Add bindings for a generic 7-segment LED display using GPIOs.
Signed-off-by: Chris Packham <chris.packham@xxxxxxxxxxxxxxxxxxx>
---
Notes:
Changes in v5:
- Preserve formatting, maxItems set to 8, group GPIO specifiers
as suggested by Geert
Changes in v4:
- Add ASCII art diagram showing arrangement of segments
Changes in v3:
- Set maxItems: 7
- Expand description of segment-gpios property.
- Use compatible = "gpio-7-segment" as suggested by Rob
Changes in v2:
- Use compatible = "generic-gpio-7seg" to keep checkpatch.pl happy
.../bindings/auxdisplay/gpio-7-segment.yaml | 55 +++++++++++++++++++
1 file changed, 55 insertions(+)
create mode 100644 Documentation/devicetree/bindings/auxdisplay/gpio-7-segment.yaml
diff --git a/Documentation/devicetree/bindings/auxdisplay/gpio-7-segment.yaml b/Documentation/devicetree/bindings/auxdisplay/gpio-7-segment.yaml
new file mode 100644
index 000000000000..328954893c64
--- /dev/null
+++ b/Documentation/devicetree/bindings/auxdisplay/gpio-7-segment.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/auxdisplay/gpio-7-segment.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GPIO based LED segment display
+
+maintainers:
+ - Chris Packham <chris.packham@xxxxxxxxxxxxxxxxxxx>
+
+properties:
+ compatible:
+ const: gpio-7-segment
+
+ segment-gpios:
+ description: |
+ An array of GPIOs one per segment. The first GPIO corresponds to the A
+ segment, the seventh GPIO corresponds to the G segment. Some LED blocks
+ also have a decimal point which can be specified as an optional eighth
+ segment.
+
+ -a-
+ | |
+ f b
+ | |
+ -g-
+ | |
+ e c
+ | |
+ -d- dp
+
+ minItems: 7
+ maxItems: 8
+
+required:
+ - segment-gpios
+
+additionalProperties: false
+
+examples:
+ - |
+
+ #include <dt-bindings/gpio/gpio.h>
+
+ led-7seg {
+ compatible = "gpio-7-segment";
+ segment-gpios = <&gpio 0 GPIO_ACTIVE_LOW>,
+ <&gpio 1 GPIO_ACTIVE_LOW>,
+ <&gpio 2 GPIO_ACTIVE_LOW>,
+ <&gpio 3 GPIO_ACTIVE_LOW>,
+ <&gpio 4 GPIO_ACTIVE_LOW>,
+ <&gpio 5 GPIO_ACTIVE_LOW>,
+ <&gpio 6 GPIO_ACTIVE_LOW>;
+ };
--
2.43.2
