docs: leds: Document TI LP5812 LED driver

The driver provides sysfs interfaces to control and configure the
LP5812 device and its LED channels.

The documentation describes the chip's capabilities, sysfs interface,
and usage examples.

Signed-off-by: Nam Tran <trannamatk@gmail.com>
Link: https://patch.msgid.link/20260115161013.40706-3-trannamatk@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>

Documentation/leds/index.rst

@@ -25,6 +25,7 @@ LEDs
    leds-lp5523
    leds-lp5562
    leds-lp55xx
+   leds-lp5812
    leds-mlxcpld
    leds-mt6370-rgb
    leds-sc27xx

Documentation/leds/leds-lp5812.rst

@@ -0,0 +1,50 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+========================
+Kernel driver for lp5812
+========================
+
+* TI/National Semiconductor LP5812 LED Driver
+* Datasheet: https://www.ti.com/product/LP5812#tech-docs
+
+Authors: Jared Zhou <jared-zhou@ti.com>
+
+Description
+===========
+
+The LP5812 is a 4x3 matrix LED driver with support for both manual and
+autonomous animation control. This driver provides sysfs interfaces to
+control and configure the LP5812 device and its LED channels.
+
+Sysfs Interface
+===============
+
+This driver uses the standard multicolor LED class interfaces defined
+in Documentation/ABI/testing/sysfs-class-led-multicolor.rst.
+
+Each LP5812 LED output appears under ``/sys/class/leds/`` with its
+assigned label (for example ``LED_A``).
+
+The following attributes are exposed:
+  - multi_intensity: Per-channel RGB intensity control
+  - brightness: Standard brightness control (0-255)
+
+Autonomous Control Modes
+========================
+
+The driver also supports autonomous control through pattern configuration
+(e.g., direct, tcmscan, or mixscan modes) defined in the device tree.
+When configured, the LP5812 can generate transitions and color effects
+without CPU intervention.
+
+Refer to the device tree binding document for valid mode strings and
+configuration examples.
+
+Example Usage
+=============
+
+To control LED_A::
+    # Set RGB intensity (R=50, G=50, B=50)
+    echo 50 50 50 > /sys/class/leds/LED_A/multi_intensity
+    # Set overall brightness to maximum
+    echo 255 > /sys/class/leds/LED_A/brightness

MAINTAINERS

@@ -25841,6 +25841,7 @@ M:	Nam Tran <trannamatk@gmail.com>
 L:	linux-leds@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/leds/ti,lp5812.yaml
+F:	Documentation/leds/leds-lp5812.rst
 F:	drivers/leds/rgb/Kconfig
 F:	drivers/leds/rgb/Makefile
 F:	drivers/leds/rgb/leds-lp5812.c