Re: [PATCH v3 02/14] dt-bindings: display: Add Solomon SSD16xx e-paper controller

[Krzysztof Kozlowski]

On Tue, Oct 20, 2026 at 03:07:14AM +0530, Devarsh Thakkar wrote:
> Add device tree binding for the Solomon Systech SSD16xx family of e-Paper
> display controllers (SSD1683 [1], SSD1673 [3], SSD1680 [4], SSD1681 [5]).
> 
> The binding covers the 4-wire SPI interface with required GPIO pins for
> reset (active-low), busy status (active-high), and data/command selection.
> The spi-max-frequency is capped at 20 MHz per the SSD1683 datasheet [1]
> which is also the maximum supported frequency amongst the family.
> 
> An optional rotation property (as defined by panel-common, in degrees
> counter clockwise) allows static display orientation to be configured from
> device tree.
> 
> The data/command selection GPIO pin is also kept as optional since various
> SSD16XX controllers such as SSD1683 [1] support 3-wire mode too with
> data/command selection bit transmitted as first bit before sending the data
> sequence.
> 
> The first supported compatible is for Gooddisplay GDEY042T81 [2] which is
> 4.2", 400x300 resolution black/white e-paper display using SSD1683
> controller.
> 
> Links:
> [1] : https://www.crystalfontz.com/controllers/SolomonSystech/SSD1683
> [2] : https://files.seeedstudio.com/wiki/Other_Display/42-epaper/GDEY042T81.pdf
> [3] : https://www.crystalfontz.com/controllers/SolomonSystech/SSD1673
> [4] : https://www.crystalfontz.com/controllers/SolomonSystech/SSD1680
> [5] : https://www.crystalfontz.com/controllers/SolomonSystech/SSD1681
> 
> Signed-off-by: Devarsh Thakkar <devarsht@xxxxxx>
> ---
> Changes in v3:

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxxxxx>

Best regards,
Krzysztof