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Message-ID: <20260106-ltc3220-driver-v1-1-73601d6f1649@analog.com>
Date: Tue, 6 Jan 2026 13:27:07 +0800
From: Edelweise Escala <edelweise.escala@...log.com>
To: Lee Jones <lee@...nel.org>, Pavel Machek <pavel@...nel.org>,
Rob Herring
<robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley
<conor+dt@...nel.org>
CC: <linux-leds@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
Edelweise Escala
<edelweise.escala@...log.com>
Subject: [PATCH 1/2] dt-bindings: leds: Document LTC3220 18 channel LED
Driver
Add dt-binding for ltc3220. LTC3220 18 Channel LED driver
Signed-off-by: Edelweise Escala <edelweise.escala@...log.com>
---
.../devicetree/bindings/leds/leds-ltc3220.yaml | 131 +++++++++++++++++++++
MAINTAINERS | 7 ++
2 files changed, 138 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..33285a7ac7a3
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-ltc3220.yaml
@@ -0,0 +1,131 @@
+# 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 Drivers
+
+maintainers:
+ - Edelweise Escala <edelweise.escala@...log.com>
+
+description: Bindings for the Analog Devices LTC3220 18 channel LED Drivers.
+
+ For more product information please see the link below
+ https://www.analog.com/en/products/ltc3220.html
+
+properties:
+ compatible:
+ enum:
+ - adi,ltc3220
+ - adi,ltc3220-1
+
+ reg:
+ maxItems: 1
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+ reset-gpios:
+ maxItems: 1
+ description: GPIO attached to the chip's reset pin
+
+ adi,force-cpo-level:
+ $ref: /schemas/types.yaml#/definitions/string
+ description: Forces the Charge Pump Output to a specified multiplier.
+ enum:
+ - "0" # Auto(default) - Automatically selects optimal charge pump mode
+ - "1.5"
+ - "2"
+ - "1"
+ default: "0"
+
+ adi,quick-write:
+ type: boolean
+ description: If present, LED 1 output becomes a master control that
+ simultaneously updates all 18 LED outputs using the hardware's quick-write
+ mode. When enabled, led@1 must be defined in the device tree to provide
+ the control interface, even if no physical LED is connected to the D1
+ output pin. When disabled or not present, LED 1 operates as a normal
+ independent LED output.
+
+patternProperties:
+ "^led@([1-9]|1[0-8])$":
+ 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,force-cpo-level = "0";
+ 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@...log.com>
+L: linux-leds@...r.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@...log.com>
L: linux-hwmon@...r.kernel.org
--
2.43.0
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