| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20260120-ltc3220-driver-v3-1-fef612ec4faa@analog.com>
Date: Tue, 20 Jan 2026 13:35:06 +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 v3 1/2] dt-bindings: leds: Add LTC3220 18 channel LED
Driver
Document device tree bindings for the LTC3220 18-channel LED driver
with I2C interface, individual brightness control, and hardware-assisted
blink/gradation features.
Signed-off-by: Edelweise Escala <edelweise.escala@...log.com>
---
.../devicetree/bindings/leds/leds-ltc3220.yaml | 120 +++++++++++++++++++++
MAINTAINERS | 7 ++
2 files changed, 127 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..6274c6c6ad79
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-ltc3220.yaml
@@ -0,0 +1,120 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/leds-ltc3220.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices LTC3220 LED Driver
+
+maintainers:
+ - Edelweise Escala <edelweise.escala@...log.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@([1-9]|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).
+ 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..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
Powered by blists - more mailing lists