Messages in this thread |  | | Date | Thu, 7 May 2026 13:34:18 -0500 | | From | Rob Herring <> | | Subject | Re: [PATCH 2/6] dt-bindings/display: Add Solomon SSD16xx e-paper controller binding |
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On Fri, May 01, 2026 at 12:03:07AM +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 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 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@ti.com> > --- > .../bindings/display/solomon,ssd16xx.yaml | 81 +++++++++++++++++++ > 1 file changed, 81 insertions(+) > create mode 100644 Documentation/devicetree/bindings/display/solomon,ssd16xx.yaml > > diff --git a/Documentation/devicetree/bindings/display/solomon,ssd16xx.yaml b/Documentation/devicetree/bindings/display/solomon,ssd16xx.yaml > new file mode 100644 > index 000000000000..2433ddb859d6 > --- /dev/null > +++ b/Documentation/devicetree/bindings/display/solomon,ssd16xx.yaml > @@ -0,0 +1,81 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/display/solomon,ssd16xx.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Solomon Systech SSD16xx controller based e-paper display panels > + > +maintainers: > + - Devarsh Thakkar <devarsht@ti.com> > + > +description: > + The SSD16xx family includes e-paper display controllers (SSD1680, SSD1681, > + SSD1673, SSD1683) with integrated gate driver, source driver and timing controller. > + Different panels use these controllers in monochrome or 3-color configurations. > + The controller uses a 4-wire SPI interface and requires GPIO pins for reset, > + busy status, and data/command control with a 3-wire mode also available > + where D/C bit is transmitted along the SPI data line before sending actual data.
Wrap lines at 80 chars.
> + > +allOf: > + - $ref: /schemas/spi/spi-peripheral-props.yaml# > + > +properties: > + compatible: > + enum: > + - gooddisplay,gdey042t81 # 4.2" 400x300 monochrome (SSD1683 controller)
If you know the controller, make it a fallback compatible.
> + > + reg: > + maxItems: 1 > + > + spi-max-frequency: > + maximum: 20000000 > + > + reset-gpios: > + maxItems: 1 > + description: > + GPIO connected to the RSTB (reset) pin. Active low. > + > + busy-gpios: > + maxItems: 1 > + description: > + GPIO connected to the BUSY pin. Active high when the controller is > + busy updating the display. > + > + dc-gpios: > + maxItems: 1 > + description: > + GPIO connected to the D/C (Data/Command) pin. Low for command, high > + for data. > + > + rotation: > + enum: [0, 90, 180, 270] > + description: > + Display rotation in degrees counter clockwise (0,90,180,270) > + $ref: /schemas/types.yaml#/definitions/uint32 > + > +required: > + - compatible > + - reg > + - reset-gpios > + - busy-gpios > + > +unevaluatedProperties: false > + > +examples: > + - | > + #include <dt-bindings/gpio/gpio.h> > + > + spi { > + #address-cells = <1>; > + #size-cells = <0>; > + > + display@0 { > + compatible = "gooddisplay,gdey042t81"; > + reg = <0>; > + spi-max-frequency = <2000000>; > + reset-gpios = <&gpio1 17 GPIO_ACTIVE_LOW>; > + busy-gpios = <&gpio1 18 GPIO_ACTIVE_HIGH>; > + dc-gpios = <&gpio1 19 GPIO_ACTIVE_HIGH>; > + }; > + }; > -- > 2.39.1 >
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