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From:   Jagan Teki <jagan@amarulasolutions.com>
Date:   Wed, 16 May 2018 12:50:58 +0530
Message-ID: <CAMty3ZBSkrdV=SPqK5UoBTN8b+KLD9vsgDkx6DYLxEfb9_TazA@mail.gmail.com>
Subject: Re: [PATCH 4/6] drm/panel: simple: Add support for Banana Pi 7"
 S070WV20-CT16 panel
To:     Chen-Yu Tsai <wens@csie.org>
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 Wed, May 16, 2018 at 12:12 PM, Chen-Yu Tsai <wens@csie.org> wrote:
> 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.

Yes, this is what I have [1] where same strip can use for both RGB and
MIPI DSI. can bananapi,s070wv20-ct16 work for DSI interface as well?

[1] https://www.aliexpress.com/item/New-Arrival-Banana-Pro-Pi-7-inch-LCD-Display-Touch-Screen-Raspberry-Pi-Car-GPS-FreeShipping/32335608836.html

Jagan.