[PATCH v4 0/7] LMU Rework

[PATCH v4 0/7] LMU Rework

[Dan Murphy]

Hello

With this series there was an offline discussion that the filename of the LED
portion of the driver did not adhere to the directory file naming convention so
the file name has been changed

ti-lmu-led-common.c->leds-ti-lmu-common.c
ti-lmu-led-common.h->leds-ti-lmu-common.h

Dan

Dan Murphy (7):
  dt-bindings: mfd: LMU: Fix lm3632 dt binding example
  dt-bindings: mfd: LMU: Add the ramp up/down property
  dt-bindings: mfd: LMU: Add ti,brightness-resolution
  leds: TI LMU: Add common code for TI LMU devices
  dt-bindings: ti-lmu: Modify dt bindings for the LM3697
  mfd: ti-lmu: Remove support for LM3697
  leds: lm3697: Introduce the lm3697 driver

 .../devicetree/bindings/leds/leds-lm3697.txt  |  73 ++++
 .../devicetree/bindings/mfd/ti-lmu.txt        |  58 ++-
 drivers/leds/Kconfig                          |  15 +
 drivers/leds/Makefile                         |   2 +
 drivers/leds/leds-lm3697.c                    | 395 ++++++++++++++++++
 drivers/leds/leds-ti-lmu-common.c             | 156 +++++++
 drivers/mfd/Kconfig                           |   2 +-
 drivers/mfd/ti-lmu.c                          |  17 -
 include/linux/leds-ti-lmu-common.h            |  47 +++
 include/linux/mfd/ti-lmu-register.h           |  44 --
 include/linux/mfd/ti-lmu.h                    |   1 -
 11 files changed, 714 insertions(+), 96 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-lm3697.txt
 create mode 100644 drivers/leds/leds-lm3697.c
 create mode 100644 drivers/leds/leds-ti-lmu-common.c
 create mode 100644 include/linux/leds-ti-lmu-common.h

-- 
2.21.0.5.gaeb582a983

[PATCH v4 1/7] dt-bindings: mfd: LMU: Fix lm3632 dt binding example

[Dan Murphy]

Fix the lm3632 dt binding examples as the LCM enable GPIOs
are defined as enable GPIOs per the regulator/lm363x-regulator.txt
bindings document.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dan Murphy <dmurphy@ti.com>
---

v4 - No changes - https://lore.kernel.org/patchwork/patch/1068613/

v3 - No changes added Reviewed-by Rob - https://lore.kernel.org/patchwork/patch/1058757/
v2 - There was no v2 I add this patch on top of this series

 Documentation/devicetree/bindings/mfd/ti-lmu.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/mfd/ti-lmu.txt b/Documentation/devicetree/bindings/mfd/ti-lmu.txt
index 980394d701a7..86ca786d54fc 100644
--- a/Documentation/devicetree/bindings/mfd/ti-lmu.txt
+++ b/Documentation/devicetree/bindings/mfd/ti-lmu.txt
@@ -104,8 +104,8 @@ lm3632@11 {
 	regulators {
 		compatible = "ti,lm363x-regulator";
 
-		ti,lcm-en1-gpio = <&pioC 0 GPIO_ACTIVE_HIGH>; /* PC0 */
-		ti,lcm-en2-gpio = <&pioC 1 GPIO_ACTIVE_HIGH>; /* PC1 */
+		enable-gpios = <&pioC 0 GPIO_ACTIVE_HIGH>,
+			       <&pioC 1 GPIO_ACTIVE_HIGH>;
 
 		vboost {
 			regulator-name = "lcd_boost";
-- 
2.21.0.5.gaeb582a983

Re: [PATCH v4 1/7] dt-bindings: mfd: LMU: Fix lm3632 dt binding example

[Lee Jones]

On Mon, 06 May 2019, Dan Murphy wrote:

> Fix the lm3632 dt binding examples as the LCM enable GPIOs
> are defined as enable GPIOs per the regulator/lm363x-regulator.txt
> bindings document.
> 
> Reviewed-by: Rob Herring <robh@kernel.org>
> Signed-off-by: Dan Murphy <dmurphy@ti.com>

For my own reference:
  Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

[PATCH v4 2/7] dt-bindings: mfd: LMU: Add the ramp up/down property

[Dan Murphy]

Document the ramp-up and ramp-down property in the binding.
Removing the "sec" from the property definition as seconds is
implied.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dan Murphy <dmurphy@ti.com>
---

v4 - Change property->properties, changed ramp-up/down-ms to ramp-up/down-us -
https://lore.kernel.org/patchwork/patch/1068614/

v3 - No changes added Reviewed-by Rob - https://lore.kernel.org/patchwork/patch/1058759/
v2 - Fixed commit message as this was not just a modification but adding documentation
https://lore.kernel.org/patchwork/patch/1054504/

 .../devicetree/bindings/mfd/ti-lmu.txt        | 22 ++++++++++++-------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/Documentation/devicetree/bindings/mfd/ti-lmu.txt b/Documentation/devicetree/bindings/mfd/ti-lmu.txt
index 86ca786d54fc..160eb0a5e21a 100644
--- a/Documentation/devicetree/bindings/mfd/ti-lmu.txt
+++ b/Documentation/devicetree/bindings/mfd/ti-lmu.txt
@@ -23,8 +23,14 @@ Required properties:
          0x36 for LM3633, LM3697
          0x63 for LM3695
 
-Optional property:
+Optional properties:
   - enable-gpios: A GPIO specifier for hardware enable pin.
+  - ramp-up-us: Current ramping from one brightness level to
+		the a higher brightness level.
+		Range from 2048 us - 117.44 s
+  - ramp-down-us: Current ramping from one brightness level to
+		  the a lower brightness level.
+		  Range from 2048 us - 117.44 s
 
 Required node:
   - backlight: All LMU devices have backlight child nodes.
@@ -90,7 +96,7 @@ lm3631@29 {
 
 		lcd_bl {
 			led-sources = <0 1>;
-			ramp-up-msec = <300>;
+			ramp-up-us = <300000>;
 		};
 	};
 };
@@ -152,15 +158,15 @@ lm3633@36 {
 		main {
 			label = "main_lcd";
 			led-sources = <1 2>;
-			ramp-up-msec = <500>;
-			ramp-down-msec = <500>;
+			ramp-up-us = <500000>;
+			ramp-down-us = <500000>;
 		};
 
 		front {
 			label = "front_lcd";
 			led-sources = <0>;
-			ramp-up-msec = <1000>;
-			ramp-down-msec = <0>;
+			ramp-up-us = <1000000>;
+			ramp-down-us = <0>;
 		};
 	};
 
