[PATCH v4 2/5] dt-bindings: display: ssd1307fb: Extend schema for SPI controllers

Javier Martinez Canillas
2022-04-13T16:24:37Z

The Solomon SSD130x OLED displays can either have an I2C or SPI interface,
add to the schema the properties and examples for OLED devices under SPI.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---

Changes in v4:
- Add a description for the dc-gpios property for SPI (Geert Uytterhoeven)

Changes in v3:
- Add a comment to the properties required for SPI (Geert Uytterhoeven)

Changes in v2:
- Don't add compatible strings with an "-spi" suffix (Geert Uytterhoeven)

.../bindings/display/solomon,ssd1307fb.yaml | 42 ++++++++++++++++++-
1 file changed, 40 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml b/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
index 7653b6c3fcb6..3fbd87c2c120 100644
--- a/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
+++ b/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
@@ -38,9 +38,20 @@ properties:
reset-gpios:
maxItems: 1

+ # Only required for SPI
+ dc-gpios:
+ description:
+ GPIO connected to the controller's D/C# (Data/Command) pin,
+ that is needed for 4-wire SPI to tell the controller if the
+ data sent is for a command register or the display data RAM
+ maxItems: 1
+
vbat-supply:
description: The supply for VBAT

+ # Only required for SPI
+ spi-max-frequency: true
+
solomon,height:
$ref: /schemas/types.yaml#/definitions/uint32
default: 16
@@ -220,14 +231,14 @@ examples:
#address-cells = <1>;
#size-cells = <0>;

- ssd1307: oled@3c {
+ ssd1307_i2c: oled@3c {
compatible = "solomon,ssd1307";
reg = <0x3c>;
pwms = <&pwm 4 3000>;
reset-gpios = <&gpio2 7>;
};

- ssd1306: oled@3d {
+ ssd1306_i2c: oled@3d {
compatible = "solomon,ssd1306";
reg = <0x3c>;
pwms = <&pwm 4 3000>;
@@ -238,3 +249,30 @@ examples:
solomon,lookup-table = /bits/ 8 <0x3f 0x3f 0x3f 0x3f>;
};
};
+ - |
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ ssd1307_spi: oled@0 {
+ compatible = "solomon,ssd1307";
+ reg = <0x0>;
+ pwms = <&pwm 4 3000>;
+ reset-gpios = <&gpio2 7>;
+ dc-gpios = <&gpio2 8>;
+ spi-max-frequency = <10000000>;
+ };
+
+ ssd1306_spi: oled@1 {
+ compatible = "solomon,ssd1306";
+ reg = <0x1>;
+ pwms = <&pwm 4 3000>;
+ reset-gpios = <&gpio2 7>;
+ dc-gpios = <&gpio2 8>;
+ spi-max-frequency = <10000000>;
+ solomon,com-lrremap;
+ solomon,com-invdir;
+ solomon,com-offset = <32>;
+ solomon,lookup-table = /bits/ 8 <0x3f 0x3f 0x3f 0x3f>;
+ };
+ };
--
2.35.1