linux-kernel - [PATCH v5 2/3] dt-bindings: auxdisplay: Add bindings for generic 7-segment LED

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Message-ID: <20240306235021.976083-3-chris.packham@alliedtelesis.co.nz>
Date: Thu,  7 Mar 2024 12:50:20 +1300
From: Chris Packham <chris.packham@...iedtelesis.co.nz>
To: andy@...nel.org,
	geert@...ux-m68k.org,
	robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org,
	andrew@...n.ch,
	gregory.clement@...tlin.com,
	sebastian.hesselbarth@...il.com,
	lee@...nel.org
Cc: linux-leds@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Chris Packham <chris.packham@...iedtelesis.co.nz>
Subject: [PATCH v5 2/3] dt-bindings: auxdisplay: Add bindings for generic 7-segment LED

Add bindings for a generic 7-segment LED display using GPIOs.

Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
---

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@...iedtelesis.co.nz>
+
+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