[PATCH v4 1/2] dt-bindings: leds: Document LTC3208 Multidisplay LED Driver

Jan Carlo Roleda
2026-04-16T02:39:35Z

Add Devicetree Documentation for LTC3208 Multidisplay LED Driver.

Signed-off-by: Jan Carlo Roleda <jancarlo.roleda@analog.com>
---
.../devicetree/bindings/leds/adi,ltc3208.yaml | 181 +++++++++++++++++++++
MAINTAINERS | 7 +
2 files changed, 188 insertions(+)

diff --git a/Documentation/devicetree/bindings/leds/adi,ltc3208.yaml b/Documentation/devicetree/bindings/leds/adi,ltc3208.yaml
new file mode 100644
index 000000000000..0a01e07e0ab7
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/adi,ltc3208.yaml
@@ -0,0 +1,181 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (c) 2026 Analog Devices, Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/adi,ltc3208.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LTC3208 Multidisplay LED Controller from Linear Technologies (Now Analog Devices)
+
+maintainers:
+ - Jan Carlo Roleda <jancarlo.roleda@analog.com>
+
+description:
+ The LTC3208 is a multidisplay LED controller that can support up to 1A to all
+ connected LEDs.
+
+ The datasheet for this device can be found in
+ https://www.analog.com/en/products/ltc3208.html
+
+properties:
+ compatible:
+ const: adi,ltc3208
+
+ reg:
+ maxItems: 1
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
+ adi,disable-camhl-pin:
+ type: boolean
+ description:
+ Configures whether the external CAMHL pin is disabled.
+ If disabled then the output pins associated with CAM will always select
+ the CAM register's high half-byte brightness.
+
+ adi,cfg-enrgbs-pin:
+ type: boolean
+ description:
+ Configures which channel the ENRGBS pin toggles when it receives a signal.
+ ENRGBS pin controls the SUB channel's output pins if this is set,
+ or RGB channel's output pins if this is unset.
+
+ adi,disable-rgb-aux4-dropout:
+ type: boolean
+ description:
+ Configures the RGB and AUX4 dropout signals to be disabled.
+
+ adi,aux1-channel:
+ $ref: /schemas/types.yaml#/definitions/string
+ description:
+ LED Channel that the AUX1 output pin mirrors its brightness level from.
+ enum: [aux, main, sub, cam]
+ default: aux
+
+ adi,aux2-channel:
+ $ref: /schemas/types.yaml#/definitions/string
+ description:
+ LED Channel that the AUX2 output pin mirrors its brightness level from.
+ enum: [aux, main, sub, cam]
+ default: aux
+
+ adi,aux3-channel:
+ $ref: /schemas/types.yaml#/definitions/string
+ description:
+ LED Channel that the AUX3 output pin mirrors its brightness level from.
+ enum: [aux, main, sub, cam]
+ default: aux
+
+ adi,aux4-channel:
+ $ref: /schemas/types.yaml#/definitions/string
+ description:
+ LED Channel that the AUX4 output pin mirrors its brightness level from.
+ enum: [aux, main, sub, cam]
+ default: aux
+
+patternProperties:
+ "^led@[0-7]$":
+ type: object
+ $ref: /schemas/leds/common.yaml#
+ unevaluatedProperties: false
+ properties:
+ reg:
+ description:
+ LED Channel Number. each channel maps to a specific channel group used
+ to configure the brightness level of the output pins corresponding to
+ the channel.
+ enum:
+ - 0 # Main Channel (8-bit brightness)
+ - 1 # Sub Channel (8-bit brightness)
+ - 2 # AUX Channel (4-bit brightness)
+ - 3 # Camera Channel, Low-side byte (4-bit brightness)
+ - 4 # Camera Channel, High-side byte (4-bit brightness)
+ - 5 # Red Channel (4-bit brightness)
+ - 6 # Blue Channel (4-bit brightness)
+ - 7 # Green Channel (4-bit brightness)
+ required:
+ - reg
+
+required:
+ - compatible
+ - reg
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/leds/common.h>
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ led-controller@1b {
+ compatible = "adi,ltc3208";
+ reg = <0x1b>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ adi,disable-camhl-pin;
+ adi,cfg-enrgbs-pin;
+ adi,disable-rgb-aux4-dropout;
+
+ /* MAIN */
+ led@0 {
+ reg = <0>;
+ function = LED_FUNCTION_ACTIVITY;
+ color = <LED_COLOR_ID_WHITE>;
+ };
+
+ /* SUB */
+ led@1 {
+ reg = <1>;
+ function = LED_FUNCTION_ACTIVITY;
+ color = <LED_COLOR_ID_WHITE>;
+ };
+
+ /* AUX */
+ led@2 {
+ reg = <2>;
+ function = LED_FUNCTION_ACTIVITY;
+ color = <LED_COLOR_ID_WHITE>;
+ };
+
+ /* CAMLO */
+ led@3 {
+ reg = <3>;
+ function = LED_FUNCTION_FLASH;
+ color = <LED_COLOR_ID_WHITE>;
+ };
+
+ /* CAMHI */
+ led@4 {
+ reg = <4>;
+ function = LED_FUNCTION_FLASH;
+ color = <LED_COLOR_ID_WHITE>;
+ };
+
+ /* RED */
+ led@5 {
+ reg = <5>;
+ function = LED_FUNCTION_INDICATOR;
+ color = <LED_COLOR_ID_RED>;
+ };
+
+ /* BLUE */
+ led@6 {
+ reg = <6>;
+ function = LED_FUNCTION_INDICATOR;
+ color = <LED_COLOR_ID_BLUE>;
+ };
+
+ /* GREEN */
+ led@7 {
+ reg = <7>;
+ function = LED_FUNCTION_INDICATOR;
+ color = <LED_COLOR_ID_GREEN>;
+ };
+ };
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 55af015174a5..19b0b84e934d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15126,6 +15126,13 @@ W: https://ez.analog.com/linux-software-drivers
F: Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
F: drivers/iio/temperature/ltc2983.c

+LTC3208 LED DRIVER
+M: Jan Carlo Roleda <jancarlo.roleda@analog.com>
+L: linux-leds@vger.kernel.org
+S: Maintained
+W: https://ez.analog.com/linux-software-drivers
+F: Documentation/devicetree/bindings/leds/adi,ltc3208.yaml
+
LTC4282 HARDWARE MONITOR DRIVER
M: Nuno Sa <nuno.sa@analog.com>
L: linux-hwmon@vger.kernel.org

--
2.43.0