linux-kernel - Re: [PATCH] dt-bindings: display: msm: dsi: remove address/size cells

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Date:   Mon, 28 Mar 2022 19:17:55 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Krishna Manikandan <mkrishn@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: display: msm: dsi: remove address/size cells

On 28/03/2022 19:16, Vinod Koul wrote:
> On 28-03-22, 19:43, Dmitry Baryshkov wrote:
>> On Mon, 28 Mar 2022 at 18:30, Krzysztof Kozlowski
>> <krzysztof.kozlowski@...aro.org> wrote:
>>>
>>> The DSI node is not a bus and the children do not have unit addresses.
>>>
>>> Reported-by: Vinod Koul <vkoul@...nel.org>
>>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>
>> NAK.
>> DSI panels are children of the DSI device tree node with the reg = <0>; address.
>> This is the convention used by other platforms too (see e.g.
>> arch/arm64/boot/dts/freescale/imx8mq-evk.dts).
> 
> So we should add reg = 0, i will update my dtsi fix
> 

To "ports" node? No. The reg=0 is for children of the bus, so the
panels. How to combine both without warnings - ports and panel@0 - I
don't know yet...

Best regards,
Krzysztof