@@ -212,8 +218,8 @@ lm3697@36 {
 
 		lcd {
 			led-sources = <0 1 2>;
-			ramp-up-msec = <200>;
-			ramp-down-msec = <200>;
+			ramp-up-us = <200000>;
+			ramp-down-us = <200000>;
 		};
 	};
 
-- 
2.21.0.5.gaeb582a983

Re: [PATCH v4 2/7] dt-bindings: mfd: LMU: Add the ramp up/down property

[Lee Jones]

On Mon, 06 May 2019, Dan Murphy wrote:

> Document the ramp-up and ramp-down property in the binding.
> Removing the "sec" from the property definition as seconds is
> implied.
> 
> Reviewed-by: Rob Herring <robh@kernel.org>
> Signed-off-by: Dan Murphy <dmurphy@ti.com>

For my own reference:
  Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

[PATCH v4 3/7] dt-bindings: mfd: LMU: Add ti,brightness-resolution

[Dan Murphy]

Add ti,brightness-resolution to the TI LMU binding to define
whether the device uses 8-bit brightness or 11-bit brightness.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dan Murphy <dmurphy@ti.com>
---

v4 - No changes - https://lore.kernel.org/patchwork/patch/1068617/

v3 - No changes added Reviewed-by Rob - https://lore.kernel.org/patchwork/patch/1058763/
v2 - New patch.  Add brightness resolution to ti-lmu.txt.  See patch comments
for context. - https://lore.kernel.org/patchwork/patch/1054501/


 Documentation/devicetree/bindings/mfd/ti-lmu.txt | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/ti-lmu.txt b/Documentation/devicetree/bindings/mfd/ti-lmu.txt
index 160eb0a5e21a..e3efefb194c5 100644
--- a/Documentation/devicetree/bindings/mfd/ti-lmu.txt
+++ b/Documentation/devicetree/bindings/mfd/ti-lmu.txt
@@ -31,6 +31,16 @@ Optional properties:
   - ramp-down-us: Current ramping from one brightness level to
 		  the a lower brightness level.
 		  Range from 2048 us - 117.44 s
+  - ti,brightness-resolution - This determines whether to use 8 bit brightness
+			       mode or 11 bit brightness mode.  If this value is
+			       not set the device is defaulted to the preferred
+			       8bit brightness mode per 7.3.4.1 of the data
+			       sheet.  This setting can either be in the parent
+			       node or as part of the LED child nodes.  This
+			       is determined by the part itself if the strings
+			       have a common brightness register or individual
+			       brightness registers.
+			       The values are 255 (8bit) or 2047 (11bit).
 
 Required node:
   - backlight: All LMU devices have backlight child nodes.
@@ -217,6 +227,7 @@ lm3697@36 {
 		compatible = "ti,lm3697-backlight";
 
 		lcd {
+			ti,brightness-resolution = <255>;
 			led-sources = <0 1 2>;
 			ramp-up-us = <200000>;
 			ramp-down-us = <200000>;
-- 
2.21.0.5.gaeb582a983

Re: [PATCH v4 3/7] dt-bindings: mfd: LMU: Add ti,brightness-resolution

[Lee Jones]

On Mon, 06 May 2019, Dan Murphy wrote:

> Add ti,brightness-resolution to the TI LMU binding to define
> whether the device uses 8-bit brightness or 11-bit brightness.
> 
> Reviewed-by: Rob Herring <robh@kernel.org>
> Signed-off-by: Dan Murphy <dmurphy@ti.com>

For my own reference:
  Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

[PATCH v4 4/7] leds: TI LMU: Add common code for TI LMU devices

[Dan Murphy]

Create a TI LMU common framework for TI LMU devices that share
common features.

Currently the runtime ramp and brightness setting have
been identified as common features with common register settings.

This work is derived from Milo Kims TI LMU MFD code.

Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Dan Murphy <dmurphy@ti.com>
---

v4 - Renamed the files from ti-lmu-led-common to leds-ti-lmu-common, updated the
ramp-up/down variable from ms->us, fixed Kconfig, updated common header name -
https://lore.kernel.org/patchwork/patch/1068615/

v3 - No changes - https://lore.kernel.org/patchwork/patch/1058764/
v2 - Added support for the brightness resolution parameter as it is a global
parameter for all LMU devices, no other changes were made -
https://lore.kernel.org/patchwork/patch/1054500/

 drivers/leds/Kconfig               |   8 ++
 drivers/leds/Makefile              |   1 +
 drivers/leds/leds-ti-lmu-common.c  | 156 +++++++++++++++++++++++++++++
 include/linux/leds-ti-lmu-common.h |  47 +++++++++
 4 files changed, 212 insertions(+)
 create mode 100644 drivers/leds/leds-ti-lmu-common.c
 create mode 100644 include/linux/leds-ti-lmu-common.h

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index da00b9ed5a5c..a88dad3be96c 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -776,6 +776,14 @@ config LEDS_NIC78BX
 	  To compile this driver as a module, choose M here: the module
 	  will be called leds-nic78bx.
 
+config LEDS_TI_LMU_COMMON
+	tristate "LED driver for TI LMU"
+	depends on REGMAP
+	help
+	  Say Y to enable the LED driver for TI LMU devices.
+	  This supports common features between the TI LM3532, LM3631, LM3632,
+	  LM3633, LM3695 and LM3697.
+
 comment "LED Triggers"
 source "drivers/leds/trigger/Kconfig"
 
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 7a8b1f55d459..9d7cdd363603 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -80,6 +80,7 @@ obj-$(CONFIG_LEDS_MT6323)		+= leds-mt6323.o
 obj-$(CONFIG_LEDS_LM3692X)		+= leds-lm3692x.o
 obj-$(CONFIG_LEDS_SC27XX_BLTC)		+= leds-sc27xx-bltc.o
 obj-$(CONFIG_LEDS_LM3601X)		+= leds-lm3601x.o
+obj-$(CONFIG_LEDS_TI_LMU_COMMON)	+= leds-ti-lmu-common.o
 
