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

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Message-ID: <5irzdmwxs2j4ppti35hc5235yxqq576doerrrk6fhcpj7f726a@eh5rl2jwb5kg>
Date: Fri, 26 Sep 2025 17:05:41 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Ayushi Makhija <quic_amakhija@...cinc.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 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).

-- 
With best wishes
Dmitry