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From:   Chen-Yu Tsai <wens@csie.org>
Date:   Tue, 15 May 2018 23:42:01 -0700
Message-ID: <CAGb2v64CASge22O0CviNmgEV0CSFgipkKu86F-6hiaLChPh_EA@mail.gmail.com>
Subject: Re: [PATCH 4/6] drm/panel: simple: Add support for Banana Pi 7"
 S070WV20-CT16 panel
To:     Jagan Teki <jagan@amarulasolutions.com>
Cc:     Maxime Ripard <maxime.ripard@bootlin.com>,
        David Airlie <airlied@linux.ie>,
        Thierry Reding <thierry.reding@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        devicetree <devicetree@vger.kernel.org>,
        Jonathan Liu <net147@gmail.com>
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On Mon, May 14, 2018 at 11:03 AM, Jagan Teki <jagan@amarulasolutions.com> wrote:
> On Thu, Apr 19, 2018 at 3:02 PM, Chen-Yu Tsai <wens@csie.org> wrote:
>> This panel is marketed as Banana Pi 7" LCD display. On the back is
>> a sticker denoting the model name S070WV20-CT16.
>>
>> This is a 7" 800x480 panel connected through a 24-bit RGB interface.
>> However the panel only does 262k colors.
>>
>> Signed-off-by: Chen-Yu Tsai <wens@csie.org>
>> ---
>>  .../display/panel/bananapi,s070wv20-ct16.txt  |  7 ++++++
>>  drivers/gpu/drm/panel/panel-simple.c          | 25 +++++++++++++++++++
>>  2 files changed, 32 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/display/panel/bananapi,s070wv20-ct16.txt
>>
>> diff --git a/Documentation/devicetree/bindings/display/panel/bananapi,s070wv20-ct16.txt b/Documentation/devicetree/bindings/display/panel/bananapi,s070wv20-ct16.txt
>> new file mode 100644
>> index 000000000000..2ec35ce36e9a
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/panel/bananapi,s070wv20-ct16.txt
>> @@ -0,0 +1,7 @@
>> +Banana Pi 7" (S070WV20-CT16) TFT LCD Panel
>> +
>> +Required properties:
>> +- compatible: should be "bananapi,s070wv20-ct16"
>> +
>> +This binding is compatible with the simple-panel binding, which is specified
>> +in simple-panel.txt in this directory.
>> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
>> index cbf1ab404ee7..9bc037f74d6c 100644
>> --- a/drivers/gpu/drm/panel/panel-simple.c
>> +++ b/drivers/gpu/drm/panel/panel-simple.c
>> @@ -745,6 +745,28 @@ static const struct panel_desc avic_tm070ddh03 = {
>>         },
>>  };
>>
>> +static const struct drm_display_mode bananapi_s070wv20_ct16_mode = {
>> +       .clock = 30000,
>> +       .hdisplay = 800,
>> +       .hsync_start = 800 + 40,
>> +       .hsync_end = 800 + 40 + 48,
>> +       .htotal = 800 + 40 + 48 + 40,
>> +       .vdisplay = 480,
>> +       .vsync_start = 480 + 13,
>> +       .vsync_end = 480 + 13 + 3,
>> +       .vtotal = 480 + 13 + 3 + 29,
>> +};
>> +
>> +static const struct panel_desc bananapi_s070wv20_ct16 = {
>> +       .modes = &bananapi_s070wv20_ct16_mode,
>> +       .num_modes = 1,
>> +       .bpc = 6,
>> +       .size = {
>> +               .width = 154,
>> +               .height = 86,
>> +       },
>> +};
>
> I think this parallel RGB interface right? I too have same display
> with DSI I'm sure these setting will not useful right? do we need to
> write separate panel driver for that?

AFAIK the DSI model is an RGB panel with a MIPI DSI bridge on the
connector board. The model I have is dual interface.

ChenYu