[PATCH v4 0/2] Add support for LTC3208 multi-display driver

[PATCH v4 0/2] Add support for LTC3208 multi-display driver

[Jan Carlo Roleda]

The LTC3208 is a multi-display LED driver, using a high-efficiency, low
noise charge pump to provide power to 5 channels (MAIN, SUB, RGB, CAM,
AUX). Current for each LED is controlled by the I2C serial interface.
Four AUX current sources can be independently assigned via the I2C port
to the CAM, SUB, MAIN, or AUX DAC controlled displays

Signed-off-by: Jan Carlo Roleda <jancarlo.roleda@analog.com>
---
Changes in v4:
- Reordered commit order to match dependency order
- Updated Kconfig to be more descriptive of device
- Added led@0-7 with more complete example properties (function and
  color)
- Driver changes:
-- Removed unnecessary include headers
-- Formatted macros
-- Created helper `write_current_level` functions for LED current
  configuration, using `regmap_update_bits()`
-- Adjusted awkward tabbing issues
-- Updated variable names in probe to be more descriptive
-- Updated inline comment capitalization
-- Initialized `i` within the for loop in AUX configuration in probe
-- Refactored `update_aux_dac` function to use array pointer
-- Fixed error messages in probe 
- Link to v3: https://lore.kernel.org/r/20260406-upstream-ltc3208-v3-0-7f0b1d20ee7a@analog.com

Changes in v3:
- Edited device bindings descriptions
-- removed full stop in title
-- replaced quotes with double quotes for consistency
-- removed <dt-bindings/gpio/gpio.h> from example
-- removed led1-7 in example for brevity
- squashed maintainers commit to driver commit
- Link to v2: https://lore.kernel.org/r/20260326-upstream-ltc3208-v2-0-3dbc992b6098@analog.com

Changes in v2:
- Addressed DTSchema bot warnings and errors
-- removed extra blank lines
-- fixed $id to match current naming
- Addressed Kernel test warnings
-- fixed bounds for aux channel configurations
- Link to v0: https://lore.kernel.org/r/20260318-upstream-ltc3208-v1-0-015f1f1e9065@analog.com

---
Jan Carlo Roleda (2):
      dt-bindings: leds: Document LTC3208 Multidisplay LED Driver
      leds: ltc3208: Add driver for LTC3208 Multidisplay LED Driver

 .../devicetree/bindings/leds/adi,ltc3208.yaml      | 181 ++++++++++++++
 MAINTAINERS                                        |   7 +
 drivers/leds/Kconfig                               |  12 +
 drivers/leds/Makefile                              |   1 +
 drivers/leds/leds-ltc3208.c                        | 278 +++++++++++++++++++++
 5 files changed, 479 insertions(+)
---
base-commit: e68f95a51d1a8c1594b536c4d495cbea38d47561
change-id: 20260318-upstream-ltc3208-7cc8968bf69e

Best regards,
-- 
Jan Carlo Roleda <jancarlo.roleda@analog.com>

[PATCH v4 1/2] dt-bindings: leds: Document LTC3208 Multidisplay LED Driver

[Jan Carlo Roleda]

Add Devicetree Documentation for LTC3208 Multidisplay LED Driver.

Signed-off-by: Jan Carlo Roleda <jancarlo.roleda@analog.com>
---
 .../devicetree/bindings/leds/adi,ltc3208.yaml      | 181 +++++++++++++++++++++
 MAINTAINERS                                        |   7 +
 2 files changed, 188 insertions(+)

