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[PATCH] backlight: Add TI LMU backlight driver




This is consolidated driver which supports backlight devices below.
  LM3532, LM3631, LM3632, LM3633, LM3695 and LM3697.

Structure
---------
  It consists of two parts - core and data.

  Core part supports features below.
    - Backlight subsystem control
    - Channel configuration from DT properties
    - Light dimming effect control: ramp up and down.
    - LMU fault monitor notifier handling
    - PWM brightness control

  Data part describes device specific data.
    - Register value configuration for each LMU device
      : initialization, channel configuration, control mode, enable and
        brightness.
    - PWM action configuration
    - Light dimming effect table
    - Option for LMU fault monitor support

Macros for register data
------------------------
  All LMU devices have 8-bit based registers. LMU_BL_REG() creates 24-bit
  register value in data part. It consists of address, mask and value.
  On the other hand, register value should be parsed when the driver
  reads/writes data from/to I2C registers. Driver uses LMU_BL_GET_ADDR(),
  LMU_BL_GET_MASK() and LMU_BL_GET_VAL() for this purpose.

Data structure
--------------
  ti_lmu_bl:         Backlight output channel data
  ti_lmu_bl_chip:    Backlight device data. One device can have multiple
                     backlight channel data.
  ti_lmu_bl_reg:     Backlight device register data
  ti_lmu_bl_cfg:     Backlight configuration data for each LMU device

Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Sebastian Reichel <sre@xxxxxxxxxx>
Cc: Tony Lindgren <tony@xxxxxxxxxxx>
Signed-off-by: Milo Kim <milo.kim@xxxxxx>
---
 .../bindings/leds/backlight/ti-lmu-backlight.txt   |  65 ++
 drivers/video/backlight/Kconfig                    |   7 +
 drivers/video/backlight/Makefile                   |   3 +
 drivers/video/backlight/ti-lmu-backlight-core.c    | 655 +++++++++++++++++++++
 drivers/video/backlight/ti-lmu-backlight-data.c    | 287 +++++++++
 include/linux/mfd/ti-lmu-backlight.h               | 290 +++++++++
 6 files changed, 1307 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/backlight/ti-lmu-backlight.txt
 create mode 100644 drivers/video/backlight/ti-lmu-backlight-core.c
 create mode 100644 drivers/video/backlight/ti-lmu-backlight-data.c
 create mode 100644 include/linux/mfd/ti-lmu-backlight.h

diff --git a/Documentation/devicetree/bindings/leds/backlight/ti-lmu-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/ti-lmu-backlight.txt
new file mode 100644
index 000000000000..c2c35b293716
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/backlight/ti-lmu-backlight.txt
@@ -0,0 +1,65 @@
+TI LMU backlight device tree bindings
+
+Required property:
+  - compatible: Should be one of:
+                "ti,lm3532-backlight"
+                "ti,lm3631-backlight"
+                "ti,lm3632-backlight"
+                "ti,lm3633-backlight"
+                "ti,lm3695-backlight"
+                "ti,lm3697-backlight"
+
+Optional properties:
+  There are two backlight control mode. One is I2C, the other is PWM mode.
+  Following properties are only specified in PWM mode.
+  Please note that LMU backlight device can have only one PWM channel.
+
+  - pwms: OF device-tree PWM specification.
+  - pwm-names: a list of names for the PWM devices specified in the "pwms"
+               property.
+
+  For the PWM user nodes, please refer to [1].
+
+Child nodes:
+  LMU backlight is represented as sub-nodes of the TI LMU device [2].
+  So, LMU backlight should have more than one backlight child node.
+  Each node exactly matches with backlight control bank configuration.
+  Maximum numbers of child nodes depend on the device.
+  1 = LM3631, LM3632, LM3695
+  2 = LM3633, LM3697
+  3 = LM3532
+
+  Required property of a child node:
+  - led-sources: List of enabled channels from 0 to 2.
+                 Please refer to LED binding [3].
+                 For output channels, please refer to the datasheets [4].
+
+  Optional properties of a child node:
+  - label: Backlight channel identification.
+           Please refer to LED binding [3].
+  - default-brightness-level: Backlight initial brightness value.
+                              Type is <u32>. It is set as soon as backlight
+                              device is created.
+                              0 ~ 2047 = LM3631, LM3632, LM3633, LM3695 and
+                                         LM3697
+                              0 ~ 255  = LM3532
+  - ramp-up-msec, ramp-down-msec: Light dimming effect properties.
+                                  Type is <u32>. Unit is millisecond.
+                                  0 ~ 65 msec    = LM3532
+                                  0 ~ 4000 msec  = LM3631
+                                  0 ~ 16000 msec = LM3633 and LM3697
+  - pwm-period: PWM period. Only valid in PWM brightness mode.
+                Type is <u32>. If this property is missing, then control
+                mode is set to I2C by default.
+
+Examples: Please refer to ti-lmu dt-bindings. [2].
+
+[1] ../pwm/pwm.txt
+[2] ../mfd/ti-lmu.txt
+[3] ../leds/common.txt
+[4] LM3532: http://www.ti.com/product/LM3532/datasheet
+    LM3631: http://www.ti.com/product/LM3631/datasheet
+    LM3632: http://www.ti.com/product/LM3632A/datasheet
+    LM3633: http://www.ti.com/product/LM3633/datasheet
+    LM3695: Datasheet is not opened yet, but only two strings are used.
+    LM3697: http://www.ti.com/product/LM3697/datasheet
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 5ffa4b4e26c0..451d04315810 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -427,6 +427,13 @@ config BACKLIGHT_SKY81452
 	  To compile this driver as a module, choose M here: the module will
 	  be called sky81452-backlight
 
+config BACKLIGHT_TI_LMU
+	tristate "Backlight driver for TI LMU"
+	depends on BACKLIGHT_CLASS_DEVICE && MFD_TI_LMU
+	help
+	  Say Y to enable the backlight driver for TI LMU devices.
+	  This supports LM3532, LM3631, LM3632, LM3633, LM3695 and LM3697.
