linux-kernel - Re: [PATCH 2/4] dt-bindings: Document the Raspberry Pi Touchscreen nodes.

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Date:   Mon, 15 May 2017 17:03:29 -0700
From:   Eric Anholt <eric@...olt.net>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        dri-devel@...ts.freedesktop.org
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] dt-bindings: Document the Raspberry Pi Touchscreen nodes.

Laurent Pinchart <laurent.pinchart@...asonboard.com> writes:

> Hi Eric,
>
> Thank you for the patch.
>
> On Thursday 11 May 2017 16:56:23 Eric Anholt wrote:
>> The Raspberry Pi 7" Touchscreen is a DPI touchscreen panel with
>> DSI->DPI bridge and touchscreen controller integrated, that connects
>> to the Raspberry Pi through its 15-pin "DSI" connector (some lines are
>> DSI, some lines are I2C).
>> 
>> This device is represented in the DT as three nodes (DSI device, I2C
>> device, panel).  Input will be left to a separate binding later, as it
>> will be a basic I2C client device.
>> 
>> Signed-off-by: Eric Anholt <eric@...olt.net>
>> ---
>>  .../raspberrypi,7inch-touchscreen-bridge.txt       | 68 +++++++++++++++++++
>>  .../panel/raspberrypi,7inch-touchscreen-panel.txt  |  7 +++
>>  2 files changed, 75 insertions(+)
>>  create mode 100644
>> Documentation/devicetree/bindings/display/bridge/raspberrypi,7inch-touchscr
>> een-bridge.txt create mode 100644
>> Documentation/devicetree/bindings/display/panel/raspberrypi,7inch-touchscre
>> en-panel.txt
>> 
>> diff --git
>> a/Documentation/devicetree/bindings/display/bridge/raspberrypi,7inch-touchs
>> creen-bridge.txt
>> b/Documentation/devicetree/bindings/display/bridge/raspberrypi,7inch-touchs
>> creen-bridge.txt new file mode 100644
>> index 000000000000..a5669beaf68f
>> --- /dev/null
>> +++
>> b/Documentation/devicetree/bindings/display/bridge/raspberrypi,7inch-touchs
>> creen-bridge.txt @@ -0,0 +1,68 @@
>> +Official 7" (800x480) Raspberry Pi touchscreen panel's bridge.
>> +
>> +This DSI panel contains:
>> +
>> +- TC358762 DSI->DPI bridge
>> +- Atmel microcontroller on I2C for power sequencing the DSI bridge and
>> +  controlling backlight
>> +- Touchscreen controller on I2C for touch input
>> +
>> +and this covers the TC358762 bridge and Atmel microcontroller, while
>> +../panel/raspberrypi,7inch-touchscreen-panel.txt covers the panel.
>
> The TC358762 is a standalone bridge that doesn't depend on the ATTiny 
> microcontroller used by the RPI. As it's usable standalone, I believe this 
> binding should be split in two.

Do you have a plan for how I would implement a driver on top of that
binding change, though?  Note that we don't program the Toshiba
directly, we only send commands to the Atmel.

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