 # LED SPI Drivers
 obj-$(CONFIG_LEDS_CR0014114)		+= leds-cr0014114.o
diff --git a/drivers/leds/leds-ti-lmu-common.c b/drivers/leds/leds-ti-lmu-common.c
new file mode 100644
index 000000000000..adc7293004f1
--- /dev/null
+++ b/drivers/leds/leds-ti-lmu-common.c
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright 2015 Texas Instruments
+// Copyright 2018 Sebastian Reichel
+// Copyright 2018 Pavel Machek <pavel@ucw.cz>
+// TI LMU LED common framework, based on previous work from
+// Milo Kim <milo.kim@ti.com>
+
+#include <linux/bitops.h>
+#include <linux/err.h>
+#include <linux/of_device.h>
+
+#include <linux/leds-ti-lmu-common.h>
+
+const static int ramp_table[16] = {2048, 262000, 524000, 1049000, 2090000,
+				4194000, 8389000, 16780000, 33550000, 41940000,
+				50330000, 58720000, 67110000, 83880000,
+				100660000, 117440000};
+
+static int ti_lmu_common_update_brightness(struct ti_lmu_bank *lmu_bank,
+					   int brightness)
+{
+	struct regmap *regmap = lmu_bank->regmap;
+	u8 reg, val;
+	int ret;
+
+	/*
+	 * 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 (lmu_bank->max_brightness == MAX_BRIGHTNESS_11BIT) {
+		reg = lmu_bank->lsb_brightness_reg;
+		ret = regmap_update_bits(regmap, reg,
+					 LMU_11BIT_LSB_MASK,
+					 brightness);
+		if (ret)
+			return ret;
+
+		val = brightness >> LMU_11BIT_MSB_SHIFT;
+	} else {
+		val = brightness;
+	}
+
+	reg = lmu_bank->msb_brightness_reg;
+
+	return regmap_write(regmap, reg, val);
+}
+
+int ti_lmu_common_set_brightness(struct ti_lmu_bank *lmu_bank, int brightness)
+{
+	return ti_lmu_common_update_brightness(lmu_bank, brightness);
+}
+EXPORT_SYMBOL(ti_lmu_common_set_brightness);
+
+static int ti_lmu_common_convert_ramp_to_index(unsigned int usec)
+{
+	int size = ARRAY_SIZE(ramp_table);
+	int i;
+
+	if (usec <= ramp_table[0])
+		return 0;
+
+	if (usec > ramp_table[size - 1])
+		return size - 1;
+
+	for (i = 1; i < size; i++) {
+		if (usec == ramp_table[i])
+			return i;
+
+		/* Find an approximate index by looking up the table */
+		if (usec > ramp_table[i - 1] && usec < ramp_table[i]) {
+			if (usec - ramp_table[i - 1] < ramp_table[i] - usec)
+				return i - 1;
+			else
+				return i;
+		}
+	}
+
+	return -EINVAL;
+}
+
+int ti_lmu_common_set_ramp(struct ti_lmu_bank *lmu_bank)
+{
+	struct regmap *regmap = lmu_bank->regmap;
+	u8 ramp, ramp_up, ramp_down;
+
+	if (lmu_bank->ramp_up_usec == 0 && lmu_bank->ramp_down_usec == 0) {
+		ramp_up = 0;
+		ramp_down = 0;
+	} else {
+		ramp_up = ti_lmu_common_convert_ramp_to_index(lmu_bank->ramp_up_usec);
+		ramp_down = ti_lmu_common_convert_ramp_to_index(lmu_bank->ramp_down_usec);
+	}
+
+	if (ramp_up < 0 || ramp_down < 0)
+		return -EINVAL;
+
+	ramp = (ramp_up << 4) | ramp_down;
+
+	return regmap_write(regmap, lmu_bank->runtime_ramp_reg, ramp);
+
+}
+EXPORT_SYMBOL(ti_lmu_common_set_ramp);
+
+int ti_lmu_common_get_ramp_params(struct device *dev,
+				  struct fwnode_handle *child,
+				  struct ti_lmu_bank *lmu_data)
+{
+	int ret;
+
+	ret = fwnode_property_read_u32(child, "ramp-up-us",
+				 &lmu_data->ramp_up_usec);
+	if (ret)
+		dev_warn(dev, "ramp-up-us property missing\n");
+
+
+	ret = fwnode_property_read_u32(child, "ramp-down-us",
+				 &lmu_data->ramp_down_usec);
+	if (ret)
+		dev_warn(dev, "ramp-down-us property missing\n");
+
+	return 0;
+}
+EXPORT_SYMBOL(ti_lmu_common_get_ramp_params);
+
+int ti_lmu_common_get_brt_res(struct device *dev, struct fwnode_handle *child,
+				  struct ti_lmu_bank *lmu_data)
+{
+	int ret;
+
+	ret = device_property_read_u32(dev, "ti,brightness-resolution",
+				       &lmu_data->max_brightness);
+	if (ret)
+		ret = fwnode_property_read_u32(child,
+					       "ti,brightness-resolution",
+					       &lmu_data->max_brightness);
+	if (lmu_data->max_brightness <= 0) {
+		lmu_data->max_brightness = MAX_BRIGHTNESS_8BIT;
+		return ret;
+	}
+
+	if (lmu_data->max_brightness > MAX_BRIGHTNESS_11BIT)
+			lmu_data->max_brightness = MAX_BRIGHTNESS_11BIT;
+
+
+	return 0;
+}
+EXPORT_SYMBOL(ti_lmu_common_get_brt_res);
+
+MODULE_DESCRIPTION("TI LMU common LED framework");
+MODULE_AUTHOR("Sebastian Reichel");
+MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("ti-lmu-led-common");
diff --git a/include/linux/leds-ti-lmu-common.h b/include/linux/leds-ti-lmu-common.h
new file mode 100644
index 000000000000..5eb111f38803
--- /dev/null
+++ b/include/linux/leds-ti-lmu-common.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+// TI LMU Common Core
+// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+
+#ifndef _TI_LMU_COMMON_H_
+#define _TI_LMU_COMMON_H_
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <uapi/linux/uleds.h>
+
+#define LMU_11BIT_LSB_MASK	(BIT(0) | BIT(1) | BIT(2))
+#define LMU_11BIT_MSB_SHIFT	3
+
+#define MAX_BRIGHTNESS_8BIT	255
+#define MAX_BRIGHTNESS_11BIT	2047
+
+struct ti_lmu_bank {
+	struct regmap *regmap;
+
+	int max_brightness;
+
+	u8 lsb_brightness_reg;
+	u8 msb_brightness_reg;
+
+	u8 runtime_ramp_reg;
+	u32 ramp_up_usec;
+	u32 ramp_down_usec;
+};
+
+int ti_lmu_common_set_brightness(struct ti_lmu_bank *lmu_bank, int brightness);
+
+int ti_lmu_common_set_ramp(struct ti_lmu_bank *lmu_bank);
+
+int ti_lmu_common_get_ramp_params(struct device *dev,
+				  struct fwnode_handle *child,
+				  struct ti_lmu_bank *lmu_data);
+
+int ti_lmu_common_get_brt_res(struct device *dev, struct fwnode_handle *child,
+			      struct ti_lmu_bank *lmu_data);
+
+#endif /* _TI_LMU_COMMON_H_ */
-- 
2.21.0.5.gaeb582a983