+
 config BACKLIGHT_TPS65217
 	tristate "TPS65217 Backlight"
 	depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 16ec534cff30..0f74ce7d1e36 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -52,6 +52,9 @@ obj-$(CONFIG_BACKLIGHT_PM8941_WLED)	+= pm8941-wled.o
 obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
 obj-$(CONFIG_BACKLIGHT_SAHARA)		+= kb3886_bl.o
 obj-$(CONFIG_BACKLIGHT_SKY81452)	+= sky81452-backlight.o
+ti-lmu-backlight-objs			:= ti-lmu-backlight-core.o \
+					   ti-lmu-backlight-data.o
+obj-$(CONFIG_BACKLIGHT_TI_LMU)		+= ti-lmu-backlight.o
 obj-$(CONFIG_BACKLIGHT_TOSA)		+= tosa_bl.o
 obj-$(CONFIG_BACKLIGHT_TPS65217)	+= tps65217_bl.o
 obj-$(CONFIG_BACKLIGHT_WM831X)		+= wm831x_bl.o
diff --git a/drivers/video/backlight/ti-lmu-backlight-core.c b/drivers/video/backlight/ti-lmu-backlight-core.c
new file mode 100644
index 000000000000..cff2908a3663
--- /dev/null
+++ b/drivers/video/backlight/ti-lmu-backlight-core.c
@@ -0,0 +1,655 @@
+/*
+ * TI LMU (Lighting Management Unit) Backlight Driver
+ *
+ * Copyright 2017 Texas Instruments
+ *
+ * Author: Milo Kim <milo.kim@xxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/backlight.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/mfd/ti-lmu.h>
+#include <linux/mfd/ti-lmu-backlight.h>
+#include <linux/mfd/ti-lmu-register.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/slab.h>
+
+#define NUM_DUAL_CHANNEL			2
+#define LMU_BACKLIGHT_DUAL_CHANNEL_USED		(BIT(0) | BIT(1))
+#define LMU_BACKLIGHT_11BIT_LSB_MASK		(BIT(0) | BIT(1) | BIT(2))
+#define LMU_BACKLIGHT_11BIT_MSB_SHIFT		3
+#define DEFAULT_PWM_NAME			"lmu-backlight"
+
+static int ti_lmu_backlight_enable(struct ti_lmu_bl *lmu_bl, int enable)
+{
+	struct ti_lmu_bl_chip *chip = lmu_bl->chip;
+	struct regmap *regmap = chip->lmu->regmap;
+	unsigned long enable_time = chip->cfg->reginfo->enable_usec;
+	u8 *reg = chip->cfg->reginfo->enable;
+	u8 mask = BIT(lmu_bl->bank_id);
+
+	if (!reg)
+		return -EINVAL;
+
+	if (enable)
+		return regmap_update_bits(regmap, *reg, mask, mask);
+	else
+		return regmap_update_bits(regmap, *reg, mask, 0);
+
+	if (enable_time > 0)
+		usleep_range(enable_time, enable_time + 100);
+}
+
+static void ti_lmu_backlight_pwm_ctrl(struct ti_lmu_bl *lmu_bl, int brightness,
+				      int max_brightness)
+{
+	struct pwm_device *pwm;
+	unsigned int duty, period;
+
+	if (!lmu_bl->pwm) {
+		pwm = devm_pwm_get(lmu_bl->chip->dev, DEFAULT_PWM_NAME);
+		if (IS_ERR(pwm)) {
+			dev_err(lmu_bl->chip->dev,
+				"Can not get PWM device, err: %ld\n",
+				PTR_ERR(pwm));
+			return;
+		}
+
+		lmu_bl->pwm = pwm;
+
+		/*
+		 * FIXME: pwm_apply_args() should be removed when switching to
+		 * the atomic PWM API.
+		 */
+		pwm_apply_args(pwm);
+	}
+
+	period = lmu_bl->pwm_period;
+	duty = brightness * period / max_brightness;
+
+	pwm_config(lmu_bl->pwm, duty, period);
+	if (duty)
+		pwm_enable(lmu_bl->pwm);
+	else
+		pwm_disable(lmu_bl->pwm);
+}
+
+static int ti_lmu_backlight_update_brightness_register(struct ti_lmu_bl *lmu_bl,
+						       int brightness)
+{
+	const struct ti_lmu_bl_cfg *cfg = lmu_bl->chip->cfg;
+	const struct ti_lmu_bl_reg *reginfo = cfg->reginfo;
+	struct regmap *regmap = lmu_bl->chip->lmu->regmap;
+	u8 reg, val;
+	int ret;
+
+	if (lmu_bl->mode == BL_PWM_BASED) {
+		switch (cfg->pwm_action) {
+		case UPDATE_PWM_ONLY:
+			/* No register update is required */
+			return 0;
+		case UPDATE_MAX_BRT:
+			/*
+			 * PWM can start from any non-zero code and dim down
+			 * to zero. So, brightness register should be updated
+			 * even in PWM mode.
+			 */
+			if (brightness > 0)
+				brightness = MAX_BRIGHTNESS_11BIT;
+			else
+				brightness = 0;
+			break;
+		default:
+			break;
+		}
+	}
+
+	/*
+	 * Brightness register update
+	 *
+	 * 11 bit dimming: update LSB bits and write MSB byte.
+	 *		   MSB brightness should be shifted.
+	 *  8 bit dimming: write MSB byte.
+	 */
+
+	if (!reginfo->brightness_msb)
+		return -EINVAL;
+
+	if (cfg->max_brightness == MAX_BRIGHTNESS_11BIT) {
+		if (!reginfo->brightness_lsb)
+			return -EINVAL;
+
+		reg = reginfo->brightness_lsb[lmu_bl->bank_id];
+		ret = regmap_update_bits(regmap, reg,
+					 LMU_BACKLIGHT_11BIT_LSB_MASK,
+					 brightness);
+		if (ret)
+			return ret;
+
+		val = (brightness >> LMU_BACKLIGHT_11BIT_MSB_SHIFT) & 0xFF;
+	} else {
+		val = brightness & 0xFF;
+	}
+
+	reg = reginfo->brightness_msb[lmu_bl->bank_id];
+	return regmap_write(regmap, reg, val);
+}
+
+static int ti_lmu_backlight_update_status(struct backlight_device *bl_dev)
+{
+	struct ti_lmu_bl *lmu_bl = bl_get_data(bl_dev);
+	int brightness = bl_dev->props.brightness;
+	int ret;
+
+	if (bl_dev->props.state & BL_CORE_SUSPENDED)
+		brightness = 0;
+
+	if (brightness > 0)
+		ret = ti_lmu_backlight_enable(lmu_bl, 1);
+	else
+		ret = ti_lmu_backlight_enable(lmu_bl, 0);
+
+	if (ret)
+		return ret;
+
+	if (lmu_bl->mode == BL_PWM_BASED)
+		ti_lmu_backlight_pwm_ctrl(lmu_bl, brightness,
+					  bl_dev->props.max_brightness);
+
+	return ti_lmu_backlight_update_brightness_register(lmu_bl, brightness);
+}
+
+static const struct backlight_ops lmu_backlight_ops = {
+	.options = BL_CORE_SUSPENDRESUME,
+	.update_status = ti_lmu_backlight_update_status,
+};
+
+static int ti_lmu_backlight_of_get_ctrl_bank(struct device_node *np,
+					     struct ti_lmu_bl *lmu_bl)
+{
+	const char *name;
+	u32 *sources;
+	int num_channels = lmu_bl->chip->cfg->num_channels;
+	int ret, num_sources;
+
+	sources = devm_kzalloc(lmu_bl->chip->dev, num_channels, GFP_KERNEL);
+	if (!sources)
+		return -ENOMEM;
+
+	if (!of_property_read_string(np, "label", &name))
+		lmu_bl->name = name;
+	else
+		lmu_bl->name = np->name;
+
+	ret = of_property_count_u32_elems(np, "led-sources");
