linux-kernel - Re: [PATCH 2/3] arm64: dts: qcom: qcs8300: add Display Serial Interface device nodes

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Message-ID: <fba96ad1-9a1f-40a7-981e-3c229439802f@quicinc.com>
Date: Mon, 29 Sep 2025 12:07:58 +0530
From: Ayushi Makhija <quic_amakhija@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <robdclark@...il.com>,
        <sean@...rly.run>, <marijn.suijten@...ainline.org>,
        <andersson@...nel.org>, <robh@...nel.org>, <robh+dt@...nel.org>,
        <krzk+dt@...nel.org>, <konradybcio@...nel.org>, <conor+dt@...nel.org>,
        <andrzej.hajda@...el.com>, <neil.armstrong@...aro.org>,
        <rfoss@...nel.org>, <Laurent.pinchart@...asonboard.com>,
        <jonas@...boo.se>, <jernej.skrabec@...il.com>,
        <quic_rajeevny@...cinc.com>, <quic_vproddut@...cinc.com>,
        <quic_jesszhan@...cinc.com>
Subject: Re: [PATCH 2/3] arm64: dts: qcom: qcs8300: add Display Serial
 Interface device nodes



On 9/26/2025 7:35 PM, Dmitry Baryshkov wrote:
> On Fri, Sep 26, 2025 at 02:55:19PM +0530, Ayushi Makhija wrote:
>> On 9/26/2025 3:32 AM, Dmitry Baryshkov wrote:
>>> On Thu, Sep 25, 2025 at 11:06:01AM +0530, Ayushi Makhija wrote:
>>>> Add device tree nodes for the DSI0 controller with their corresponding
>>>> PHY found on Qualcomm QCS8300 SoC.
>>>>
>>>> Signed-off-by: Ayushi Makhija <quic_amakhija@...cinc.com>
>>>> ---
>>>>  arch/arm64/boot/dts/qcom/qcs8300.dtsi | 95 ++++++++++++++++++++++++++-
>>>>  1 file changed, 94 insertions(+), 1 deletion(-)
>>>>
>>>> +
>>>> +			mdss_dsi0_phy: phy@...4400 {
>>>> +				compatible = "qcom,sa8775p-dsi-phy-5nm";
>>>
>>> Add qcs8300-specific compatible and use sa8775p as a fallback
>>>
>>
>> Hi Dmitry,
>>
>> I have one doubt, even though the ctrl and phy versions for sa8775p(LeMans) and qcs8300(Monaco) are same.
>> Why can't we use the same compatible string that we have used for LeMans ctrl and phy ? what is the need to define a separate
>> compatible string for monaco ctrl and phy ?
> 
> Konrad responded with the reason. But also, this question should have
> been asked when you took a first look at the qcom,qcs8300-mdss.yaml.
> It has two compats for DPU, DP and eDP PHY blocks (for exactly the same
> reason).
> 

Hi Dmitry/Konard,

The previous explanation regarding the use of two compatible strings for DPU/DP was unclear, but it is now well understood. Thanks, for the clarification. 

Thanks,
Ayushi