linux-kernel - Re: [PATCH 3/3] arm64: dts: mt8183-kukui: fix dtbs

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Date:   Thu, 15 Apr 2021 10:37:59 +0200
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        matthias.bgg@...nel.org
Cc:     Hsin-Yi Wang <hsinyi@...omium.org>,
        Fabien Parent <fparent@...libre.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] arm64: dts: mt8183-kukui: fix dtbs_check warnings

Hi Matthias,

On 15/4/21 9:47, Matthias Brugger wrote:
> Hi Nicolas,
> 
> On 15/04/2021 02:29, Nicolas Boichat wrote:
>> On Wed, Apr 14, 2021 at 10:46 PM <matthias.bgg@...nel.org> wrote:
>>>
>>> From: Matthias Brugger <matthias.bgg@...il.com>
>>>
>>> The dsi children don't have any reg property,
>>
>> Confused, see below.
>>
>>> so we don't need address and
>>> size cells. This makes dtbs_check happy.
>>>
>>> CC: Hsin-Yi Wang <hsinyi@...omium.org>
>>> CC: Enric Balletbo i Serra <enric.balletbo@...labora.com>
>>> CC: Nicolas Boichat <drinkcat@...omium.org>
>>> Signed-off-by: Matthias Brugger <matthias.bgg@...il.com>
>>>
>>> ---
>>>
>>>  arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi | 3 +--
>>>  1 file changed, 1 insertion(+), 2 deletions(-)
>>>
>>> diff --git a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
>>> index ff56bcfa3370..f4dca6a33168 100644
>>> --- a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
>>> +++ b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
>>> @@ -251,8 +251,7 @@ &cpu7 {
>>>
>>>  &dsi0 {
>>>         status = "okay";
>>> -       #address-cells = <1>;
>>> -       #size-cells = <0>;
>>> +
>>>         panel: panel@0 {
>>>                 /* compatible will be set in board dts */
>>>                 reg = <0>;
>>
>> ^^ isn't that... a reg property?
>>
> 
> Yes, that's my fault. I'm not quite sure why we would need this reg property. In
> any case also we have it present "dtbs_check W=1" throws the following warning:
> mediatek/mt8183.dtsi:1234.22-1246.5: Warning (avoid_unnecessary_addr_size):
> /soc/dsi@...14000: unnecessary #address-cells/#size-cells without "ranges" or
> child "reg" property
> 
> 
> Can you have a look at that?
> 

I think it is needed reg. See at
Documentation/devicetree/bindings/display/dsi-controller.yaml

Regards,
Enric

> Regards,
> Matthias
> 
>>> --
>>> 2.30.2
>>>