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

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Message-ID: <20241126-overjoyed-futuristic-saluki-cb6cc7@houat>
Date: Tue, 26 Nov 2024 09:43:17 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Liu Ying <victor.liu@....com>
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 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?

Maxime

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