linux-kernel - Re: [PATCH v4 1/2] arm64: dts: qcom: qcs8300: add display dt nodes for MDSS, DPU, DisplayPort and eDP PHY

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Message-ID: <a4b2a06c-31c5-427c-a618-1f1c3704781f@oss.qualcomm.com>
Date: Mon, 4 Aug 2025 14:34:56 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Yongxing Mou <quic_yongmou@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] arm64: dts: qcom: qcs8300: add display dt nodes
 for MDSS, DPU, DisplayPort and eDP PHY

On 8/4/25 6:39 AM, Yongxing Mou wrote:
> 
> 
> On 2025/7/30 18:25, Konrad Dybcio wrote:
>> On 7/30/25 11:49 AM, Yongxing Mou wrote:
>>> Add devicetree changes to enable MDSS display-subsystem,
>>> display-controller(DPU), DisplayPort controller and eDP PHY for
>>> Qualcomm QCS8300 platform.
>>>
>>> Signed-off-by: Yongxing Mou <quic_yongmou@...cinc.com>
>>> ---
>>
>> [...]
>>
>>> +
>>> +                assigned-clocks = <&dispcc MDSS_DISP_CC_MDSS_VSYNC_CLK>;
>>> +                assigned-clock-rates = <19200000>;
>>
>> is this necessary?
>>
> Emm, i try to remove assigned-clocks and assigned-clock-rates here, device can still work.. here we just want to keep consistent with sa8775p.

Dmitry, do you remember whether this is some relic of the past that
was required at one point?

The driver lists 19.2 as the only possible frequency for the source
of this branch

Konrad