+	if (ret < 0 || ret > num_channels)
+		return -EINVAL;
+
+	num_sources = ret;
+	ret = of_property_read_u32_array(np, "led-sources", sources,
+					 num_sources);
+	if (ret)
+		return ret;
+
+	lmu_bl->led_sources = 0;
+	while (num_sources--)
+		set_bit(sources[num_sources], &lmu_bl->led_sources);
+
+	return 0;
+}
+
+static void ti_lmu_backlight_of_get_light_properties(struct device_node *np,
+						     struct ti_lmu_bl *lmu_bl)
+{
+	of_property_read_u32(np, "default-brightness-level",
+			     &lmu_bl->default_brightness);
+
+	of_property_read_u32(np, "ramp-up-msec",  &lmu_bl->ramp_up_msec);
+	of_property_read_u32(np, "ramp-down-msec", &lmu_bl->ramp_down_msec);
+}
+
+static void ti_lmu_backlight_of_get_brightness_mode(struct device_node *np,
+						    struct ti_lmu_bl *lmu_bl)
+{
+	of_property_read_u32(np, "pwm-period", &lmu_bl->pwm_period);
+
+	if (lmu_bl->pwm_period > 0)
+		lmu_bl->mode = BL_PWM_BASED;
+	else
+		lmu_bl->mode = BL_REGISTER_BASED;
+}
+
+static int ti_lmu_backlight_of_create(struct ti_lmu_bl_chip *chip,
+				      struct device_node *np)
+{
+	struct device_node *child;
+	struct ti_lmu_bl *lmu_bl, *each;
+	int ret, num_backlights;
+	int i = 0;
+
+	num_backlights = of_get_child_count(np);
+	if (num_backlights == 0) {
+		dev_err(chip->dev, "No backlight strings\n");
+		return -ENODEV;
+	}
+
+	/* One chip can have mulitple backlight strings */
+	lmu_bl = devm_kzalloc(chip->dev, sizeof(*lmu_bl) * num_backlights,
+			      GFP_KERNEL);
+	if (!lmu_bl)
+		return -ENOMEM;
+
+	/* Child is mapped to LMU backlight control bank */
+	for_each_child_of_node(np, child) {
+		each = lmu_bl + i;
+		each->bank_id = i;
+		each->chip = chip;
+
+		ret = ti_lmu_backlight_of_get_ctrl_bank(child, each);
+		if (ret) {
+			of_node_put(np);
+			return ret;
+		}
+
+		ti_lmu_backlight_of_get_light_properties(child, each);
+		ti_lmu_backlight_of_get_brightness_mode(child, each);
+
+		i++;
+	}
+
+	chip->lmu_bl = lmu_bl;
+	chip->num_backlights = num_backlights;
+
+	return 0;
+}
+
+static int ti_lmu_backlight_create_channel(struct ti_lmu_bl *lmu_bl)
+{
+	struct regmap *regmap = lmu_bl->chip->lmu->regmap;
+	u32 *reg = lmu_bl->chip->cfg->reginfo->channel;
+	int num_channels = lmu_bl->chip->cfg->num_channels;
+	int i, ret;
+	u8 shift;
+
+	/*
+	 * How to create backlight output channels:
+	 *   Check 'led_sources' bit and update registers.
+	 *
+	 *   1) Dual channel configuration
+	 *     The 1st register data is used for single channel.
+	 *     The 2nd register data is used for dual channel.
+	 *
+	 *   2) Multiple channel configuration
+	 *     Each register data is mapped to bank ID.
+	 *     Bit shift operation is defined in channel registers.
+	 *
+	 * Channel register data consists of address, mask, value.
+	 * Driver can get each data by using LMU_BL_GET_ADDR(),
+	 * LMU_BL_GET_MASK(), LMU_BL_GET_VAL().
+	 */
+
+	if (num_channels == NUM_DUAL_CHANNEL) {
+		if (lmu_bl->led_sources == LMU_BACKLIGHT_DUAL_CHANNEL_USED)
+			++reg;
+
+		return regmap_update_bits(regmap, LMU_BL_GET_ADDR(*reg),
+					  LMU_BL_GET_MASK(*reg),
+					  LMU_BL_GET_VAL(*reg));
+	}
+
+	for (i = 0; i < num_channels; i++) {
+		if (!reg)
+			break;
+
+		/*
+		 * Note that the result of LMU_BL_GET_VAL() is shift bit.
+		 * The bank_id should be shifted for the channel configuration.
+		 */
+		if (test_bit(i, &lmu_bl->led_sources)) {
+			shift = LMU_BL_GET_VAL(*reg);
+			ret = regmap_update_bits(regmap, LMU_BL_GET_ADDR(*reg),
+						 LMU_BL_GET_MASK(*reg),
+						 lmu_bl->bank_id << shift);
+			if (ret)
+				return ret;
+		}
+
+		reg++;
+	}
+
+	return 0;
+}
+
+static int ti_lmu_backlight_update_ctrl_mode(struct ti_lmu_bl *lmu_bl)
+{
+	struct regmap *regmap = lmu_bl->chip->lmu->regmap;
+	u32 *reg = lmu_bl->chip->cfg->reginfo->mode + lmu_bl->bank_id;
+	u8 val;
+
+	if (!reg)
+		return 0;
+
+	/*
+	 * Update PWM configuration register.
+	 * If the mode is register based, then clear the bit.
+	 */
+	if (lmu_bl->mode == BL_PWM_BASED)
+		val = LMU_BL_GET_VAL(*reg);
+	else
+		val = 0;
+
+	return regmap_update_bits(regmap, LMU_BL_GET_ADDR(*reg),
+				  LMU_BL_GET_MASK(*reg), val);
+}
+
+static int ti_lmu_backlight_convert_ramp_to_index(struct ti_lmu_bl *lmu_bl,
+						  enum ti_lmu_bl_ramp_mode mode)
+{
+	const int *ramp_table = lmu_bl->chip->cfg->ramp_table;
+	const int size = lmu_bl->chip->cfg->size_ramp;
+	unsigned int msec;
+	int i;
+
+	if (!ramp_table)
+		return -EINVAL;
+
+	switch (mode) {
+	case BL_RAMP_UP:
+		msec = lmu_bl->ramp_up_msec;
+		break;
+	case BL_RAMP_DOWN:
+		msec = lmu_bl->ramp_down_msec;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (msec <= ramp_table[0])
+		return 0;
+
+	if (msec > ramp_table[size - 1])
+		return size - 1;
+
+	for (i = 1; i < size; i++) {
+		if (msec == ramp_table[i])
+			return i;
+
+		/* Find an approximate index by looking up the table */
+		if (msec > ramp_table[i - 1] && msec < ramp_table[i]) {
+			if (msec - ramp_table[i - 1] < ramp_table[i] - msec)
+				return i - 1;
+			else
+				return i;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static int ti_lmu_backlight_set_ramp(struct ti_lmu_bl *lmu_bl)
+{
+	struct regmap *regmap = lmu_bl->chip->lmu->regmap;
+	const struct ti_lmu_bl_reg *reginfo = lmu_bl->chip->cfg->reginfo;
+	int offset = reginfo->ramp_reg_offset;
+	int i, ret, index;
+	u32 reg;
+
+	for (i = BL_RAMP_UP; i <= BL_RAMP_DOWN; i++) {
+		index = ti_lmu_backlight_convert_ramp_to_index(lmu_bl, i);
+		if (index > 0) {
+			if (!reginfo->ramp)
+				break;
+
+			if (lmu_bl->bank_id == 0)
+				reg = reginfo->ramp[i];
+			else
+				reg = reginfo->ramp[i] + offset;
+
+			/*
+			 * Note that the result of LMU_BL_GET_VAL() is
+			 * shift bit. So updated bit is shifted index value.