diff --git a/Documentation/devicetree/bindings/leds/adi,ltc3208.yaml b/Documentation/devicetree/bindings/leds/adi,ltc3208.yaml
new file mode 100644
index 000000000000..0a01e07e0ab7
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/adi,ltc3208.yaml
@@ -0,0 +1,181 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (c) 2026 Analog Devices, Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/adi,ltc3208.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LTC3208 Multidisplay LED Controller from Linear Technologies (Now Analog Devices)
+
+maintainers:
+  - Jan Carlo Roleda <jancarlo.roleda@analog.com>
+
+description:
+  The LTC3208 is a multidisplay LED controller that can support up to 1A to all
+  connected LEDs.
+
+  The datasheet for this device can be found in
+  https://www.analog.com/en/products/ltc3208.html
+
+properties:
+  compatible:
+    const: adi,ltc3208
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  adi,disable-camhl-pin:
+    type: boolean
+    description:
+      Configures whether the external CAMHL pin is disabled.
+      If disabled then the output pins associated with CAM will always select
+      the CAM register's high half-byte brightness.
+
+  adi,cfg-enrgbs-pin:
+    type: boolean
+    description:
+      Configures which channel the ENRGBS pin toggles when it receives a signal.
+      ENRGBS pin controls the SUB channel's output pins if this is set,
+      or RGB channel's output pins if this is unset.
+
+  adi,disable-rgb-aux4-dropout:
+    type: boolean
+    description:
+      Configures the RGB and AUX4 dropout signals to be disabled.
+
+  adi,aux1-channel:
+    $ref: /schemas/types.yaml#/definitions/string
+    description:
+      LED Channel that the AUX1 output pin mirrors its brightness level from.
+    enum: [aux, main, sub, cam]
+    default: aux
+
+  adi,aux2-channel:
+    $ref: /schemas/types.yaml#/definitions/string
+    description:
+      LED Channel that the AUX2 output pin mirrors its brightness level from.
+    enum: [aux, main, sub, cam]
+    default: aux
+
+  adi,aux3-channel:
+    $ref: /schemas/types.yaml#/definitions/string
+    description:
+      LED Channel that the AUX3 output pin mirrors its brightness level from.
+    enum: [aux, main, sub, cam]
+    default: aux
+
+  adi,aux4-channel:
+    $ref: /schemas/types.yaml#/definitions/string
+    description:
+      LED Channel that the AUX4 output pin mirrors its brightness level from.
+    enum: [aux, main, sub, cam]
+    default: aux
+
+patternProperties:
+  "^led@[0-7]$":
+    type: object
+    $ref: /schemas/leds/common.yaml#
+    unevaluatedProperties: false
+    properties:
+      reg:
+        description:
+          LED Channel Number. each channel maps to a specific channel group used
+          to configure the brightness level of the output pins corresponding to
+          the channel.
+        enum:
+          - 0 # Main Channel (8-bit brightness)
+          - 1 # Sub Channel (8-bit brightness)
+          - 2 # AUX Channel (4-bit brightness)
+          - 3 # Camera Channel, Low-side byte (4-bit brightness)
+          - 4 # Camera Channel, High-side byte (4-bit brightness)
+          - 5 # Red Channel (4-bit brightness)
+          - 6 # Blue Channel (4-bit brightness)
+          - 7 # Green Channel (4-bit brightness)
+    required:
+      - reg
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/leds/common.h>
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      led-controller@1b {
+        compatible = "adi,ltc3208";
+        reg = <0x1b>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        adi,disable-camhl-pin;
+        adi,cfg-enrgbs-pin;
+        adi,disable-rgb-aux4-dropout;
+
+        /* MAIN */
+        led@0 {
+          reg = <0>;
+          function = LED_FUNCTION_ACTIVITY;
+          color = <LED_COLOR_ID_WHITE>;
+        };
+
+        /* SUB */
+        led@1 {
+          reg = <1>;
+          function = LED_FUNCTION_ACTIVITY;
+          color = <LED_COLOR_ID_WHITE>;
+        };
+
+        /* AUX */
+        led@2 {
+          reg = <2>;
+          function = LED_FUNCTION_ACTIVITY;
+          color = <LED_COLOR_ID_WHITE>;
+        };
+
+        /* CAMLO */
+        led@3 {
+          reg = <3>;
+          function = LED_FUNCTION_FLASH;
+          color = <LED_COLOR_ID_WHITE>;
+        };
+
+        /* CAMHI */
+        led@4 {
+          reg = <4>;
+          function = LED_FUNCTION_FLASH;
+          color = <LED_COLOR_ID_WHITE>;
+        };
+
+        /* RED */
+        led@5 {
+          reg = <5>;
+          function = LED_FUNCTION_INDICATOR;
+          color = <LED_COLOR_ID_RED>;
+        };
+
+        /* BLUE */
+        led@6 {
+          reg = <6>;
+          function = LED_FUNCTION_INDICATOR;
+          color = <LED_COLOR_ID_BLUE>;
+        };
+
+        /* GREEN */
+        led@7 {
+          reg = <7>;
+          function = LED_FUNCTION_INDICATOR;
+          color = <LED_COLOR_ID_GREEN>;
+        };
+      };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 55af015174a5..19b0b84e934d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15126,6 +15126,13 @@ W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
 F:	drivers/iio/temperature/ltc2983.c
 