[PATCH v4 5/7] dt-bindings: ti-lmu: Modify dt bindings for the LM3697

[Dan Murphy]

The LM3697 is a single function LED driver. The single function LED
driver needs to reside in the LED directory as a dedicated LED driver
and not as a MFD device.  The device does have common brightness and ramp
features and those can be accomodated by a TI LMU framework.

The LM3697 dt binding needs to be moved from the ti-lmu.txt and a dedicated
LED dt binding needs to be added.  The new LM3697 LED dt binding will then
reside in the Documentation/devicetree/bindings/leds directory and follow the
current LED and general bindings guidelines.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dan Murphy <dmurphy@ti.com>
---

v4 - Made assiciated ramp bindings changes and capitalization issue otherwise
no change - https://lore.kernel.org/patchwork/patch/1068618/

v3 - No changes added Reviewed-by Rob - https://lore.kernel.org/patchwork/patch/1058762/
v2 - Made changes to reference ti,brightness-resolution to the ti-lmu.txt -
https://lore.kernel.org/patchwork/patch/1054501/

 .../devicetree/bindings/leds/leds-lm3697.txt  | 73 +++++++++++++++++++
 .../devicetree/bindings/mfd/ti-lmu.txt        | 27 +------
 2 files changed, 74 insertions(+), 26 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-lm3697.txt

diff --git a/Documentation/devicetree/bindings/leds/leds-lm3697.txt b/Documentation/devicetree/bindings/leds/leds-lm3697.txt
new file mode 100644
index 000000000000..63992d732959
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-lm3697.txt
@@ -0,0 +1,73 @@
+* Texas Instruments - LM3697 Highly Efficient White LED Driver
+
+The LM3697 11-bit LED driver provides high-
+performance backlight dimming for 1, 2, or 3 series
+LED strings while delivering up to 90% efficiency.
+
+This device is suitable for display and keypad lighting
+
+Required properties:
+	- compatible:
+		"ti,lm3697"
+	- reg :  I2C slave address
+	- #address-cells : 1
+	- #size-cells : 0
+
+Optional properties:
+	- enable-gpios : GPIO pin to enable/disable the device
+	- vled-supply : LED supply
+
+Required child properties:
+	- reg : 0 - LED is Controlled by bank A
+		1 - LED is Controlled by bank B
+	- led-sources : Indicates which HVLED string is associated to which
+			control bank.  This is a zero based property so
+			HVLED1 = 0, HVLED2 = 1, HVLED3 = 2.
+			Additional information is contained
+			in Documentation/devicetree/bindings/leds/common.txt
+
+Optional child properties:
+	- ti,brightness-resolution - see Documentation/devicetree/bindings/mfd/ti-lmu.txt
+	- ramp-up-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
+	- ramp-down-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
+	- label : see Documentation/devicetree/bindings/leds/common.txt
+	- linux,default-trigger :
+	   see Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+
+HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is
+controlled by control bank B.
+
+led-controller@36 {
+	compatible = "ti,lm3697";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	reg = <0x36>;
+
+	enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
+	vled-supply = <&vbatt>;
+
+	led@0 {
+		reg = <0>;
+		led-sources = <0 2>;
+		ti,brightness-resolution = <2047>;
+		ramp-up-us = <5000>;
+		ramp-down-us = <1000>;
+		label = "white:first_backlight_cluster";
+		linux,default-trigger = "backlight";
+	};
+
+	led@1 {
+		reg = <1>;
+		led-sources = <1>;
+		ti,brightness-resolution = <255>;
+		ramp-up-us = <500>;
+		ramp-down-us = <1000>;
+		label = "white:second_backlight_cluster";
+		linux,default-trigger = "backlight";
+	};
+}
+
+For more product information please see the link below:
+http://www.ti.com/lit/ds/symlink/lm3697.pdf
diff --git a/Documentation/devicetree/bindings/mfd/ti-lmu.txt b/Documentation/devicetree/bindings/mfd/ti-lmu.txt
index e3efefb194c5..782d3c9812ed 100644
--- a/Documentation/devicetree/bindings/mfd/ti-lmu.txt
+++ b/Documentation/devicetree/bindings/mfd/ti-lmu.txt
@@ -8,7 +8,6 @@ TI LMU driver supports lighting devices below.
   LM3632       Backlight and regulator
   LM3633       Backlight, LED and fault monitor
   LM3695       Backlight
-  LM3697       Backlight and fault monitor
 
 Required properties:
   - compatible: Should be one of:
@@ -16,11 +15,10 @@ Required properties:
                 "ti,lm3632"
                 "ti,lm3633"
                 "ti,lm3695"
-                "ti,lm3697"
   - reg: I2C slave address.
          0x11 for LM3632
          0x29 for LM3631
-         0x36 for LM3633, LM3697
+         0x36 for LM3633
          0x63 for LM3695
 