+			 */
+			ret = regmap_update_bits(regmap, LMU_BL_GET_ADDR(reg),
+						 LMU_BL_GET_MASK(reg),
+						 index << LMU_BL_GET_VAL(reg));
+			if (ret)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int ti_lmu_backlight_configure(struct ti_lmu_bl *lmu_bl)
+{
+	int ret;
+
+	ret = ti_lmu_backlight_create_channel(lmu_bl);
+	if (ret)
+		return ret;
+
+	ret = ti_lmu_backlight_update_ctrl_mode(lmu_bl);
+	if (ret)
+		return ret;
+
+	return ti_lmu_backlight_set_ramp(lmu_bl);
+}
+
+static int ti_lmu_backlight_init(struct ti_lmu_bl_chip *chip)
+{
+	struct regmap *regmap = chip->lmu->regmap;
+	u32 *reg = chip->cfg->reginfo->init;
+	int num_init = chip->cfg->reginfo->num_init;
+	int i, ret;
+
+	/*
+	 * 'init' register data consists of address, mask, value.
+	 * Driver can get each data by using LMU_BL_GET_ADDR(),
+	 * LMU_BL_GET_MASK(), LMU_BL_GET_VAL().
+	 */
+
+	for (i = 0; i < num_init; i++) {
+		if (!reg)
+			break;
+
+		ret = regmap_update_bits(regmap, LMU_BL_GET_ADDR(*reg),
+					 LMU_BL_GET_MASK(*reg),
+					 LMU_BL_GET_VAL(*reg));
+		if (ret)
+			return ret;
+
+		reg++;
+	}
+
+	return 0;
+}
+
+static int ti_lmu_backlight_reload(struct ti_lmu_bl_chip *chip)
+{
+	struct ti_lmu_bl *each;
+	int i, ret;
+
+	ret = ti_lmu_backlight_init(chip);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < chip->num_backlights; i++) {
+		each = chip->lmu_bl + i;
+		ret = ti_lmu_backlight_configure(each);
+		if (ret)
+			return ret;
+
+		backlight_update_status(each->bl_dev);
+	}
+
+	return 0;
+}
+
+static int ti_lmu_backlight_add_device(struct device *dev,
+				       struct ti_lmu_bl *lmu_bl)
+{
+	struct backlight_device *bl_dev;
+	struct backlight_properties props;
+
+	memset(&props, 0, sizeof(struct backlight_properties));
+	props.type = BACKLIGHT_PLATFORM;
+	props.brightness = lmu_bl->default_brightness;
+	props.max_brightness = lmu_bl->chip->cfg->max_brightness;
+
+	bl_dev = devm_backlight_device_register(dev, lmu_bl->name,
+						lmu_bl->chip->dev, lmu_bl,
+						&lmu_backlight_ops, &props);
+	if (IS_ERR(bl_dev))
+		return PTR_ERR(bl_dev);
+
+	lmu_bl->bl_dev = bl_dev;
+
+	return 0;
+}
+
+static struct ti_lmu_bl_chip *
+ti_lmu_backlight_register(struct device *dev, struct ti_lmu *lmu,
+			  const struct ti_lmu_bl_cfg *cfg)
+{
+	struct ti_lmu_bl_chip *chip;
+	struct ti_lmu_bl *each;
+	int i, ret;
+
+	if (!cfg) {
+		dev_err(dev, "Operation is not configured\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return ERR_PTR(-ENOMEM);
+
+	chip->dev = dev;
+	chip->lmu = lmu;
+	chip->cfg = cfg;
+
+	ret = ti_lmu_backlight_of_create(chip, dev->of_node);
+	if (ret)
+		return ERR_PTR(ret);
+
+	ret = ti_lmu_backlight_init(chip);
+	if (ret) {
+		dev_err(dev, "Backlight init err: %d\n", ret);
+		return ERR_PTR(ret);
+	}
+
+	for (i = 0; i < chip->num_backlights; i++) {
+		each = chip->lmu_bl + i;
+
+		ret = ti_lmu_backlight_configure(each);
+		if (ret) {
+			dev_err(dev, "Backlight config err: %d\n", ret);
+			return ERR_PTR(ret);
+		}
+
+		ret = ti_lmu_backlight_add_device(dev, each);
+		if (ret) {
+			dev_err(dev, "Backlight device err: %d\n", ret);
+			return ERR_PTR(ret);
+		}
+
+		backlight_update_status(each->bl_dev);
+	}
+
+	return chip;
+}
+
+static void ti_lmu_backlight_unregister(struct ti_lmu_bl_chip *chip)
+{
+	struct ti_lmu_bl *each;
+	int i;
+
+	/* Turn off the brightness */
+	for (i = 0; i < chip->num_backlights; i++) {
+		each = chip->lmu_bl + i;
+		each->bl_dev->props.brightness = 0;
+		backlight_update_status(each->bl_dev);
+	}
+}
+
+static int ti_lmu_backlight_monitor_notifier(struct notifier_block *nb,
+					     unsigned long action, void *unused)
+{
+	struct ti_lmu_bl_chip *chip = container_of(nb, struct ti_lmu_bl_chip,
+						   nb);
+
+	if (action == LMU_EVENT_MONITOR_DONE) {
+		if (ti_lmu_backlight_reload(chip))
+			return NOTIFY_STOP;
+	}
+
+	return NOTIFY_OK;
+}
+
+static int ti_lmu_backlight_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ti_lmu *lmu = dev_get_drvdata(dev->parent);
+	struct ti_lmu_bl_chip *chip;
+	int ret;
+
+	chip = ti_lmu_backlight_register(dev, lmu, &lmu_bl_cfg[pdev->id]);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+
+	/*
+	 * Notifier callback is required because backlight device needs
+	 * reconfiguration after fault detection procedure is done by
+	 * ti-lmu-fault-monitor driver.