+LTC3208 LED DRIVER
+M:	Jan Carlo Roleda <jancarlo.roleda@analog.com>
+L:	linux-leds@vger.kernel.org
+S:	Maintained
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/leds/adi,ltc3208.yaml
+
 LTC4282 HARDWARE MONITOR DRIVER
 M:	Nuno Sa <nuno.sa@analog.com>
 L:	linux-hwmon@vger.kernel.org

-- 
2.43.0

[PATCH v4 2/2] leds: ltc3208: Add driver for LTC3208 Multidisplay LED Driver

[Jan Carlo Roleda]

Kernel driver implementation for LTC3208 Multidisplay LED Driver.

The LTC3208 is a Multi-display LED driver, designed to control up to
7 distinct LED channels (MAIN, SUB, AUX, CAMHI, CAMLO, RED, GREEN, BLUE),
each configurable with its own current level that is equally set to its
respective output current source pins for external LEDs.

It is programmed via the I2C serial interface.
MAIN and SUB support 8-bit current level resolution,
while AUX, CAMHI/LO, RED, GREEN, and BLUE support 4-bit levels.

The AUX LED channel can be configured to mirror the CAM, SUB, and MAIN
channel current levels, or as its own independent AUX channel.

The CAM LED channel is configured as 2 separate CAMHI and CAMLO register
sub-channels, which currnet is selected via the CAMHL pin, or set to
CAMHI register only via setting the S_CAMHILO bit high in register G (0x7).

Signed-off-by: Jan Carlo Roleda <jancarlo.roleda@analog.com>
---
 MAINTAINERS                 |   2 +-
 drivers/leds/Kconfig        |  12 ++
 drivers/leds/Makefile       |   1 +
 drivers/leds/leds-ltc3208.c | 278 ++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 292 insertions(+), 1 deletion(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index 19b0b84e934d..48bae02057d5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15131,7 +15131,7 @@ M:	Jan Carlo Roleda <jancarlo.roleda@analog.com>
 L:	linux-leds@vger.kernel.org
 S:	Maintained
 W:	https://ez.analog.com/linux-software-drivers
-F:	Documentation/devicetree/bindings/leds/adi,ltc3208.yaml
+F:	drivers/leds/leds-ltc3208.c
 
 LTC4282 HARDWARE MONITOR DRIVER
 M:	Nuno Sa <nuno.sa@analog.com>
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 597d7a79c988..d13bbec73f06 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -1029,6 +1029,18 @@ config LEDS_ACER_A500
 	  This option enables support for the Power Button LED of
 	  Acer Iconia Tab A500.
 
+config LEDS_LTC3208
+	tristate "LED Driver for Analog Devices LTC3208"
+	depends on LEDS_CLASS && I2C
+	select REGMAP_I2C
+	help
+	  Say Y to enable the LTC3208 LED driver.
+	  This enables the LED device LTC3208, a 7-channel, 17-current source
+	  multidisplay high-current LED driver, configured via I2C.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called ltc3208.
+
 source "drivers/leds/blink/Kconfig"
 