 Optional properties:
@@ -51,7 +49,6 @@ Optional nodes:
     Required properties:
       - compatible: Should be one of:
                     "ti,lm3633-fault-monitor"
-                    "ti,lm3697-fault-monitor"
   - leds: LED properties for LM3633. Please refer to [2].
   - regulators: Regulator properties for LM3631 and LM3632.
                 Please refer to [3].
@@ -216,25 +213,3 @@ lm3695@63 {
 		};
 	};
 };
-
-lm3697@36 {
-	compatible = "ti,lm3697";
-	reg = <0x36>;
-
-	enable-gpios = <&pioC 2 GPIO_ACTIVE_HIGH>;
-
-	backlight {
-		compatible = "ti,lm3697-backlight";
-
-		lcd {
-			ti,brightness-resolution = <255>;
-			led-sources = <0 1 2>;
-			ramp-up-us = <200000>;
-			ramp-down-us = <200000>;
-		};
-	};
-
-	fault-monitor {
-		compatible = "ti,lm3697-fault-monitor";
-	};
-};
-- 
2.21.0.5.gaeb582a983

Re: [PATCH v4 5/7] dt-bindings: ti-lmu: Modify dt bindings for the LM3697

[Lee Jones]

On Mon, 06 May 2019, Dan Murphy wrote:

> The LM3697 is a single function LED driver. The single function LED
> driver needs to reside in the LED directory as a dedicated LED driver
> and not as a MFD device.  The device does have common brightness and ramp
> features and those can be accomodated by a TI LMU framework.
> 
> The LM3697 dt binding needs to be moved from the ti-lmu.txt and a dedicated
> LED dt binding needs to be added.  The new LM3697 LED dt binding will then
> reside in the Documentation/devicetree/bindings/leds directory and follow the
> current LED and general bindings guidelines.
> 
> Reviewed-by: Rob Herring <robh@kernel.org>
> Signed-off-by: Dan Murphy <dmurphy@ti.com>
> ---
> 
> v4 - Made assiciated ramp bindings changes and capitalization issue otherwise
> no change - https://lore.kernel.org/patchwork/patch/1068618/
> 
> v3 - No changes added Reviewed-by Rob - https://lore.kernel.org/patchwork/patch/1058762/
> v2 - Made changes to reference ti,brightness-resolution to the ti-lmu.txt -
> https://lore.kernel.org/patchwork/patch/1054501/
> 
>  .../devicetree/bindings/leds/leds-lm3697.txt  | 73 +++++++++++++++++++

>  .../devicetree/bindings/mfd/ti-lmu.txt        | 27 +------

For my own reference:
  Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

[PATCH v4 6/7] mfd: ti-lmu: Remove support for LM3697

[Dan Murphy]

Remove support for the LM3697 from the ti-lmu driver in favor of a
dedicated LED driver.

Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Dan Murphy <dmurphy@ti.com>
---

v4 - No changes - https://lore.kernel.org/patchwork/patch/1068620/

v3 - No changes - https://lore.kernel.org/patchwork/patch/1058760/
v2 - Fixed commit message LF, removed leds/Kconfig from patch. -
https://lore.kernel.org/patchwork/patch/1054502/

 drivers/mfd/Kconfig                 |  2 +-
 drivers/mfd/ti-lmu.c                | 17 -----------
 include/linux/mfd/ti-lmu-register.h | 44 -----------------------------
 include/linux/mfd/ti-lmu.h          |  1 -
 4 files changed, 1 insertion(+), 63 deletions(-)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 26ad6468d13a..fcae244229b3 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1312,7 +1312,7 @@ config MFD_TI_LMU
 	help
 	  Say yes here to enable support for TI LMU chips.
 
-	  TI LMU MFD supports LM3532, LM3631, LM3632, LM3633, LM3695 and LM3697.
+	  TI LMU MFD supports LM3532, LM3631, LM3632, LM3633, and LM3695.
 	  It consists of backlight, LED and regulator driver.
 	  It provides consistent device controls for lighting functions.
 
diff --git a/drivers/mfd/ti-lmu.c b/drivers/mfd/ti-lmu.c
index b06cb908d1aa..89b1c5b584af 100644
--- a/drivers/mfd/ti-lmu.c
+++ b/drivers/mfd/ti-lmu.c
@@ -111,20 +111,6 @@ static const struct mfd_cell lm3695_devices[] = {
 	},
 };
 
-static const struct mfd_cell lm3697_devices[] = {
-	{
-		.name          = "ti-lmu-backlight",
-		.id            = LM3697,
-		.of_compatible = "ti,lm3697-backlight",
-	},
-	/* Monitoring driver for open/short circuit detection */
-	{
-		.name          = "ti-lmu-fault-monitor",
-		.id            = LM3697,
-		.of_compatible = "ti,lm3697-fault-monitor",
-	},
-};
-
 #define TI_LMU_DATA(chip, max_reg)		\
 static const struct ti_lmu_data chip##_data =	\
 {						\
@@ -137,7 +123,6 @@ TI_LMU_DATA(lm3631, LM3631_MAX_REG);
 TI_LMU_DATA(lm3632, LM3632_MAX_REG);
 TI_LMU_DATA(lm3633, LM3633_MAX_REG);
 TI_LMU_DATA(lm3695, LM3695_MAX_REG);
-TI_LMU_DATA(lm3697, LM3697_MAX_REG);
 
 static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 {
@@ -206,7 +191,6 @@ static const struct of_device_id ti_lmu_of_match[] = {
 	{ .compatible = "ti,lm3632", .data = &lm3632_data },
 	{ .compatible = "ti,lm3633", .data = &lm3633_data },
 	{ .compatible = "ti,lm3695", .data = &lm3695_data },
-	{ .compatible = "ti,lm3697", .data = &lm3697_data },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, ti_lmu_of_match);
@@ -216,7 +200,6 @@ static const struct i2c_device_id ti_lmu_ids[] = {
 	{ "lm3632", LM3632 },
 	{ "lm3633", LM3633 },
 	{ "lm3695", LM3695 },
-	{ "lm3697", LM3697 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);
diff --git a/include/linux/mfd/ti-lmu-register.h b/include/linux/mfd/ti-lmu-register.h
index f09510561a55..76998b01764b 100644
--- a/include/linux/mfd/ti-lmu-register.h
+++ b/include/linux/mfd/ti-lmu-register.h
@@ -189,48 +189,4 @@
 #define LM3695_REG_BRT_MSB			0x14
 
