Re: [PATCH v7 1/2] dt-bindings: leds: Add LTC3220 18 channel LED Driver

[Rob Herring <robh@kernel.org>]

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@microchip.com>
> Signed-off-by: Edelweise Escala <edelweise.escala@analog.com>
> ---
>  .../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@analog.com>
> +
> +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@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
> 
> -- 
> 2.43.0
>