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

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Message-ID: <1510929383.8104.3.camel@pengutronix.de>
Date:   Fri, 17 Nov 2017 15:36:23 +0100
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Lukasz Majewski <lukma@...x.de>, Shawn Guo <shawnguo@...nel.org>
Cc:     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

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. 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