 #define LM3695_MAX_REG				0x14
-
-/* LM3697 */
-#define LM3697_REG_HVLED_OUTPUT_CFG		0x10
-#define LM3697_HVLED1_CFG_MASK			BIT(0)
-#define LM3697_HVLED2_CFG_MASK			BIT(1)
-#define LM3697_HVLED3_CFG_MASK			BIT(2)
-#define LM3697_HVLED1_CFG_SHIFT			0
-#define LM3697_HVLED2_CFG_SHIFT			1
-#define LM3697_HVLED3_CFG_SHIFT			2
-
-#define LM3697_REG_BL0_RAMP			0x11
-#define LM3697_REG_BL1_RAMP			0x12
-#define LM3697_RAMPUP_MASK			0xF0
-#define LM3697_RAMPUP_SHIFT			4
-#define LM3697_RAMPDN_MASK			0x0F
-#define LM3697_RAMPDN_SHIFT			0
-
-#define LM3697_REG_RAMP_CONF			0x14
-#define LM3697_RAMP_MASK			0x0F
-#define LM3697_RAMP_EACH			0x05
-
-#define LM3697_REG_PWM_CFG			0x1C
-#define LM3697_PWM_A_MASK			BIT(0)
-#define LM3697_PWM_B_MASK			BIT(1)
-
-#define LM3697_REG_IMAX_A			0x17
-#define LM3697_REG_IMAX_B			0x18
-
-#define LM3697_REG_FEEDBACK_ENABLE		0x19
-
-#define LM3697_REG_BRT_A_LSB			0x20
-#define LM3697_REG_BRT_A_MSB			0x21
-#define LM3697_REG_BRT_B_LSB			0x22
-#define LM3697_REG_BRT_B_MSB			0x23
-
-#define LM3697_REG_ENABLE			0x24
-
-#define LM3697_REG_OPEN_FAULT_STATUS		0xB0
-
-#define LM3697_REG_SHORT_FAULT_STATUS		0xB2
-
-#define LM3697_REG_MONITOR_ENABLE		0xB4
-
-#define LM3697_MAX_REG				0xB4
 #endif
diff --git a/include/linux/mfd/ti-lmu.h b/include/linux/mfd/ti-lmu.h
index 7762c1bce55d..54e9d272e81c 100644
--- a/include/linux/mfd/ti-lmu.h
+++ b/include/linux/mfd/ti-lmu.h
@@ -26,7 +26,6 @@ enum ti_lmu_id {
 	LM3632,
 	LM3633,
 	LM3695,
-	LM3697,
 	LMU_MAX_ID,
 };
 
-- 
2.21.0.5.gaeb582a983

[PATCH v4 7/7] leds: lm3697: Introduce the lm3697 driver

[Dan Murphy]

Introduce the lm3697 LED driver for backlighting and display.

Datasheet location:
http://www.ti.com/lit/ds/symlink/lm3697.pdf

Signed-off-by: Dan Murphy <dmurphy@ti.com>
---

v4 - Updated common header name - https://lore.kernel.org/patchwork/patch/1068619/

v3 - Moved TI_COMMON_LMU flag above LM3697 flag for inheritance also fixed removed
REGMAP dependency - v1 comments https://lore.kernel.org/patchwork/patch/1054503/
v2 comments https://lore.kernel.org/patchwork/patch/1058761/

v2 - Made changes to get max_brightness from ti_lmu common code, fixed commit
message extra LF otherwise no additional changes - https://lore.kernel.org/patchwork/patch/1054503/

 drivers/leds/Kconfig       |   7 +
 drivers/leds/Makefile      |   1 +
 drivers/leds/leds-lm3697.c | 395 +++++++++++++++++++++++++++++++++++++
 3 files changed, 403 insertions(+)
 create mode 100644 drivers/leds/leds-lm3697.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index a88dad3be96c..255fdd5e8491 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -784,6 +784,13 @@ config LEDS_TI_LMU_COMMON
 	  This supports common features between the TI LM3532, LM3631, LM3632,
 	  LM3633, LM3695 and LM3697.
 
+config LEDS_LM3697
+	tristate "LED driver for LM3697"
+	depends on LEDS_TI_LMU_COMMON
+	help
+	  Say Y to enable the LM3697 LED driver for TI LMU devices.
+	  This supports the LED device LM3697.
+
 comment "LED Triggers"
 source "drivers/leds/trigger/Kconfig"
 
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 9d7cdd363603..8ab825c8b5c3 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -81,6 +81,7 @@ obj-$(CONFIG_LEDS_LM3692X)		+= leds-lm3692x.o
 obj-$(CONFIG_LEDS_SC27XX_BLTC)		+= leds-sc27xx-bltc.o
 obj-$(CONFIG_LEDS_LM3601X)		+= leds-lm3601x.o
 obj-$(CONFIG_LEDS_TI_LMU_COMMON)	+= leds-ti-lmu-common.o
+obj-$(CONFIG_LEDS_LM3697)		+= leds-lm3697.o
 