+	 */
+	if (chip->cfg->fault_monitor_used) {
+		chip->nb.notifier_call = ti_lmu_backlight_monitor_notifier;
+		ret = blocking_notifier_chain_register(&chip->lmu->notifier,
+						       &chip->nb);
+		if (ret)
+			return ret;
+	}
+
+	platform_set_drvdata(pdev, chip);
+
+	return 0;
+}
+
+static int ti_lmu_backlight_remove(struct platform_device *pdev)
+{
+	struct ti_lmu_bl_chip *chip = platform_get_drvdata(pdev);
+
+	if (chip->cfg->fault_monitor_used)
+		blocking_notifier_chain_unregister(&chip->lmu->notifier,
+						   &chip->nb);
+
+	ti_lmu_backlight_unregister(chip);
+
+	return 0;
+}
+
+static struct platform_driver ti_lmu_backlight_driver = {
+	.probe  = ti_lmu_backlight_probe,
+	.remove = ti_lmu_backlight_remove,
+	.driver = {
+		.name = "ti-lmu-backlight",
+	},
+};
+
+module_platform_driver(ti_lmu_backlight_driver)
+
+MODULE_DESCRIPTION("TI LMU Backlight Driver");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:ti-lmu-backlight");
diff --git a/drivers/video/backlight/ti-lmu-backlight-data.c b/drivers/video/backlight/ti-lmu-backlight-data.c
new file mode 100644
index 000000000000..83fa98d217b2
--- /dev/null
+++ b/drivers/video/backlight/ti-lmu-backlight-data.c
@@ -0,0 +1,287 @@
+/*
+ * TI LMU (Lighting Management Unit) Backlight Device Data
+ *
+ * Copyright 2017 Texas Instruments
+ *
+ * Author: Milo Kim <milo.kim@xxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/mfd/ti-lmu.h>
+#include <linux/mfd/ti-lmu-backlight.h>
+#include <linux/mfd/ti-lmu-register.h>
+#include <linux/module.h>
+
+/* LM3532 */
+static u32 lm3532_init_regs[] = {
+	LM3532_INIT_ZONE_0,
+	LM3532_INIT_ZONE_1,
+	LM3532_INIT_ZONE_2,
+};
+
+static u32 lm3532_channel_regs[] = {
+	LM3532_CHANNEL_1,
+	LM3532_CHANNEL_2,
+	LM3532_CHANNEL_3,
+};
+
+static u32 lm3532_mode_regs[] = {
+	LM3532_MODE_PWM_A,
+	LM3532_MODE_PWM_B,
+	LM3532_MODE_PWM_C,
+};
+
+static u32 lm3532_ramp_regs[] = {
+	LM3532_RAMPUP,
+	LM3532_RAMPDN,
+};
+
+static u8 lm3532_enable_reg = LM3532_REG_ENABLE;
+
+static u8 lm3532_brightness_regs[] = {
+	LM3532_REG_BRT_A,
+	LM3532_REG_BRT_B,
+	LM3532_REG_BRT_C,
+};
+
+static const struct ti_lmu_bl_reg lm3532_reg_info = {
+	.init		= lm3532_init_regs,
+	.num_init	= ARRAY_SIZE(lm3532_init_regs),
+	.channel	= lm3532_channel_regs,
+	.mode		= lm3532_mode_regs,
+	.ramp		= lm3532_ramp_regs,
+	.enable		= &lm3532_enable_reg,
+	.brightness_msb	= lm3532_brightness_regs,
+};
+
+/* LM3631 */
+static u32 lm3631_init_regs[] = {
+	LM3631_INIT_BRT_MODE,
+	LM3631_INIT_DIMMING_MODE,
+};
+
+static u32 lm3631_channel_regs[]  = {
+	LM3631_SINGLE_CHANNEL,
+	LM3631_DUAL_CHANNEL,
+};
+
+static u32 lm3631_ramp_reg = LM3631_RAMP;
+static u8 lm3631_enable_reg = LM3631_REG_DEVCTRL;
+static u8 lm3631_brightness_msb_reg = LM3631_REG_BRT_MSB;
+static u8 lm3631_brightness_lsb_reg = LM3631_REG_BRT_LSB;
+
+static const struct ti_lmu_bl_reg lm3631_reg_info = {
+	.init		= lm3631_init_regs,
+	.num_init	= ARRAY_SIZE(lm3631_init_regs),
+	.channel	= lm3631_channel_regs,
+	.ramp		= &lm3631_ramp_reg,
+	.enable		= &lm3631_enable_reg,
+	.brightness_msb	= &lm3631_brightness_msb_reg,
+	.brightness_lsb	= &lm3631_brightness_lsb_reg,
+};
+
+/* LM3632 */
+static u32 lm3632_init_regs[] = {
+	LM3632_INIT_OVP_25V,
+	LM3632_INIT_SWFREQ_1MHZ,
+};
+
+static u32 lm3632_channel_regs[]  = {
+	LM3632_SINGLE_CHANNEL,
+	LM3632_DUAL_CHANNEL,
+};
+
+static u32 lm3632_mode_reg = LM3632_MODE_PWM;
+static u8 lm3632_enable_reg = LM3632_REG_ENABLE;
+static u8 lm3632_brightness_msb_reg = LM3632_REG_BRT_MSB;
+static u8 lm3632_brightness_lsb_reg = LM3632_REG_BRT_LSB;
+
+static const struct ti_lmu_bl_reg lm3632_reg_info = {
+	.init		= lm3632_init_regs,
+	.num_init	= ARRAY_SIZE(lm3632_init_regs),
+	.channel	= lm3632_channel_regs,
+	.mode		= &lm3632_mode_reg,
+	.enable		= &lm3632_enable_reg,
+	.brightness_msb	= &lm3632_brightness_msb_reg,
+	.brightness_lsb	= &lm3632_brightness_lsb_reg,
+};
+
+/* LM3633 */
+static u32 lm3633_init_regs[] = {
+	LM3633_INIT_OVP_40V,
+	LM3633_INIT_RAMP_SELECT,
+};
+
+static u32 lm3633_channel_regs[]  = {
+	LM3633_CHANNEL_HVLED1,
+	LM3633_CHANNEL_HVLED2,
+	LM3633_CHANNEL_HVLED3,
+};
+
+static u32 lm3633_mode_regs[] = {
+	LM3633_MODE_PWM_A,
+	LM3633_MODE_PWM_B,
+};
+
+static u32 lm3633_ramp_regs[] = {
+	LM3633_RAMPUP,
+	LM3633_RAMPDN,
+};
+
+static u8 lm3633_enable_reg = LM3633_REG_ENABLE;
+
+static u8 lm3633_brightness_msb_regs[] = {
+	LM3633_REG_BRT_HVLED_A_MSB,
+	LM3633_REG_BRT_HVLED_B_MSB,
+};
+
+static u8 lm3633_brightness_lsb_regs[] = {
+	LM3633_REG_BRT_HVLED_A_LSB,
+	LM3633_REG_BRT_HVLED_B_LSB,
+};
+
+static const struct ti_lmu_bl_reg lm3633_reg_info = {