 comment "Flash and Torch LED drivers"
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 8fdb45d5b439..b08b539112b6 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -61,6 +61,7 @@ obj-$(CONFIG_LEDS_LP8788)		+= leds-lp8788.o
 obj-$(CONFIG_LEDS_LP8860)		+= leds-lp8860.o
 obj-$(CONFIG_LEDS_LP8864)		+= leds-lp8864.o
 obj-$(CONFIG_LEDS_LT3593)		+= leds-lt3593.o
+obj-$(CONFIG_LEDS_LTC3208)		+= leds-ltc3208.o
 obj-$(CONFIG_LEDS_MAX5970)		+= leds-max5970.o
 obj-$(CONFIG_LEDS_MAX77650)		+= leds-max77650.o
 obj-$(CONFIG_LEDS_MAX77705)		+= leds-max77705.o
diff --git a/drivers/leds/leds-ltc3208.c b/drivers/leds/leds-ltc3208.c
new file mode 100644
index 000000000000..9da8f4b359e3
--- /dev/null
+++ b/drivers/leds/leds-ltc3208.c
@@ -0,0 +1,278 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * LED driver for Analog Devices LTC3208 Multi-Display Driver
+ *
+ * Copyright 2026 Analog Devices Inc.
+ *
+ * Author: Jan Carlo Roleda <jancarlo.roleda@analog.com>
+ */
+#include <linux/bitfield.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+
+#define LTC3208_LED_SET_HIGH_BYTE_DATA	GENMASK(7, 4)
+#define LTC3208_LED_SET_LOW_BYTE_DATA	GENMASK(3, 0)
+
+/* Registers */
+#define LTC3208_REG_A_GRNRED		0x1 /* Green (High half-byte) */
+					/* and Red (Low half-byte) current DAC*/
+#define LTC3208_REG_B_AUXBLU		0x2 /* AUX (High half-byte) */
+					/* and Blue (Low half-byte) current DAC*/
+#define LTC3208_REG_C_MAIN		0x3 /* Main current DAC */
+#define LTC3208_REG_D_SUB		0x4 /* Sub current DAC */
+#define LTC3208_REG_E_AUX_SELECT	0x5 /* AUX DAC Select */
+#define  LTC3208_AUX1_MASK		GENMASK(1, 0)
+#define  LTC3208_AUX2_MASK		GENMASK(3, 2)
+#define  LTC3208_AUX3_MASK		GENMASK(5, 4)
+#define  LTC3208_AUX4_MASK		GENMASK(7, 6)
+#define LTC3208_REG_F_CAM		0x6 /* CAM (High half-byte and Low half-byte) current DAC*/
+#define LTC3208_REG_G_OPT		0x7 /* Device Options */
+#define  LTC3208_OPT_CPO_MASK		GENMASK(7, 6)
+#define  LTC3208_OPT_DIS_RGBDROP	BIT(3)
+#define  LTC3208_OPT_DIS_CAMHILO	BIT(2)
+#define  LTC3208_OPT_EN_RGBS		BIT(1)
+
+#define LTC3208_MAX_BRIGHTNESS_4BIT	0xF
+#define LTC3208_MAX_BRIGHTNESS_8BIT	0xFF
+
+#define LTC3208_NUM_LED_GRPS		8
+#define LTC3208_NUM_AUX_LEDS		4
+
+#define LTC3208_NUM_AUX_OPT		4
+#define LTC3208_MAX_CPO_OPT		3
+
+enum ltc3208_aux_channel {
+	LTC3208_AUX_CHAN_AUX = 0,
+	LTC3208_AUX_CHAN_MAIN,
+	LTC3208_AUX_CHAN_SUB,
+	LTC3208_AUX_CHAN_CAM
+};
+
+enum ltc3208_channel {
+	LTC3208_CHAN_MAIN = 0,
+	LTC3208_CHAN_SUB,
+	LTC3208_CHAN_AUX,
+	LTC3208_CHAN_CAML,
+	LTC3208_CHAN_CAMH,
+	LTC3208_CHAN_RED,
+	LTC3208_CHAN_BLUE,
+	LTC3208_CHAN_GREEN
+};
+
+static const char * const ltc3208_dt_aux_channels[] = {
+	"adi,aux1-channel", "adi,aux2-channel",
+	"adi,aux3-channel", "adi,aux4-channel"
+};
+
+static const char * const ltc3208_aux_opt[] = {
+	"aux", "main", "sub", "cam"
+};
+
+struct ltc3208_led {
+	struct led_classdev cdev;
+	struct i2c_client *client;
+	enum ltc3208_channel channel;
+};
+
+struct ltc3208_dev {
+	struct i2c_client *client;
+	struct regmap *map;
+	struct ltc3208_led *leds;
+};
+
+static const struct regmap_config ltc3208_regmap_cfg = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int ltc3208_led_set_current_low(struct regmap *regmap, u8 reg, u8 level)
+{
