linux-kernel - Re: [PATCH 1/2] ARM: dts: Add the support for display5 equipped with Mitsubishi (800x480) display

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Date:   Fri, 17 Nov 2017 16:03:47 +0100
From:   Lukasz Majewski <lukma@...x.de>
To:     Lucas Stach <l.stach@...gutronix.de>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] ARM: dts: Add the support for display5 equipped
 with Mitsubishi (800x480) display

Hi Lucas,

> Am Freitag, den 17.11.2017, 15:13 +0100 schrieb Lukasz Majewski:
> > Hi Shawn,
> >   
> > > On Fri, Nov 17, 2017 at 11:24:03AM +0100, Lukasz Majewski wrote:  
> > > > This is the support for aa070mc01-ca1 Mitsubishi display.
> > > > 
> > > > Signed-off-by: Lukasz Majewski <lukma@...x.de>
> > > > ---
> > > >  arch/arm/boot/dts/Makefile                         |  1 +
> > > >  .../imx6q-display5-mitsubishi-aa070-800x480.dts    | 51
> > > > ++++++++++++++++++++++ 2 files changed, 52 insertions(+)
> > > >  create mode 100644
> > > > arch/arm/boot/dts/imx6q-display5-mitsubishi-aa070-800x480.dts
> > > > 
> > > > diff --git a/arch/arm/boot/dts/Makefile
> > > > b/arch/arm/boot/dts/Makefile
> > > > index d9d0c82e7d20..10b3ad078dea 100644
> > > > --- a/arch/arm/boot/dts/Makefile
> > > > +++ b/arch/arm/boot/dts/Makefile
> > > > @@ -407,6 +407,7 @@ dtb-$(CONFIG_SOC_IMX6Q) += \
> > > >  	imx6q-cm-fx6.dtb \
> > > >  	imx6q-cubox-i.dtb \
> > > >  	imx6q-dfi-fs700-m60.dtb \
> > > > +	imx6q-display5-mitsubishi-aa070-800x480.dtb \
> > > >  	imx6q-display5-tianma-tm070-1280x768.dtb \
> > > >  	imx6q-dmo-edmqmx6.dtb \
> > > >  	imx6q-evi.dtb \    
> > > 
> > > <snip>
> > >   
> > > > +#include "imx6q-display5.dtsi"
> > > > +
> > > > +&panel {
> > > > +	compatible = "mitsubishi,aa070mc01-ca1";
> > > > +};    
> > > 
> > > How many DTB files do you want to add for this display5 board?    
> > 
> > This is a single board, which can support panels which I've posted.
> > 
> > Those dtbs I do pack to u-boot' FIT image and don't need to worry
> > that
> > some display is not working (after setting bootloader env variable).
> >   
> > > It's
> > > obvious no fun to maintain a bunch of DTB files for all the panels
> > > this board can support.  
> > 
> > Please note that those files excessively use #include directive, and
> > there is not so much code added (the longest part is license and
> > comments).
> >   
> > >  Let's stop right here.  
> > 
> > If I may ask - how shall I proceed? What would be your suggestion to
> > move on (dtb overlays) ?  
> 
> The solution we use for the ZII RDU1 and RDU2 boards is to have the
> bootloader patch in the correct panel compatible strings. 

Do you mean adjusting the DTB accordingly in u-boot for each display -
change panel/compatible to new display name ?

> This is
> quite a bit simpler than using overlays and if you already have a
> environment variable for this it should be easy to do.
> 
> > > 
> > > Shawn
> > >   
> > > > +
> > > > +&ldb {
> > > > +	lvds0: lvds-channel@0 {
> > > > +		fsl,data-mapping = "spwg";
> > > > +		fsl,data-width = <24>;
> > > > +	};
> > > > +};  
> 
> This isn't needed. The panel compatible implies the data mapping and
> bus width (at least if you properly filled in this information in the
> panel driver).
> 
> Regards,
> Lucas



Best regards,

Lukasz Majewski

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