[PATCH v2 1/2] dt-bindings: leds: Add LTC3220 18 channel LED Driver

[Edelweise Escala <edelweise.escala@analog.com>]

Document device tree bindings for the LTC3220 18-channel LED driver
with I2C interface, individual brightness control, and hardware-assisted
blink/gradation features.

Signed-off-by: Edelweise Escala <edelweise.escala@analog.com>
---
 .../devicetree/bindings/leds/leds-ltc3220.yaml     | 120 +++++++++++++++++++++
 MAINTAINERS                                        |   7 ++
 2 files changed, 127 insertions(+)

diff --git a/Documentation/devicetree/bindings/leds/leds-ltc3220.yaml b/Documentation/devicetree/bindings/leds/leds-ltc3220.yaml
new file mode 100644
index 000000000000..d0af38547b28
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-ltc3220.yaml
@@ -0,0 +1,120 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/leds-ltc3220.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices LTC3220 LED Driver
+
+maintainers:
+  - Edelweise Escala <edelweise.escala@analog.com>
+
+description:
+  The LTC3220 is a multi-display LED driver, which contains a high-efficiency,
+  low-noise charge pump to provide power to up to 18 LED current sources.
+  The LEDs are individually configurable to 64-step linear brightness control,
+  blinking and gradation control via 2-wire I2C interface.
+
+  For more product information please see the link below
+    https://www.analog.com/en/products/ltc3220.html
+
+properties:
+  compatible:
+    const: adi,ltc3220
+
+  reg:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  reset-gpios:
+    maxItems: 1
+
+  adi,quick-write:
+    type: boolean
+    description:
+      Enables the hardware quick-write feature where a write to the LED 1
+      output register simultaneously updates all 18 LED output registers
+      to the same value. Only applicable when LED 1 output is physically
+      present and defined in the device tree.
+
+patternProperties:
+  '^led@([1-9]|1[0-8])$':
+    type: object
+    $ref: /schemas/leds/common.yaml#
+    unevaluatedProperties: false
+    properties:
+      reg:
+        description: Output channel for the LED (1-18 maps to LED outputs D1-D18).
+        minimum: 1
+        maximum: 18
+
+    required:
+      - reg
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/leds/common.h>
+
+    i2c {
+       #address-cells = <1>;
+       #size-cells = <0>;
+
+       led-controller@1c {
+             compatible = "adi,ltc3220";
+             reg = <0x1c>;
+             #address-cells = <1>;
+             #size-cells = <0>;
+             reset-gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+             adi,quick-write;
+
+             led@1 {
+                 reg = <1>;
+                 function = LED_FUNCTION_INDICATOR;
+                 function-enumerator = <1>;
+             };
+
+             led@2 {
+                 reg = <2>;
+                 function = LED_FUNCTION_INDICATOR;
+                 function-enumerator = <2>;
+             };
+
+             led@3 {
+                 reg = <3>;
+                 function = LED_FUNCTION_INDICATOR;
+                 function-enumerator = <3>;
+             };
+
+             led@4 {
+                 reg = <4>;
+                 function = LED_FUNCTION_INDICATOR;
+                 function-enumerator = <4>;
+             };
+
+             led@5 {
+                 reg = <5>;
+                 function = LED_FUNCTION_INDICATOR;
+                 function-enumerator = <5>;
+             };
+
+             led@6 {
+                 reg = <6>;
+                 function = LED_FUNCTION_INDICATOR;
+                 function-enumerator = <6>;
+             };
+        };
+    };
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 327d74ca7ecb..d640c35d1f93 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14955,6 +14955,13 @@ W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
 F:	drivers/iio/temperature/ltc2983.c
 
+LTC3220 LED DRIVER
+M:	Edelweise Escala <edelweise.escala@analog.com>
+L:	linux-leds@vger.kernel.org
+S:	Maintained
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/leds/leds-ltc3220.yaml
+
 LTC4282 HARDWARE MONITOR DRIVER
 M:	Nuno Sa <nuno.sa@analog.com>
 L:	linux-hwmon@vger.kernel.org

-- 
2.43.0