+	return regmap_update_bits(regmap, reg, LTC3208_LED_SET_LOW_BYTE_DATA, level);
+}
+
+static int ltc3208_led_set_current_high(struct regmap *regmap, u8 reg, u8 level)
+{
+	return regmap_update_bits(regmap, reg, LTC3208_LED_SET_HIGH_BYTE_DATA, level);
+}
+
+static int ltc3208_led_set_brightness(struct led_classdev *led_cdev, enum led_brightness brightness)
+{
+	struct ltc3208_led *led = container_of(led_cdev, struct ltc3208_led, cdev);
+	struct i2c_client *client = led->client;
+	struct ltc3208_dev *dev = i2c_get_clientdata(client);
+	struct regmap *regmap = dev->map;
+	u8 current_level = brightness;
+
+	switch (led->channel) {
+	case LTC3208_CHAN_MAIN:
+		return regmap_write(regmap, LTC3208_REG_C_MAIN, current_level);
+	case LTC3208_CHAN_SUB:
+		return regmap_write(regmap, LTC3208_REG_D_SUB, current_level);
+	case LTC3208_CHAN_AUX:
+		return ltc3208_led_set_current_high(regmap, LTC3208_REG_B_AUXBLU, current_level);
+	case LTC3208_CHAN_BLUE:
+		return ltc3208_led_set_current_low(regmap, LTC3208_REG_B_AUXBLU, current_level);
+	case LTC3208_CHAN_CAMH:
+		return ltc3208_led_set_current_high(regmap, LTC3208_REG_F_CAM, current_level);
+	case LTC3208_CHAN_CAML:
+		return ltc3208_led_set_current_low(regmap, LTC3208_REG_F_CAM, current_level);
+	case LTC3208_CHAN_GREEN:
+		return ltc3208_led_set_current_high(regmap, LTC3208_REG_A_GRNRED, current_level);
+	case LTC3208_CHAN_RED:
+		return ltc3208_led_set_current_low(regmap, LTC3208_REG_A_GRNRED, current_level);
+	default:
+		dev_err(&client->dev, "Invalid LED Channel\n");
+		return -EINVAL;
+	}
+}
+
+static int ltc3208_update_options(struct ltc3208_dev *dev,
+				  bool is_sub, bool is_cam_hi, bool is_rgb_drop)
+{
+	struct regmap *map = dev->map;
+	u8 val;
+
+	val =	FIELD_PREP(LTC3208_OPT_EN_RGBS, is_sub) |
+		FIELD_PREP(LTC3208_OPT_DIS_CAMHILO, is_cam_hi) |
+		FIELD_PREP(LTC3208_OPT_DIS_RGBDROP, is_rgb_drop);
+
+	return regmap_write(map, LTC3208_REG_G_OPT, val);
+}
+
+static int ltc3208_update_aux_dac(struct ltc3208_dev *dev, enum ltc3208_aux_channel *aux_chan)
+{
+	struct regmap *map = dev->map;
+	u8 val;
+
+	val =	FIELD_PREP(LTC3208_AUX1_MASK, aux_chan[0]) |
+		FIELD_PREP(LTC3208_AUX2_MASK, aux_chan[1]) |
+		FIELD_PREP(LTC3208_AUX3_MASK, aux_chan[2]) |
+		FIELD_PREP(LTC3208_AUX4_MASK, aux_chan[3]);
+
+	return regmap_write(map, LTC3208_REG_E_AUX_SELECT, val);
+}
+
+static int ltc3208_probe(struct i2c_client *client)
+{
+	enum ltc3208_aux_channel aux_channels[LTC3208_NUM_AUX_LEDS];
+	struct ltc3208_dev *dev_data;
+	struct ltc3208_led *leds;
+	struct regmap *regmap;
+	int ret;
+	u32 val;
+	bool dropdis_rgb_aux4;
+	bool dis_camhl;
+	bool en_rgbs;
+
+	regmap = devm_regmap_init_i2c(client, &ltc3208_regmap_cfg);
+	if (IS_ERR(regmap))
+		return dev_err_probe(&client->dev, PTR_ERR(regmap),
+				     "Failed to initialize regmap\n");
+
+	dev_data = devm_kzalloc(&client->dev, sizeof(*dev_data), GFP_KERNEL);
+	if (!dev_data)
+		return -ENOMEM;
+
+	leds = devm_kcalloc(&client->dev, LTC3208_NUM_LED_GRPS,
+			    sizeof(struct ltc3208_led), GFP_KERNEL);
+	if (!leds)
+		return -ENOMEM;
+
+	dev_data->client = client;
+	dev_data->map = regmap;
+
+	dis_camhl = device_property_read_bool(&client->dev, "adi,disable-camhl-pin");
+	en_rgbs = device_property_read_bool(&client->dev, "adi,cfg-enrgbs-pin");
