linux-kernel - Re: [PATCH 4/5] arm64: dts: qcom: Add support for ECS LIVA QC710

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Message-ID: <fcc6544f-b0dd-4f23-ade7-4d6f8b6a612f@oss.qualcomm.com>
Date: Tue, 13 Jan 2026 09:30:39 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Val Packett <val@...kett.cool>, cros-qcom-dts-watchers@...omium.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] arm64: dts: qcom: Add support for ECS LIVA QC710

On 1/13/26 2:31 AM, Dmitry Baryshkov wrote:
> On Mon, Jan 12, 2026 at 11:50:25AM +0100, Konrad Dybcio wrote:
>> On 1/12/26 1:31 AM, Val Packett wrote:
>>> [resent for the lists as plaintext, oops]
>>>
>>> On 1/11/26 1:50 PM, Dmitry Baryshkov wrote:
>>>
>>>> On Sun, Jan 11, 2026 at 05:35:12AM -0300, Val Packett wrote:
>>>>> Add a device tree for the ECS LIVA QC710 (Snapdragon 7c) mini PC/devkit.
>>>>> [..]
>>>>> +&dpu_intf1_out {
>>>>> +    /delete-property/ remote-endpoint;
>>>> Why? It should not be necessary.
>>>
>>> It seemed to be implicated in annoying EPROBE_DEFER issues.. But you're right, it wasn't this after all.
>>>
>>>>> +
>>>>> +&pm6150_pon {
>>>>> +    status = "disabled";
>>>> Do you know, how is Power-On routed?
>>> I think it's handled by the EC. Keeping this enabled doesn't make power-off work, and doesn't make the power button deliver events either.
>>>>> +};
>>
>> FYI I don't think a modern QC SoC can turn on without PON
>>
>> What do you mean by "doesn't make power-off work"?
> 
> It is basically a laptop SoM in the embedded case, so it has EC and PoN
> generated via the EC.

I got that part, but this doesn't answer my question. Val mentioned that
separately from the power button not generating keypress events.

Konrad