 # LED SPI Drivers
 obj-$(CONFIG_LEDS_CR0014114)		+= leds-cr0014114.o
diff --git a/drivers/leds/leds-lm3697.c b/drivers/leds/leds-lm3697.c
new file mode 100644
index 000000000000..54e0e35df824
--- /dev/null
+++ b/drivers/leds/leds-lm3697.c
@@ -0,0 +1,395 @@
+// SPDX-License-Identifier: GPL-2.0
+// TI LM3697 LED chip family driver
+// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/regulator/consumer.h>
+#include <linux/leds-ti-lmu-common.h>
+
+#define LM3697_REV			0x0
+#define LM3697_RESET			0x1
+#define LM3697_OUTPUT_CONFIG		0x10
+#define LM3697_CTRL_A_RAMP		0x11
+#define LM3697_CTRL_B_RAMP		0x12
+#define LM3697_CTRL_A_B_RT_RAMP		0x13
+#define LM3697_CTRL_A_B_RAMP_CFG	0x14
+#define LM3697_CTRL_A_B_BRT_CFG		0x16
+#define LM3697_CTRL_A_FS_CURR_CFG	0x17
+#define LM3697_CTRL_B_FS_CURR_CFG	0x18
+#define LM3697_PWM_CFG			0x1c
+#define LM3697_CTRL_A_BRT_LSB		0x20
+#define LM3697_CTRL_A_BRT_MSB		0x21
+#define LM3697_CTRL_B_BRT_LSB		0x22
+#define LM3697_CTRL_B_BRT_MSB		0x23
+#define LM3697_CTRL_ENABLE		0x24
+
+#define LM3697_SW_RESET		BIT(0)
+
+#define LM3697_CTRL_A_EN	BIT(0)
+#define LM3697_CTRL_B_EN	BIT(1)
+#define LM3697_CTRL_A_B_EN	(LM3697_CTRL_A_EN | LM3697_CTRL_B_EN)
+
+#define LM3697_MAX_LED_STRINGS	3
+
+#define LM3697_CONTROL_A	0
+#define LM3697_CONTROL_B	1
+#define LM3697_MAX_CONTROL_BANKS 2
+
+/**
+ * struct lm3697_led -
+ * @hvled_strings: Array of LED strings associated with a control bank
+ * @label: LED label
+ * @led_dev: LED class device
+ * @priv: Pointer to the device struct
+ * @lmu_data: Register and setting values for common code
+ * @control_bank: Control bank the LED is associated to. 0 is control bank A
+ *		   1 is control bank B
+ */
+struct lm3697_led {
+	u32 hvled_strings[LM3697_MAX_LED_STRINGS];
+	char label[LED_MAX_NAME_SIZE];
+	struct led_classdev led_dev;
+	struct lm3697 *priv;
+	struct ti_lmu_bank lmu_data;
+	int control_bank;
+	int enabled;
+	int num_leds;
+};
+
+/**
+ * struct lm3697 -
+ * @enable_gpio: Hardware enable gpio
+ * @regulator: LED supply regulator pointer
+ * @client: Pointer to the I2C client
+ * @regmap: Devices register map
+ * @dev: Pointer to the devices device struct
+ * @lock: Lock for reading/writing the device
+ * @leds: Array of LED strings
+ */
+struct lm3697 {
+	struct gpio_desc *enable_gpio;
+	struct regulator *regulator;
+	struct i2c_client *client;
+	struct regmap *regmap;
+	struct device *dev;
+	struct mutex lock;
+
+	int bank_cfg;
+
+	struct lm3697_led leds[];
+};
+
+static const struct reg_default lm3697_reg_defs[] = {
+	{LM3697_OUTPUT_CONFIG, 0x6},
+	{LM3697_CTRL_A_RAMP, 0x0},
+	{LM3697_CTRL_B_RAMP, 0x0},
+	{LM3697_CTRL_A_B_RT_RAMP, 0x0},
+	{LM3697_CTRL_A_B_RAMP_CFG, 0x0},
+	{LM3697_CTRL_A_B_BRT_CFG, 0x0},
+	{LM3697_CTRL_A_FS_CURR_CFG, 0x13},
+	{LM3697_CTRL_B_FS_CURR_CFG, 0x13},
+	{LM3697_PWM_CFG, 0xc},
+	{LM3697_CTRL_A_BRT_LSB, 0x0},
+	{LM3697_CTRL_A_BRT_MSB, 0x0},
+	{LM3697_CTRL_B_BRT_LSB, 0x0},
+	{LM3697_CTRL_B_BRT_MSB, 0x0},
+	{LM3697_CTRL_ENABLE, 0x0},
+};
+
+static const struct regmap_config lm3697_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+
+	.max_register = LM3697_CTRL_ENABLE,
+	.reg_defaults = lm3697_reg_defs,
+	.num_reg_defaults = ARRAY_SIZE(lm3697_reg_defs),
+	.cache_type = REGCACHE_FLAT,
+};
+
+static int lm3697_brightness_set(struct led_classdev *led_cdev,
+				enum led_brightness brt_val)
+{
+	struct lm3697_led *led = container_of(led_cdev, struct lm3697_led,
+					      led_dev);
+	int ctrl_en_val = (1 << led->control_bank);
+	int ret;
+
+	mutex_lock(&led->priv->lock);
+
+	if (brt_val == LED_OFF) {
+		ret = regmap_update_bits(led->priv->regmap, LM3697_CTRL_ENABLE,
+					 ctrl_en_val, ~ctrl_en_val);
+		if (ret) {
+			dev_err(&led->priv->client->dev, "Cannot write ctrl register\n");
+			goto brightness_out;
+		}
+
+		led->enabled = LED_OFF;
+	} else {
+		ret = ti_lmu_common_set_brightness(&led->lmu_data, brt_val);
+		if (ret) {
+			dev_err(&led->priv->client->dev,
+				"Cannot write brightness\n");
+			goto brightness_out;
+		}
+
+		if (!led->enabled) {
+			ret = regmap_update_bits(led->priv->regmap,
+						 LM3697_CTRL_ENABLE,
+						 ctrl_en_val, ctrl_en_val);
+			if (ret) {
+				dev_err(&led->priv->client->dev,
+					"Cannot enable the device\n");
+				goto brightness_out;
+			}
+
+			led->enabled = brt_val;
+		}
+	}
+
+brightness_out:
+	mutex_unlock(&led->priv->lock);
+	return ret;
+}
+
+static int lm3697_init(struct lm3697 *priv)
+{
+	struct lm3697_led *led;
+	int i, ret;
+
+	if (priv->enable_gpio) {
+		gpiod_direction_output(priv->enable_gpio, 1);
+	} else {
+		ret = regmap_write(priv->regmap, LM3697_RESET, LM3697_SW_RESET);
+		if (ret) {
+			dev_err(&priv->client->dev, "Cannot reset the device\n");
+			goto out;
+		}
+	}
+
+	ret = regmap_write(priv->regmap, LM3697_CTRL_ENABLE, 0x0);
+	if (ret) {
+		dev_err(&priv->client->dev, "Cannot write ctrl enable\n");
+		goto out;
+	}
+
+	ret = regmap_write(priv->regmap, LM3697_OUTPUT_CONFIG, priv->bank_cfg);
+	if (ret)
+		dev_err(&priv->client->dev, "Cannot write OUTPUT config\n");
+
+	for (i = 0; i < LM3697_MAX_CONTROL_BANKS; i++) {
+		led = &priv->leds[i];
+		ret = ti_lmu_common_set_ramp(&led->lmu_data);
+		if (ret)
+			dev_err(&priv->client->dev, "Setting the ramp rate failed\n");
+	}
+out:
+	return ret;
+}
+
+static int lm3697_probe_dt(struct lm3697 *priv)
