson <andersson@...nel.org> wrote:
>>> On Wed, Sep 11, 2024 at 10:55:05AM GMT, Dmitry Baryshkov wrote:
>>>> On Wed, Sep 11, 2024 at 01:03:37PM GMT, Sibi Sankar wrote:
>>> [..]
>>>>> diff --git a/arch/arm64/boot/dts/qcom/x1e001de-devkit.dts b/arch/arm64/boot/dts/qcom/x1e001de-devkit.dts
>>> [..]
>>>>> +
>>>>> +&pcie5 {
>>>>> +	perst-gpios = <&tlmm 149 GPIO_ACTIVE_LOW>;
>>>>> +	wake-gpios = <&tlmm 151 GPIO_ACTIVE_LOW>;
>>>>> +
>>>>> +	vddpe-3v3-supply = <&vreg_wwan>;
>>>>
>>>> Please use pwrseq instead.
>>>>
>>>
>>> What benefit is there to wrap a single 3.3V regulator in pwrseq driver?
>>
>> First of all, is it really just a 3.3V? Second, is it actually powering up the host controller (as expressed in the device tree? Is it a power supply to the slot (in this case, I think, it should be expressed differently)? Or is it a power supply to the card itself?
>>
> 
> Yeah, we should get into the details here. We were not paying attention till
> now, but with the advent of pwrseq, we should describe the power supply properly
> in DT.
> 
> Here I believe the supply is to the PCIe Mini Card connector where a modem is
> connected. In that case, 3.3v supply should be connected to 3.3Vaux of the
> connector and we should have a generic pwrseq driver for the mini cards.
> 

Hey Mani, Dmitry,

The schematics are identical to that of the X1E CRD with
the exception of the pcie daughter card having the rtl8125g
on it. Yes, the 3.3V supply is connected to the card as well.

Doesn't this mean all other x1e boards out there needs to be
updated with pwrseq as well? Anway will get that addressed in
v3.

-Sibi

> Sibi, please verify the above in schematics.
> 
> - Mani