dt-bindings: leds: Add LTC3220 18 channel LED Driver

LTC3220 is a multi-display LED driver with I2C interface. The LTC3220 provides individual brightness control (64-step), blinking, and gradation features for up to 18 LED outputs. Signed-off-by: Edelweise Escala <edelweise.escala@analog.com> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Link: https://patch.msgid.link/20260709-ltc3220-driver-v13-1-9b53237642eb@analog.com Signed-off-by: Lee Jones <lee@kernel.org>
2026-09-23 05:04:02 +02:00 · 2026-07-09 08:41:19 +08:00 · 2026-07-09 08:41:19 +08:00 · 3c28d9d0b7
commit 3c28d9d0b7
parent 627666f7c9
2 changed files with 140 additions and 0 deletions
--- a/Documentation/devicetree/bindings/leds/adi,ltc3220.yaml
+++ b/Documentation/devicetree/bindings/leds/adi,ltc3220.yaml
@ -0,0 +1,133 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/adi,ltc3220.yaml#
+$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
+
+patternProperties:
+  '^led@([1-9a-f]|1[0-2])$':
+    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).
+          Unit-address must be in hexadecimal (1-12 hex = 1-18 decimal).
+          For aggregated LED control, define only one LED node with reg = <0x1>
+          and use led-sources to list all controlled outputs. Only reg 1 should
+          be present when using led-sources.
+        items:
+          - minimum: 1
+            maximum: 18
+
+    required:
+      - reg
+
+    if:
+      required:
+        - led-sources
+    then:
+      properties:
+        reg:
+          items:
+            - const: 1
+
+required:
+  - compatible
+  - reg
+  - '#address-cells'
+  - '#size-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    // Independent LEDs
+    #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>;
+
+            led@1 {
+                reg = <0x1>;
+                function = LED_FUNCTION_INDICATOR;
+                function-enumerator = <1>;
+            };
+
+            led@2 {
+                reg = <0x2>;
+                function = LED_FUNCTION_INDICATOR;
+                function-enumerator = <2>;
+            };
+
+            led@3 {
+                reg = <0x3>;
+                function = LED_FUNCTION_INDICATOR;
+                function-enumerator = <3>;
+            };
+        };
+    };
+
+  - |
+    // Aggregated LED
+    #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>;
+
+            led@1 {
+                reg = <0x1>;
+                led-sources = <0x1 0x2 0x3 0x4 0x5 0x6 0x7 0x8 0x9 0xa 0xb 0xc 0xd 0xe 0xf 0x10 0x11 0x12>;
+                function = LED_FUNCTION_BACKLIGHT;
+            };
+        };
+    };
+
+...
--- a/7
+++ b/7
@ -15380,6 +15380,13 @@ 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/adi,ltc3220.yaml
+
 LTC4282 HARDWARE MONITOR DRIVER
 M:	Nuno Sa <nuno.sa@analog.com>
 L:	linux-hwmon@vger.kernel.org