Add LTC3220 driver

Documentation/ABI/testing/sysfs-class-led-driver-ltc3220

@@ -0,0 +1,48 @@
+What:		/sys/class/leds/<led>/shutdown
+Date:		November 2025
+Contact:	Edelweise Escala <edelweise.escala@analog.com>
+Description:	LTC3220 shutdown command. If you write 1 it
+		shuts down part while preserving data in registers.
+		If you write 0 device is in normal operation.
+
+What:		/sys/class/leds/<led>/force_cpo_mode
+Date:		November 2025
+Contact:	Edelweise Escala <edelweise.escala@analog.com>
+Description:	LTC3220 force charge pump settings (0..3):
+		0 - Enables mode logic to control mode changes based on dropout signal
+		1 - Forces charge pump into 1.5x mode
+		2 - Forces charge pump into 2x mode
+		3 - Forces charge pump into 1x mode
+
+What:		/sys/class/leds/<led>/quick_write
+Date:		November 2025
+Contact:	Edelweise Escala <edelweise.escala@analog.com>
+Description:	LTC3220 quick_write setting. LTC3220 has a quick write configuration
+		which allows parallel write on all 18 LED registers, when data is being written on
+		REG1. If you write 1 quick_write is enabled, 0 to disable.
+
+What:		/sys/class/leds/<led>/gradation_speed
+Date:		November 2025
+Contact:	Edelweise Escala <edelweise.escala@analog.com>
+Description:	LTC3220 gradation speed (0..3) where:
+		0 - disabled
+		1 - Ramp time of 0.24s and Period of 0.313s
+		2 - Ramp time of 0.48s and Period of 0.625s
+		3 - Ramp time of 0.96s and Period of 1.25s
+
+What:		/sys/class/leds/<led>/gradation_is_increasing
+Date:		November 2025
+Contact:	Edelweise Escala <edelweise.escala@analog.com>
+Description:	LTC3220 gradation increasing command. This sets if gradation
+		will ramp up or down. If you write 1 it gradation will ramp up, 0 will
+		ramp down.
+
+What:		/sys/class/leds/<led>/blink_cfg
+Date:		November 2025
+Contact:	Edelweise Escala <edelweise.escala@analog.com>
+Description:	LTC3220 device blink setting. The blink settings for all LEDs
+		(0..3) where:
+		0 - On Time of 0.625s and Period of 1.25s
+		1 - On Time of 0.156s and Period of 1.25s
+		2 - On Time of 0.625s and Period of 2.5s
+		3 - On Time of 0.156s and Period of 2.5s

Documentation/devicetree/bindings/leds/leds-ltc3220.yaml

@@ -0,0 +1,114 @@
+# 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@analog.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
+
+patternProperties:
+  "(^led@([1-9]|1[0-8])$|led)":
+    type: object
+    $ref: common.yaml#
+    unevaluatedProperties: false
+    properties:
+      reg:
+        description: Output channel for the LED. reg value to output to LED output number
+        enum:
+          - 1  # LED output D1
+          - 2  # LED output D2
+          - 3  # LED output D3
+          - 4  # LED output D4
+          - 5  # LED output D5
+          - 6  # LED output D6
+          - 7  # LED output D7
+          - 8  # LED output D8
+          - 9  # LED output D9
+          - 10 # LED output D10
+          - 11 # LED output D11
+          - 12 # LED output D12
+          - 13 # LED output D13
+          - 14 # LED output D14
+          - 15 # LED output D15
+          - 16 # LED output D16
+          - 17 # LED output D17
+          - 18 # LED output D18
+    required:
+      - reg
+
+required:
+  - compatible
+  - reg
+  - reset-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+   #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 0>;
+
+             led@1 {
+                 reg = <1>;
+             };
+
+             led@2 {
+                 reg = <2>;
+             };
+
+             led@3 {
+                 reg = <3>;
+             };
+
+             led@4 {
+                 reg = <4>;
+             };
+
+             led@5 {
+                 reg = <5>;
+             };
+
+             led@6 {
+                 reg = <6>;
+             };
+        };
+    };
+
+...

Kconfig.adi

@@ -71,6 +71,7 @@ config KERNEL_ALL_ADI_DRIVERS
 	imply PMIC_ADP5520
 	imply PWM_AXI_PWMGEN
 	imply LEDS_ADP5520
+	imply LEDS_LTC3220
 	imply BACKLIGHT_ADP5520
 	imply BACKLIGHT_ADP8860
 	imply BACKLIGHT_ADP8870

drivers/leds/Kconfig

@@ -931,6 +931,16 @@ config LEDS_LM36274
 	  Say Y to enable the LM36274 LED driver for TI LMU devices.
 	  This supports the LED device LM36274.
 
+config LEDS_LTC3220
+	tristate "LED Driver for LTC3220/LTC3220-1"
+	depends on I2C && LEDS_CLASS
+	help
+	  If you have an 18-Channel LED Driver connected to LTC3220, or LTC3220-1
+	  say Y here to enable this driver.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called ltc3220.
+
 config LEDS_TPS6105X
 	tristate "LED support for TI TPS6105X"
 	depends on LEDS_CLASS

drivers/leds/Makefile

@@ -58,6 +58,7 @@ obj-$(CONFIG_LEDS_LP8501)		+= leds-lp8501.o
 obj-$(CONFIG_LEDS_LP8788)		+= leds-lp8788.o
 obj-$(CONFIG_LEDS_LP8860)		+= leds-lp8860.o
 obj-$(CONFIG_LEDS_LT3593)		+= leds-lt3593.o
+obj-$(CONFIG_LEDS_LTC3220)		+= leds-ltc3220.o
 obj-$(CONFIG_LEDS_MAX5970)		+= leds-max5970.o
 obj-$(CONFIG_LEDS_MAX77650)		+= leds-max77650.o
 obj-$(CONFIG_LEDS_MAX8997)		+= leds-max8997.o