Re: [PATCH v7 1/2] dt-bindings: leds: Add LTC3220 18 channel LED Driver
From: Rob Herring
Date: Fri May 08 2026 - 10:03:01 EST
On Fri, May 08, 2026 at 12:09:49PM +0800, Edelweise Escala wrote:
> 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.
>
> Reviewed-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
> Signed-off-by: Edelweise Escala <edelweise.escala@xxxxxxxxxx>
> ---
> .../devicetree/bindings/leds/adi,ltc3220.yaml | 120 +++++++++++++++++++++
> MAINTAINERS | 7 ++
> 2 files changed, 127 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/leds/adi,ltc3220.yaml b/Documentation/devicetree/bindings/leds/adi,ltc3220.yaml
> new file mode 100644
> index 000000000000..62f760d517aa
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/adi,ltc3220.yaml
> @@ -0,0 +1,120 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/adi,ltc3220.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices LTC3220 LED Driver
> +
> +maintainers:
> + - Edelweise Escala <edelweise.escala@xxxxxxxxxx>
> +
> +description:
You need a '>' to maintain paragraphs.
> + 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@([1-9]|1[0-8])$':
Unit-addresses are hex.
> + 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).
> + For aggregated LED control, define only one LED node with reg = <1>
> + and use led-sources to list all controlled outputs. Only reg 1 should
> + be present when using led-sources.
> + minimum: 1
> + maximum: 18
> +
> + required:
> + - reg
> +
> +required:
> + - compatible
> + - reg
> +
> +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 = <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>;
> + };
> + };
> + };
> +
> + - |
> + // 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 = <1>;
> + led-sources = <1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18>;
> + function = LED_FUNCTION_BACKLIGHT;
> + };
> + };
> + };
> +
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 327d74ca7ecb..5c10cc3e3022 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@xxxxxxxxxx>
> +L: linux-leds@xxxxxxxxxxxxxxx
> +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@xxxxxxxxxx>
> L: linux-hwmon@xxxxxxxxxxxxxxx
>
> --
> 2.43.0
>