+	.init		 = lm3633_init_regs,
+	.num_init	 = ARRAY_SIZE(lm3633_init_regs),
+	.channel	 = lm3633_channel_regs,
+	.mode		 = lm3633_mode_regs,
+	.ramp		 = lm3633_ramp_regs,
+	.ramp_reg_offset = 1, /* For LM3633_REG_BL1_RAMPUP/DN */
+	.enable		 = &lm3633_enable_reg,
+	.brightness_msb	 = lm3633_brightness_msb_regs,
+	.brightness_lsb	 = lm3633_brightness_lsb_regs,
+};
+
+/* LM3695 */
+static u32 lm3695_init_regs[] = {
+	LM3695_INIT_BRT_MODE,
+};
+
+static u32 lm3695_channel_regs[]  = {
+	LM3695_SINGLE_CHANNEL,
+	LM3695_DUAL_CHANNEL,
+};
+
+static u8 lm3695_enable_reg = LM3695_REG_GP;
+static u8 lm3695_brightness_msb_reg = LM3695_REG_BRT_MSB;
+static u8 lm3695_brightness_lsb_reg = LM3695_REG_BRT_LSB;
+
+static const struct ti_lmu_bl_reg lm3695_reg_info = {
+	.init		= lm3695_init_regs,
+	.num_init	= ARRAY_SIZE(lm3695_init_regs),
+	.channel	= lm3695_channel_regs,
+	.enable		= &lm3695_enable_reg,
+	.enable_usec	= 600,
+	.brightness_msb	= &lm3695_brightness_msb_reg,
+	.brightness_lsb	= &lm3695_brightness_lsb_reg,
+};
+
+/* LM3697 */
+static u32 lm3697_init_regs[] = {
+	LM3697_INIT_RAMP_SELECT,
+};
+
+static u32 lm3697_channel_regs[]  = {
+	LM3697_CHANNEL_1,
+	LM3697_CHANNEL_2,
+	LM3697_CHANNEL_3,
+};
+
+static u32 lm3697_mode_regs[] = {
+	LM3697_MODE_PWM_A,
+	LM3697_MODE_PWM_B,
+};
+
+static u32 lm3697_ramp_regs[] = {
+	LM3697_RAMPUP,
+	LM3697_RAMPDN,
+};
+
+static u8 lm3697_enable_reg = LM3697_REG_ENABLE;
+
+static u8 lm3697_brightness_msb_regs[] = {
+	LM3697_REG_BRT_A_MSB,
+	LM3697_REG_BRT_B_MSB,
+};
+
+static u8 lm3697_brightness_lsb_regs[] = {
+	LM3697_REG_BRT_A_LSB,
+	LM3697_REG_BRT_B_LSB,
+};
+
+static const struct ti_lmu_bl_reg lm3697_reg_info = {
+	.init		 = lm3697_init_regs,
+	.num_init	 = ARRAY_SIZE(lm3697_init_regs),
+	.channel	 = lm3697_channel_regs,
+	.mode		 = lm3697_mode_regs,
+	.ramp		 = lm3697_ramp_regs,
+	.ramp_reg_offset = 1, /* For LM3697_REG_BL1_RAMPUP/DN */
+	.enable		 = &lm3697_enable_reg,
+	.brightness_msb	 = lm3697_brightness_msb_regs,
+	.brightness_lsb	 = lm3697_brightness_lsb_regs,
+};
+
+static int lm3532_ramp_table[] = { 0, 1, 2, 4, 8, 16, 32, 65 };
+
+static int lm3631_ramp_table[] = {
+	   0,   1,   2,    5,   10,   20,   50,  100,
+	 250, 500, 750, 1000, 1500, 2000, 3000, 4000,
+};
+
+static int common_ramp_table[] = {
+	   2, 250, 500, 1000, 2000, 4000, 8000, 16000,
+};
+
+struct ti_lmu_bl_cfg lmu_bl_cfg[LMU_MAX_ID] = {
+	{
+		.reginfo		= &lm3532_reg_info,
+		.num_channels		= LM3532_MAX_CHANNELS,
+		.max_brightness		= MAX_BRIGHTNESS_8BIT,
+		.pwm_action		= UPDATE_PWM_AND_BRT_REGISTER,
+		.ramp_table		= lm3532_ramp_table,
+		.size_ramp		= ARRAY_SIZE(lm3532_ramp_table),
+	},
+	{
+		.reginfo		= &lm3631_reg_info,
+		.num_channels		= LM3631_MAX_CHANNELS,
+		.max_brightness		= MAX_BRIGHTNESS_11BIT,
+		.pwm_action		= UPDATE_PWM_ONLY,
+		.ramp_table		= lm3631_ramp_table,
+		.size_ramp		= ARRAY_SIZE(lm3631_ramp_table),
+	},
+	{
+		.reginfo		= &lm3632_reg_info,
+		.num_channels		= LM3632_MAX_CHANNELS,
+		.max_brightness		= MAX_BRIGHTNESS_11BIT,
+		.pwm_action		= UPDATE_PWM_ONLY,
+	},
+	{
+		.reginfo		= &lm3633_reg_info,
+		.num_channels		= LM3633_MAX_CHANNELS,
+		.max_brightness		= MAX_BRIGHTNESS_11BIT,
+		.pwm_action		= UPDATE_MAX_BRT,
+		.ramp_table		= common_ramp_table,
+		.size_ramp		= ARRAY_SIZE(common_ramp_table),
+		.fault_monitor_used	= true,
+	},
+	{
+		.reginfo		= &lm3695_reg_info,
+		.num_channels		= LM3695_MAX_CHANNELS,
+		.max_brightness		= MAX_BRIGHTNESS_11BIT,
+		.pwm_action		= UPDATE_PWM_AND_BRT_REGISTER,
+	},
+	{
+		.reginfo		= &lm3697_reg_info,
+		.num_channels		= LM3697_MAX_CHANNELS,
+		.max_brightness		= MAX_BRIGHTNESS_11BIT,
+		.pwm_action		= UPDATE_PWM_AND_BRT_REGISTER,
+		.ramp_table		= common_ramp_table,
+		.size_ramp		= ARRAY_SIZE(common_ramp_table),
+		.fault_monitor_used	= true,
+	},
+};
+EXPORT_SYMBOL_GPL(lmu_bl_cfg);
diff --git a/include/linux/mfd/ti-lmu-backlight.h b/include/linux/mfd/ti-lmu-backlight.h
new file mode 100644
index 000000000000..9aa1d6ce7393
--- /dev/null
+++ b/include/linux/mfd/ti-lmu-backlight.h
@@ -0,0 +1,290 @@
+/*
+ * TI LMU (Lighting Management Unit) Backlight Common Driver
+ *
+ * Copyright 2017 Texas Instruments
+ *
+ * Author: Milo Kim <milo.kim@xxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __TI_LMU_BACKLIGHT_H__
+#define __TI_LMU_BACKLIGHT_H__
+
+#include <linux/backlight.h>
+#include <linux/device.h>
+#include <linux/mfd/ti-lmu.h>
+#include <linux/mfd/ti-lmu-register.h>
+#include <linux/notifier.h>
+
+/**
+ * LMU backlight register data
+ *	value[23:16] | mask[15:8] | address[7:0]
+ */
+#define LMU_BL_REG(addr, mask, value)				\
