linux-kernel - Re: [DO NOT MERGE PATCH v4 16/19] arm64: dts: imx8qxp: Add display controller subsystem

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Message-ID: <43e266a6-411e-488d-a387-873ed874f32a@nxp.com>
Date: Tue, 26 Nov 2024 17:00:06 +0800
From: Liu Ying <victor.liu@....com>
To: Maxime Ripard <mripard@...nel.org>
Cc: Francesco Dolcini <francesco@...cini.it>,
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
 p.zabel@...gutronix.de, maarten.lankhorst@...ux.intel.com,
 tzimmermann@...e.de, airlied@...il.com, simona@...ll.ch, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, shawnguo@...nel.org,
 s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
 glx@...utronix.de, vkoul@...nel.org, kishon@...nel.org,
 aisheng.dong@....com, agx@...xcpu.org, frank.li@....com,
 dmitry.baryshkov@...aro.org
Subject: Re: [DO NOT MERGE PATCH v4 16/19] arm64: dts: imx8qxp: Add display
 controller subsystem

On 11/26/2024, Maxime Ripard wrote:
> On Tue, Nov 26, 2024 at 10:08:26AM +0800, Liu Ying wrote:
>> On 11/25/2024, Francesco Dolcini wrote:
>>> On Mon, Nov 25, 2024 at 05:33:13PM +0800, Liu Ying wrote:
>>>> Add display controller subsystem in i.MX8qxp SoC.
>>>>
>>>> Signed-off-by: Liu Ying <victor.liu@....com>
>>>
>>> ...
>>>
>>>> diff --git a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
>>>> index 05138326f0a5..35cc82cbbcd1 100644
>>>> --- a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
>>>> +++ b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
>>>> @@ -20,6 +20,27 @@ / {
>>>>  	#size-cells = <2>;
>>>>  
>>>>  	aliases {
>>>> +		dc0 = &dc0;
>>>> +		dc0-constframe0 = &dc0_constframe0;
>>>> +		dc0-constframe1 = &dc0_constframe1;
>>>> +		dc0-constframe4 = &dc0_constframe4;
>>>> +		dc0-constframe5 = &dc0_constframe5;
>>>> +		dc0-display-engine0 = &dc0_display_engine0;
>>>> +		dc0-display-engine1 = &dc0_display_engine1;
>>>> +		dc0-extdst0 = &dc0_extdst0;
>>>> +		dc0-extdst1 = &dc0_extdst1;
>>>> +		dc0-extdst4 = &dc0_extdst4;
>>>> +		dc0-extdst5 = &dc0_extdst5;
>>>> +		dc0-fetchlayer0 = &dc0_fetchlayer0;
>>>> +		dc0-fetchwarp2 = &dc0_fetchwarp2;
>>>> +		dc0-framegen0 = &dc0_framegen0;
>>>> +		dc0-framegen1 = &dc0_framegen1;
>>>> +		dc0-layerblend0 = &dc0_layerblend0;
>>>> +		dc0-layerblend1 = &dc0_layerblend1;
>>>> +		dc0-layerblend2 = &dc0_layerblend2;
>>>> +		dc0-layerblend3 = &dc0_layerblend3;
>>>> +		dc0-tcon0 = &dc0_tcon0;
>>>> +		dc0-tcon1 = &dc0_tcon1;
>>>
>>> what would you use those aliases for?
>>
>> They are used to get the instance numbers of display controller
>> and display controller's internal processing units from display
>> driver, e.g., patch 9 & 10 get instance numbers of some display
>> controller's internal processing units.
> 
> AFAIK, it's not listed anywhere in your bindings. Did you get an
> acked-by from a DT maintainer for those aliases as well?

Will document the aliases in DT bindings in next version so that
they can be explicitly acked by DT maintainers.  Thanks.

> 
> Maxime

-- 
Regards,
Liu Ying