dt-bindings: display: Document the EDT et* displays in one file.

Document the Emerging Display Technology Corp. (EDT) using the
simple-panel binding in one single file.
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NJan Tuerk <jan.tuerk@emtrion.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180619095546.24445-1-jan.tuerk@emtrion.com

Documentation/devicetree/bindings/display/panel/edt,et-series.txt

+Emerging Display Technology Corp. Displays
+==========================================
+
+
+Display bindings for EDT Display Technology Corp. Displays which are
+compatible with the simple-panel binding, which is specified in
+simple-panel.txt
+
+
+5,7" WVGA TFT Panels
+--------------------
+
++-----------------+---------------------+-------------------------------------+
+| Identifier      | compatbile          | description                         |
++=================+=====================+=====================================+
+| ET057090DHU     | edt,et057090dhu     | 5.7" VGA TFT LCD panel              |
++-----------------+---------------------+-------------------------------------+
+
+
+7,0" WVGA TFT Panels
+--------------------
+
++-----------------+---------------------+-------------------------------------+
+| Identifier      | compatbile          | description                         |
++=================+=====================+=====================================+
+| ETM0700G0DH6    | edt,etm070080dh6    | WVGA TFT Display with capacitive    |
+|                 |                     | Touchscreen                         |
++-----------------+---------------------+-------------------------------------+
+| ETM0700G0BDH6   | edt,etm070080bdh6   | Same as ETM0700G0DH6 but with       |
+|                 |                     | inverted pixel clock.               |
++-----------------+---------------------+-------------------------------------+
+| ETM0700G0EDH6   | edt,etm070080edh6   | Same display as the ETM0700G0BDH6,  |
+|                 |                     | but with changed Hardware for the   |
+|                 |                     | backlight and the touch interface   |
++-----------------+---------------------+-------------------------------------+
+| ET070080DH6     | edt,etm070080dh6    | Same timings as the ETM0700G0DH6,   |
+|                 |                     | but with resistive touch.           |
++-----------------+---------------------+-------------------------------------+
+

Documentation/devicetree/bindings/display/panel/edt,et057090dhu.txt

-Emerging Display Technology Corp. 5.7" VGA TFT LCD panel
-
-Required properties:
-- compatible: should be "edt,et057090dhu"
-
-This binding is compatible with the simple-panel binding, which is specified
-in simple-panel.txt in this directory.

Documentation/devicetree/bindings/display/panel/edt,et070080dh6.txt

-Emerging Display Technology Corp. ET070080DH6 7.0" WVGA TFT LCD panel
-
-Required properties:
-- compatible: should be "edt,et070080dh6"
-
-This panel is the same as ETM0700G0DH6 except for the touchscreen.
-ET070080DH6 is the model with resistive touch.
-
-This binding is compatible with the simple-panel binding, which is specified
-in simple-panel.txt in this directory.

Documentation/devicetree/bindings/display/panel/edt,etm0700g0dh6.txt

-Emerging Display Technology Corp. ETM0700G0DH6 7.0" WVGA TFT LCD panel
-
-Required properties:
-- compatible: should be "edt,etm0700g0dh6"
-
-This panel is the same as ET070080DH6 except for the touchscreen.
-ETM0700G0DH6 is the model with capacitive multitouch.
-
-This binding is compatible with the simple-panel binding, which is specified
-in simple-panel.txt in this directory.