+	((value << 16) | (mask << 8) | addr)
+
+#define LMU_BL_GET_ADDR(x)	(x & 0xFF)
+#define LMU_BL_GET_MASK(x)	((x >> 8) & 0xFF)
+#define LMU_BL_GET_VAL(x)	((x >> 16) & 0xFF)
+
+#define LM3532_INIT_ZONE_0						\
+	LMU_BL_REG(LM3532_REG_ZONE_CFG_A, LM3532_ZONE_MASK, LM3532_ZONE_0)
+#define LM3532_INIT_ZONE_1						\
+	LMU_BL_REG(LM3532_REG_ZONE_CFG_B, LM3532_ZONE_MASK, LM3532_ZONE_1)
+#define LM3532_INIT_ZONE_2						\
+	LMU_BL_REG(LM3532_REG_ZONE_CFG_C, LM3532_ZONE_MASK, LM3532_ZONE_2)
+#define LM3532_CHANNEL_1						\
+	LMU_BL_REG(LM3532_REG_OUTPUT_CFG, LM3532_ILED1_CFG_MASK,	\
+	LM3532_ILED1_CFG_SHIFT)
+#define LM3532_CHANNEL_2						\
+	LMU_BL_REG(LM3532_REG_OUTPUT_CFG, LM3532_ILED2_CFG_MASK,	\
+	LM3532_ILED2_CFG_SHIFT)
+#define LM3532_CHANNEL_3						\
+	LMU_BL_REG(LM3532_REG_OUTPUT_CFG, LM3532_ILED3_CFG_MASK,	\
+	LM3532_ILED3_CFG_SHIFT)
+#define LM3532_MODE_PWM_A						\
+	LMU_BL_REG(LM3532_REG_PWM_A_CFG, LM3532_PWM_A_MASK, LM3532_PWM_ZONE_0)
+#define LM3532_MODE_PWM_B						\
+	LMU_BL_REG(LM3532_REG_PWM_B_CFG, LM3532_PWM_B_MASK, LM3532_PWM_ZONE_1)
+#define LM3532_MODE_PWM_C						\
+	LMU_BL_REG(LM3532_REG_PWM_C_CFG, LM3532_PWM_C_MASK, LM3532_PWM_ZONE_2)
+#define LM3532_RAMPUP							\
+	LMU_BL_REG(LM3532_REG_RAMPUP, LM3532_RAMPUP_MASK, LM3532_RAMPUP_SHIFT)
+#define LM3532_RAMPDN							\
+	LMU_BL_REG(LM3532_REG_RAMPDN, LM3532_RAMPDN_MASK, LM3532_RAMPDN_SHIFT)
+
+#define LM3631_INIT_BRT_MODE						\
+	LMU_BL_REG(LM3631_REG_BRT_MODE, LM3631_MODE_MASK, LM3631_DEFAULT_MODE)
+#define LM3631_INIT_DIMMING_MODE					\
+	LMU_BL_REG(LM3631_REG_BL_CFG, LM3631_MAP_MASK, LM3631_EXPONENTIAL_MAP)
+#define LM3631_SINGLE_CHANNEL						\
+	LMU_BL_REG(LM3631_REG_BL_CFG, LM3631_BL_CHANNEL_MASK,		\
+	LM3631_BL_SINGLE_CHANNEL)
+#define LM3631_DUAL_CHANNEL						\
+	LMU_BL_REG(LM3631_REG_BL_CFG, LM3631_BL_CHANNEL_MASK,		\
+	LM3631_BL_DUAL_CHANNEL)
+#define LM3631_RAMP							\
+	LMU_BL_REG(LM3631_REG_SLOPE, LM3631_SLOPE_MASK, LM3631_SLOPE_SHIFT)
+
+#define LM3632_INIT_OVP_25V						\
+	LMU_BL_REG(LM3632_REG_CONFIG1, LM3632_OVP_MASK, LM3632_OVP_25V)
+#define LM3632_INIT_SWFREQ_1MHZ						\
+	LMU_BL_REG(LM3632_REG_CONFIG2, LM3632_SWFREQ_MASK, LM3632_SWFREQ_1MHZ)
+#define LM3632_SINGLE_CHANNEL						\
+	LMU_BL_REG(LM3632_REG_ENABLE, LM3632_BL_CHANNEL_MASK,		\
+	LM3632_BL_SINGLE_CHANNEL)
+#define LM3632_DUAL_CHANNEL						\
+	LMU_BL_REG(LM3632_REG_ENABLE, LM3632_BL_CHANNEL_MASK,		\
+	LM3632_BL_DUAL_CHANNEL)
+#define LM3632_MODE_PWM							\
+	LMU_BL_REG(LM3632_REG_IO_CTRL, LM3632_PWM_MASK, LM3632_PWM_MODE)
+
+#define LM3633_INIT_OVP_40V						\
+	LMU_BL_REG(LM3633_REG_BOOST_CFG, LM3633_OVP_MASK, LM3633_OVP_40V)
+#define LM3633_INIT_RAMP_SELECT						\
+	LMU_BL_REG(LM3633_REG_BL_RAMP_CONF, LM3633_BL_RAMP_MASK,	\
+	LM3633_BL_RAMP_EACH)
+#define LM3633_CHANNEL_HVLED1						\
+	LMU_BL_REG(LM3633_REG_HVLED_OUTPUT_CFG, LM3633_HVLED1_CFG_MASK,	\
+	LM3633_HVLED1_CFG_SHIFT)
+#define LM3633_CHANNEL_HVLED2						\
+	LMU_BL_REG(LM3633_REG_HVLED_OUTPUT_CFG, LM3633_HVLED2_CFG_MASK,	\
+	LM3633_HVLED2_CFG_SHIFT)
+#define LM3633_CHANNEL_HVLED3						\
+	LMU_BL_REG(LM3633_REG_HVLED_OUTPUT_CFG, LM3633_HVLED3_CFG_MASK,	\
+	LM3633_HVLED3_CFG_SHIFT)
+#define LM3633_MODE_PWM_A						\
+	LMU_BL_REG(LM3633_REG_PWM_CFG, LM3633_PWM_A_MASK, LM3633_PWM_A_MASK)
+#define LM3633_MODE_PWM_B						\
+	LMU_BL_REG(LM3633_REG_PWM_CFG, LM3633_PWM_B_MASK, LM3633_PWM_B_MASK)
+#define LM3633_RAMPUP							\
+	LMU_BL_REG(LM3633_REG_BL0_RAMP, LM3633_BL_RAMPUP_MASK,		\
+	LM3633_BL_RAMPUP_SHIFT)
+#define LM3633_RAMPDN							\
+	LMU_BL_REG(LM3633_REG_BL0_RAMP, LM3633_BL_RAMPDN_MASK,		\
+	LM3633_BL_RAMPDN_SHIFT)
+
+#define LM3695_INIT_BRT_MODE						\
+	LMU_BL_REG(LM3695_REG_GP, LM3695_BRT_RW_MASK, LM3695_BRT_RW_MASK)
+#define LM3695_SINGLE_CHANNEL						\
+	LMU_BL_REG(LM3695_REG_GP, LM3695_BL_CHANNEL_MASK,		\
+	LM3695_BL_SINGLE_CHANNEL)
+#define LM3695_DUAL_CHANNEL						\
+	LMU_BL_REG(LM3695_REG_GP, LM3695_BL_CHANNEL_MASK,		\
+	LM3695_BL_DUAL_CHANNEL)
+
+#define LM3697_INIT_RAMP_SELECT						\
+	LMU_BL_REG(LM3697_REG_RAMP_CONF, LM3697_RAMP_MASK, LM3697_RAMP_EACH)
+#define LM3697_CHANNEL_1						\
+	LMU_BL_REG(LM3697_REG_HVLED_OUTPUT_CFG, LM3697_HVLED1_CFG_MASK,	\
+	LM3697_HVLED1_CFG_SHIFT)
+#define LM3697_CHANNEL_2						\
+	LMU_BL_REG(LM3697_REG_HVLED_OUTPUT_CFG, LM3697_HVLED2_CFG_MASK,	\
+	LM3697_HVLED2_CFG_SHIFT)
+#define LM3697_CHANNEL_3						\
+	LMU_BL_REG(LM3697_REG_HVLED_OUTPUT_CFG, LM3697_HVLED3_CFG_MASK,	\
+	LM3697_HVLED3_CFG_SHIFT)
+#define LM3697_MODE_PWM_A						\
+	LMU_BL_REG(LM3697_REG_PWM_CFG, LM3697_PWM_A_MASK, LM3697_PWM_A_MASK)
+#define LM3697_MODE_PWM_B						\
