linux-kernel - Re: [PATCH 2/4] drm/panel: simple: Add support for the Lemaker BL035 3.5" LCD

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Message-ID: <30178c8b263656a9c285e45c78e1908927c99c48.camel@paulk.fr>
Date:   Tue, 23 Oct 2018 12:08:17 +0200
From:   Paul Kocialkowski <contact@...lk.fr>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>, linux-sunxi@...glegroups.com,
        Mark Van den Borre <mark@...dem.org>,
        Gerry Demaret <gerry@...dem.org>,
        Luc Verhaegen <libv@...net.be>
Subject: Re: [PATCH 2/4] drm/panel: simple: Add support for the Lemaker
 BL035 3.5" LCD

Hi,

Le mercredi 10 octobre 2018 à 16:58 +0200, Maxime Ripard a écrit :
> On Wed, Oct 10, 2018 at 01:41:32PM +0200, Paul Kocialkowski wrote:
> > This adds support for the 3.5" LCD panel from Lemaker, sold for use with
> > BananaPi boards. It comes with a 24-bit RGB888 parallel interface and
> > requires an active-low DE signal
> > 
> > Signed-off-by: Paul Kocialkowski <contact@...lk.fr>
> > ---
> >  drivers/gpu/drm/panel/panel-simple.c | 27 +++++++++++++++++++++++++++
> >  1 file changed, 27 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> > index 97964f7f2ace..229080fcf65e 100644
> > --- a/drivers/gpu/drm/panel/panel-simple.c
> > +++ b/drivers/gpu/drm/panel/panel-simple.c
> > @@ -1461,6 +1461,30 @@ static const struct panel_desc kyo_tcg121xglp = {
> >  	.bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG,
> >  };
> >  
> > +static const struct drm_display_mode lemaker_bl035_mode = {
> > +	.clock = 7000,
> > +	.hdisplay = 320,
> > +	.hsync_start = 320 + 20,
> > +	.hsync_end = 320 + 20 + 30,
> > +	.htotal = 320 + 20 + 30 + 38,
> > +	.vdisplay = 240,
> > +	.vsync_start = 240 + 4,
> > +	.vsync_end = 240 + 4 + 3,
> > +	.vtotal = 240 + 4 + 3 + 15,
> > +	.vrefresh = 60,
> > +};
> > +
> > +static const struct panel_desc lemaker_bl035 = {
> > +	.modes = &lemaker_bl035_mode,
> > +	.num_modes = 1,
> > +	.size = {
> > +		.width = 70,
> > +		.height = 52,
> > +	},
> > +	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
> > +	.bus_flags = DRM_BUS_FLAG_DE_LOW,
> > +};
> > +
> >  static const struct drm_display_mode lg_lb070wv8_mode = {
> >  	.clock = 33246,
> >  	.hdisplay = 800,
> > @@ -2456,6 +2480,9 @@ static const struct of_device_id platform_of_match[] = {
> >  	}, {
> >  		.compatible = "kyo,tcg121xglp",
> >  		.data = &kyo_tcg121xglp,
> > +	}, {
> > +		.compatible = "lemaker,bl035",
> > +		.data = &lemaker_bl035,
> 
> You should document that new compatible. Also, where is this name
> coming from? Is it the name it's sold under? something you came up
> with?

Oh right, I forgot to document the compatible (and add the new vendor).

The name "BL035" comes from the PCB itself, where it reads "BL035-RGB-
002" under the Lemaker logo. I went for "BL035" to keep it short.

The latter part seems to be the PCB revision. According to the fex
files[0], the timings are the same for all the screens of the same size
(regardless of revision), so that revision probably shouldn't be in the
panel name.

As for the "RGB" part, Lemaker only makes 3.5 and 5 inch LCDs with a
parallel RGB interface and 7 and 10.1 inch LCDs with LVDS, so there is
no ambiguity for now.

Do you think it makes sense to keep that part in the panel name
nevertheless?

[0]: https://github.com/LeMaker/fex_configuration

Cheers,

Paul

-- 
Developer of free digital technology and hardware support.

Website: https://www.paulk.fr/
Coding blog: https://code.paulk.fr/
Git repositories: https://git.paulk.fr/ https://git.code.paulk.fr/

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