+	dropdis_rgb_aux4 = device_property_read_bool(&client->dev, "adi,disable-rgb-aux4-dropout");
+
+	ret = ltc3208_update_options(dev_data, en_rgbs, dis_camhl,
+				     dropdis_rgb_aux4);
+	if (ret)
+		return dev_err_probe(&client->dev, ret, "error writing to options register\n");
+
+	/* Initialize aux channel configurations from devicetree */
+	for (int i = 0; i < LTC3208_NUM_AUX_LEDS; i++) {
+		ret = device_property_match_property_string(&client->dev,
+							    ltc3208_dt_aux_channels[i],
+							    ltc3208_aux_opt,
+							    LTC3208_NUM_AUX_OPT);
+		/* Use default value if absent in devicetree */
+		if (ret == -EINVAL)
+			aux_channels[i] = LTC3208_AUX_CHAN_AUX;
+		else if (ret >= 0)
+			aux_channels[i] = ret;
+		else
+			return dev_err_probe(&client->dev, ret,
+					     "Failed getting aux-channel %d\n", i);
+	}
+
+	ret = ltc3208_update_aux_dac(dev_data, aux_channels);
+	if (ret)
+		return dev_err_probe(&client->dev, ret, "error writing to aux channel register.\n");
+
+	i2c_set_clientdata(client, dev_data);
+
+	device_for_each_child_node_scoped(&client->dev, child) {
+		struct ltc3208_led *led;
+		struct led_init_data init_data = {};
+
+		ret = fwnode_property_read_u32(child, "reg", &val);
+		if (ret)
+			return dev_err_probe(&client->dev, -EINVAL,
+					     "Failed to get reg value of LED.\n");
+		else if (val >= LTC3208_NUM_LED_GRPS)
+			return dev_err_probe(&client->dev, -EINVAL,
+					     "LED reg value not supported.\n");
+
+		led = &leds[val];
+		led->client = client;
+		led->channel = val;
+		led->cdev.brightness_set_blocking = ltc3208_led_set_brightness;
+		led->cdev.max_brightness = LTC3208_MAX_BRIGHTNESS_4BIT;
+		if (val == LTC3208_CHAN_MAIN || val == LTC3208_CHAN_SUB)
+			led->cdev.max_brightness = LTC3208_MAX_BRIGHTNESS_8BIT;
+
+		init_data.fwnode = child;
+
+		ret = devm_led_classdev_register_ext(&client->dev, &led->cdev,
+			&init_data);
+		if (ret)
+			return dev_err_probe(&client->dev, ret, "Failed to register LED %u\n", val);
+	}
+
+	dev_data->leds = leds;
+
+	return 0;
+}
+
+static const struct of_device_id ltc3208_match_table[] = {
+	{.compatible = "adi,ltc3208"},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ltc3208_match_table);
+
+static const struct i2c_device_id ltc3208_idtable[] = {
+	{ "ltc3208" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ltc3208_idtable);
+
+static struct i2c_driver ltc3208_driver = {
+	.driver = {
+		.name = "ltc3208",
+		.of_match_table = ltc3208_match_table,
+	},
+	.id_table = ltc3208_idtable,
+	.probe = ltc3208_probe,
+};
+module_i2c_driver(ltc3208_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jan Carlo Roleda <jancarlo.roleda@analog.com>");
+MODULE_DESCRIPTION("LTC3208 LED Driver");

-- 
2.43.0

Re: [PATCH v4 1/2] dt-bindings: leds: Document LTC3208 Multidisplay LED Driver

[Krzysztof Kozlowski]

On Thu, Apr 16, 2026 at 10:39:06AM +0800, Jan Carlo Roleda wrote:
> Add Devicetree Documentation for LTC3208 Multidisplay LED Driver.
> 
> Signed-off-by: Jan Carlo Roleda <jancarlo.roleda@analog.com>
> ---
>  .../devicetree/bindings/leds/adi,ltc3208.yaml      | 181 +++++++++++++++++++++
>  MAINTAINERS                                        |   7 +
>  2 files changed, 188 insertions(+)

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

Best regards,
Krzysztof