+	LMU_BL_REG(LM3697_REG_PWM_CFG, LM3697_PWM_B_MASK, LM3697_PWM_B_MASK)
+#define LM3697_RAMPUP							\
+	LMU_BL_REG(LM3697_REG_BL0_RAMP, LM3697_RAMPUP_MASK, LM3697_RAMPUP_SHIFT)
+#define LM3697_RAMPDN							\
+	LMU_BL_REG(LM3697_REG_BL0_RAMP, LM3697_RAMPDN_MASK, LM3697_RAMPDN_SHIFT)
+
+#define LM3532_MAX_CHANNELS		3
+#define LM3631_MAX_CHANNELS		2
+#define LM3632_MAX_CHANNELS		2
+#define LM3633_MAX_CHANNELS		3
+#define LM3695_MAX_CHANNELS		2
+#define LM3697_MAX_CHANNELS		3
+
+#define MAX_BRIGHTNESS_8BIT		255
+#define MAX_BRIGHTNESS_11BIT		2047
+
+enum ti_lmu_bl_ctrl_mode {
+	BL_REGISTER_BASED,
+	BL_PWM_BASED,
+};
+
+enum ti_lmu_bl_pwm_action {
+	/* Update PWM duty, no brightness register update is required */
+	UPDATE_PWM_ONLY,
+	/* Update not only duty but also brightness register */
+	UPDATE_PWM_AND_BRT_REGISTER,
+	/* Update max value in brightness registers */
+	UPDATE_MAX_BRT,
+};
+
+enum ti_lmu_bl_ramp_mode {
+	BL_RAMP_UP,
+	BL_RAMP_DOWN,
+};
+
+struct ti_lmu_bl;
+struct ti_lmu_bl_chip;
+
+/**
+ * struct ti_lmu_bl_reg
+ *
+ * @init:		Device initialization registers
+ * @num_init:		Numbers of initialization registers
+ * @channel:		Backlight channel configuration registers
+ * @mode:		Brightness control mode registers
+ * @ramp:		Ramp registers for lighting effect
+ * @ramp_reg_offset:	Ramp register offset.
+ *			Only used for multiple ramp registers.
+ * @enable:		Enable control register address
+ * @enable_usec:	Delay time for updating enable register.
+ *			Unit is microsecond.
+ * @brightness_msb:	Brightness MSB(Upper 8 bits) registers.
+ *			Concatenated with LSB in 11 bit dimming mode.
+ *			In 8 bit dimming, only MSB is used.
+ * @brightness_lsb:	Brightness LSB(Lower 3 bits) registers.
+ *			Only valid in 11 bit dimming mode.
+ */
+struct ti_lmu_bl_reg {
+	u32 *init;
+	int num_init;
+	u32 *channel;
+	u32 *mode;
+	u32 *ramp;
+	int ramp_reg_offset;
+	u8 *enable;
+	unsigned long enable_usec;
+	u8 *brightness_msb;
+	u8 *brightness_lsb;
+};
+
+/**
+ * struct ti_lmu_bl_cfg
+ *
+ * @reginfo:		Device register configuration
+ * @num_channels:	Number of backlight channels
+ * @max_brightness:	Max brightness value of backlight device
+ * @pwm_action:		How to control brightness registers in PWM mode
+ * @ramp_table:		[Optional] Ramp time table for lighting effect.
+ *			It's used for searching approximate register index.
+ * @size_ramp:		[Optional] Size of ramp table
+ * @fault_monitor_used:	[Optional] Set true if the device needs to handle
+ *			LMU fault monitor event.
+ *
+ * This structure is used for device specific data configuration.
+ */
+struct ti_lmu_bl_cfg {
+	const struct ti_lmu_bl_reg *reginfo;
+	int num_channels;
+	int max_brightness;
+	enum ti_lmu_bl_pwm_action pwm_action;
+	int *ramp_table;
+	int size_ramp;
+	bool fault_monitor_used;
+};
+
+/**
+ * struct ti_lmu_bl_chip
+ *
+ * @dev:		Parent device pointer
+ * @lmu:		LMU structure.
+ *			Used for register R/W access and notification.
+ * @cfg:		Device configuration data
+ * @lmu_bl:		Multiple backlight channels
+ * @num_backlights:	Number of backlight channels
+ * @nb:			Notifier block for handling LMU fault monitor event
+ *
+ * One backlight chip can have multiple backlight channels, 'ti_lmu_bl'.
+ */
+struct ti_lmu_bl_chip {
+	struct device *dev;
+	struct ti_lmu *lmu;
+	const struct ti_lmu_bl_cfg *cfg;
+	struct ti_lmu_bl *lmu_bl;
+	int num_backlights;
+	struct notifier_block nb;
+};
+
+/**
+ * struct ti_lmu_bl
+ *
+ * @chip:		Pointer to parent backlight device
+ * @bl_dev:		Backlight subsystem device structure
+ * @bank_id:		Backlight bank ID
+ * @name:		Backlight channel name
+ * @mode:		Backlight control mode
+ * @led_sources:	Backlight output channel configuration.
+ *			Bit mask is set on parsing DT.
+ * @default_brightness:	[Optional] Initial brightness value
+ * @ramp_up_msec:	[Optional] Ramp up time
+ * @ramp_down_msec:	[Optional] Ramp down time
+ * @pwm_period:		[Optional] PWM period
+ * @pwm:		[Optional] PWM subsystem structure
+ *
+ * Each backlight device has its own channel configuration.
+ * For chip control, parent chip data structure is used.
+ */
+struct ti_lmu_bl {
+	struct ti_lmu_bl_chip *chip;
+	struct backlight_device *bl_dev;
+
+	int bank_id;
+	const char *name;
+	enum ti_lmu_bl_ctrl_mode mode;
+	unsigned long led_sources;
+
+	unsigned int default_brightness;
+
+	/* Used for lighting effect */
+	unsigned int ramp_up_msec;
+	unsigned int ramp_down_msec;
+
+	/* Only valid in PWM mode */
+	unsigned int pwm_period;
+	struct pwm_device *pwm;
+};
+
+extern struct ti_lmu_bl_cfg lmu_bl_cfg[LMU_MAX_ID];
+#endif
-- 
2.11.0