linux-kernel - [PATCH v2 1/2] dt-binding: leds: Document leds-multi-gpio bindings

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Message-ID: <20210326052801.17666-2-chenhui.zhang@axis.com>
Date:   Fri, 26 Mar 2021 13:28:00 +0800
From:   Hermes Zhang <chenhui.zhang@...s.com>
To:     <pavel@....cz>, <dmurphy@...com>, <robh+dt@...nel.org>
CC:     <linux-leds@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <chenhuiz@...s.com>,
        <lkml@...s.com>, <kernel@...s.com>
Subject: [PATCH v2 1/2] dt-binding: leds: Document leds-multi-gpio bindings

From: Hermes Zhang <chenhuiz@...s.com>

This binding represents LED devices which are controller with
multiple GPIO lines in order to achieve more than two brightness
states.

Signed-off-by: Hermes Zhang <chenhuiz@...s.com>
---
 .../bindings/leds/leds-multi-gpio.yaml        | 50 +++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-multi-gpio.yaml

diff --git a/Documentation/devicetree/bindings/leds/leds-multi-gpio.yaml b/Documentation/devicetree/bindings/leds/leds-multi-gpio.yaml
new file mode 100644
index 000000000000..1549f21e8d6e
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-multi-gpio.yaml
@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/leds-multi-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Multiple GPIOs LED driver
+
+maintainers:
+  - Hermes Zhang <chenhuiz@...s.com>
+
+description:
+  This will support some LED made of multiple GPIOs and the brightness of the
+  LED could map to different states of the GPIOs.
+
+properties:
+  compatible:
+    const: multi-gpio-led
+
+  led-gpios:
+    description: Array of one or more GPIOs pins used to control the LED.
+    minItems: 1
+    maxItems: 8  # Should be enough
+
+  led-states:
+    description: |
+      The array list the supported states here which will map to brightness
+      from 0 to maximum. Each item in the array will present all the GPIOs
+      value by bit.
+    $ref: /schemas/types.yaml#/definitions/uint8-array
+    minItems: 1
+    maxItems: 256 # Should be enough
+
+required:
+  - compatible
+  - led-gpios
+  - led-states
+
+additionalProperties: false
+
+examples:
+  - |
+    gpios-led {
+      compatible = "multi-gpio-led";
+
+      led-gpios = <&gpio0 23 0x1>,
+                  <&gpio0 24 0x1>;
+      led-states = /bits/ 8 <0x00 0x01 0x02 0x03>;
+    };
+...
-- 
2.20.1