linux-kernel - Re: [PATCH 2/2] drm/panel: Add driver for sitronix ST7789V panel

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Date:   Mon, 6 Feb 2017 11:50:37 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Noralf Trønnes <noralf@...nnes.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 2/2] drm/panel: Add driver for sitronix ST7789V panel

Hi Noralf,

On Fri, Feb 03, 2017 at 07:53:58PM +0100, Noralf Trønnes wrote:
> 
> Den 03.02.2017 10.59, skrev Maxime Ripard:
> > Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> > ---
> >   drivers/gpu/drm/panel/Kconfig                  |   4 +-
> >   drivers/gpu/drm/panel/Makefile                 |   1 +-
> >   drivers/gpu/drm/panel/panel-sitronix-st7789v.c | 435 ++++++++++++++++++-
> >   3 files changed, 440 insertions(+), 0 deletions(-)
> >   create mode 100644 drivers/gpu/drm/panel/panel-sitronix-st7789v.c
> > 
> > diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> > index 62aba976e744..d07b996a07b8 100644
> > --- a/drivers/gpu/drm/panel/Kconfig
> > +++ b/drivers/gpu/drm/panel/Kconfig
> > @@ -81,4 +81,8 @@ config DRM_PANEL_SHARP_LS043T1LE01
> >   	  Say Y here if you want to enable support for Sharp LS043T1LE01 qHD
> >   	  (540x960) DSI panel as found on the Qualcomm APQ8074 Dragonboard
> > +config DRM_PANEL_SITRONIX_ST7789V
> > +	tristate "Sitronx ST7789V panel"
> > +	depends on OF && SPI
> > +
> >   endmenu
> > diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> > index a5c7ec0236e0..41b245d39984 100644
> > --- a/drivers/gpu/drm/panel/Makefile
> > +++ b/drivers/gpu/drm/panel/Makefile
> > @@ -6,3 +6,4 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
> >   obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
> >   obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
> >   obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o
> > +obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
> > diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7789v.c b/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
> > new file mode 100644
> > index 000000000000..aab817b55aa6
> > --- /dev/null
> > +++ b/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
> > @@ -0,0 +1,435 @@
> > +/*
> > + * Copyright (C) 2017 Free Electrons
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License version
> > + * 2 as published by the Free Software Foundation.
> > + */
> > +
> > +#include <drm/drmP.h>
> > +#include <drm/drm_panel.h>
> > +
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/spi/spi.h>
> > +
> > +#define ST7789V_SLPIN_CMD		0x10
> > +
> > +#define ST7789V_SLPOUT_CMD		0x11
> > +
> > +#define ST7789V_INVON_CMD		0x21
> > +
> > +#define ST7789V_DISPOFF_CMD		0x28
> > +
> > +#define ST7789V_DISPON_CMD		0x29
> > +
> > +#define ST7789V_MADCTL_CMD		0x36
> > +
> > +#define ST7789V_COLMOD_CMD		0x3a
> 
> You can use these from include/video/mipi_display.h:
> 
>         MIPI_DCS_ENTER_SLEEP_MODE       = 0x10,
>         MIPI_DCS_EXIT_SLEEP_MODE        = 0x11,
>         MIPI_DCS_ENTER_INVERT_MODE      = 0x21,
>         MIPI_DCS_SET_DISPLAY_OFF        = 0x28,
>         MIPI_DCS_SET_DISPLAY_ON         = 0x29,
>         MIPI_DCS_SET_ADDRESS_MODE       = 0x36,
>         MIPI_DCS_SET_PIXEL_FORMAT       = 0x3A,

I don't know, that controller cannot do MIPI DSI at all, and we would
have to define all the other commands anyway.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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