+{
+	struct fwnode_handle *child = NULL;
+	struct lm3697_led *led;
+	const char *name;
+	int control_bank;
+	size_t i = 0;
+	int ret = -EINVAL;
+	int j;
+
+	priv->enable_gpio = devm_gpiod_get_optional(&priv->client->dev,
+						   "enable", GPIOD_OUT_LOW);
+	if (IS_ERR(priv->enable_gpio)) {
+		ret = PTR_ERR(priv->enable_gpio);
+		dev_err(&priv->client->dev, "Failed to get enable gpio: %d\n",
+			ret);
+		return ret;
+	}
+
+	priv->regulator = devm_regulator_get(&priv->client->dev, "vled");
+	if (IS_ERR(priv->regulator))
+		priv->regulator = NULL;
+
+	device_for_each_child_node(priv->dev, child) {
+		ret = fwnode_property_read_u32(child, "reg", &control_bank);
+		if (ret) {
+			dev_err(&priv->client->dev, "reg property missing\n");
+			fwnode_handle_put(child);
+			goto child_out;
+		}
+
+		if (control_bank > LM3697_CONTROL_B) {
+			dev_err(&priv->client->dev, "reg property is invalid\n");
+			ret = -EINVAL;
+			fwnode_handle_put(child);
+			goto child_out;
+		}
+
+		led = &priv->leds[i];
+
+		ret = ti_lmu_common_get_brt_res(&priv->client->dev,
+						child, &led->lmu_data);
+		if (ret)
+			dev_warn(&priv->client->dev, "brightness resolution property missing\n");
+
+		led->control_bank = control_bank;
+		led->lmu_data.regmap = priv->regmap;
+		led->lmu_data.runtime_ramp_reg = LM3697_CTRL_A_RAMP +
+						 control_bank;
+		led->lmu_data.msb_brightness_reg = LM3697_CTRL_A_BRT_MSB +
+						   led->control_bank * 2;
+		led->lmu_data.lsb_brightness_reg = LM3697_CTRL_A_BRT_LSB +
+						   led->control_bank * 2;
+
+		led->num_leds = fwnode_property_read_u32_array(child,
+						       "led-sources",
+						       NULL, 0);
+
+		if (led->num_leds > LM3697_MAX_LED_STRINGS) {
+			dev_err(&priv->client->dev, "To many LED strings defined\n");
+			continue;
+		}
+
+		ret = fwnode_property_read_u32_array(child, "led-sources",
+						    led->hvled_strings,
+						    led->num_leds);
+		if (ret) {
+			dev_err(&priv->client->dev, "led-sources property missing\n");
+			fwnode_handle_put(child);
+			goto child_out;
+		}
+
+		for (j = 0; j < led->num_leds; j++)
+			priv->bank_cfg |=
+				(led->control_bank << led->hvled_strings[j]);
+
+		ret = ti_lmu_common_get_ramp_params(&priv->client->dev,
+						    child, &led->lmu_data);
+		if (ret)
+			dev_warn(&priv->client->dev, "runtime-ramp properties missing\n");
+
+		fwnode_property_read_string(child, "linux,default-trigger",
+					    &led->led_dev.default_trigger);
+
+		ret = fwnode_property_read_string(child, "label", &name);
+		if (ret)
+			snprintf(led->label, sizeof(led->label),
+				"%s::", priv->client->name);
+		else
+			snprintf(led->label, sizeof(led->label),
+				 "%s:%s", priv->client->name, name);
+
+		led->priv = priv;
+		led->led_dev.name = led->label;
+		led->led_dev.max_brightness = led->lmu_data.max_brightness;
+		led->led_dev.brightness_set_blocking = lm3697_brightness_set;
+
+		ret = devm_led_classdev_register(priv->dev, &led->led_dev);
+		if (ret) {
+			dev_err(&priv->client->dev, "led register err: %d\n",
+				ret);
+			fwnode_handle_put(child);
+			goto child_out;
+		}
+
+		i++;
+	}
+
+child_out:
+	return ret;
+}
+
+static int lm3697_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct lm3697 *led;
+	int count;
+	int ret;
+
+	count = device_get_child_node_count(&client->dev);
+	if (!count) {
+		dev_err(&client->dev, "LEDs are not defined in device tree!");
+		return -ENODEV;
+	}
+
+	led = devm_kzalloc(&client->dev, struct_size(led, leds, count),
+			   GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	mutex_init(&led->lock);
+	i2c_set_clientdata(client, led);
+
+	led->client = client;
+	led->dev = &client->dev;
+	led->regmap = devm_regmap_init_i2c(client, &lm3697_regmap_config);
+	if (IS_ERR(led->regmap)) {
+		ret = PTR_ERR(led->regmap);
+		dev_err(&client->dev, "Failed to allocate register map: %d\n",
+			ret);
+		return ret;
+	}
+
+	ret = lm3697_probe_dt(led);
+	if (ret)
+		return ret;
+
+	return lm3697_init(led);
+}
+
+static int lm3697_remove(struct i2c_client *client)
+{
+	struct lm3697 *led = i2c_get_clientdata(client);
+	int ret;
+
+	ret = regmap_update_bits(led->regmap, LM3697_CTRL_ENABLE,
+				 LM3697_CTRL_A_B_EN, 0);
+	if (ret) {
+		dev_err(&led->client->dev, "Failed to disable the device\n");
+		return ret;
+	}
+
+	if (led->enable_gpio)
+		gpiod_direction_output(led->enable_gpio, 0);
+
+	if (led->regulator) {
+		ret = regulator_disable(led->regulator);
+		if (ret)
+			dev_err(&led->client->dev,
+				"Failed to disable regulator\n");
+	}
+
+	mutex_destroy(&led->lock);
+
+	return 0;
+}
+
+static const struct i2c_device_id lm3697_id[] = {
+	{ "lm3697", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lm3697_id);
+
+static const struct of_device_id of_lm3697_leds_match[] = {
+	{ .compatible = "ti,lm3697", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, of_lm3697_leds_match);
+
+static struct i2c_driver lm3697_driver = {
+	.driver = {
+		.name	= "lm3697",
+		.of_match_table = of_lm3697_leds_match,
+	},
+	.probe		= lm3697_probe,
+	.remove		= lm3697_remove,
+	.id_table	= lm3697_id,
+};
+module_i2c_driver(lm3697_driver);
+
+MODULE_DESCRIPTION("Texas Instruments LM3697 LED driver");
+MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
+MODULE_LICENSE("GPL v2");
-- 
2.21.0.5.gaeb582a983