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TI LMU LED support rework and introduction of two new drivers

Browse Source 
with DT bindings:
 
 - leds-lm3697
 - leds-lm36274
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Merge tag 'ti-lmu-led-drivers' into for-next

Merge immutable branch between LEDs, MFD and REGULATOR due to
TI LMU LED support rework and introduction of two new drivers
with DT bindings.

* tag 'ti-lmu-led-drivers':
  leds: lm36274: Introduce the TI LM36274 LED driver
  dt-bindings: leds: Add LED bindings for the LM36274
  regulator: lm363x: Add support for LM36274
  mfd: ti-lmu: Add LM36274 support to the ti-lmu
  dt-bindings: mfd: Add lm36274 bindings to ti-lmu
  leds: lm3697: Introduce the lm3697 driver
  mfd: ti-lmu: Remove support for LM3697
  dt-bindings: ti-lmu: Modify dt bindings for the LM3697
  leds: TI LMU: Add common code for TI LMU devices
  dt-bindings: mfd: LMU: Add ti,brightness-resolution
  dt-bindings: mfd: LMU: Add the ramp up/down property
This commit is contained in:
Jacek Anaszewski 2019-06-11 23:46:37 +02:00
commit 25529edef5
15 changed files with 1132 additions and 82 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

85
Documentation/devicetree/bindings/leds/leds-lm36274.txt Normal file
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@ -0,0 +1,85 @@
* Texas Instruments LM36274 4-Channel LCD Backlight Driver w/Integrated Bias
The LM36274 is an integrated four-channel WLED driver and LCD bias supply.
The backlight boost provides the power to bias four parallel LED strings with
up to 29V total output voltage. The 11-bit LED current is programmable via
the I2C bus and/or controlled via a logic level PWM input from 60 uA to 30 mA.
Parent device properties are documented in
Documentation/devicetree/bindings/mfd/ti_lmu.txt
Regulator properties are documented in
Documentation/devicetree/bindings/regulator/lm363x-regulator.txt
Required backlight properties:
- compatible:
"ti,lm36274-backlight"
- reg : 0
- #address-cells : 1
- #size-cells : 0
- led-sources : Indicates which LED strings will be enabled.
Values from 0-3, sources is 0 based so strings will be
source value + 1.
Optional backlight properties:
- 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.
lm36274@11 {
compatible = "ti,lm36274";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x11>;
enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
regulators {
#address-cells = <1>;
#size-cells = <0>;
compatible = "ti,lm363x-regulator";
enable-gpios = <&pioC 0 GPIO_ACTIVE_HIGH>,
<&pioC 1 GPIO_ACTIVE_HIGH>;
vboost {
regulator-name = "lcd_boost";
regulator-min-microvolt = <4000000>;
regulator-max-microvolt = <7150000>;
regulator-always-on;
};
vpos {
regulator-name = "lcd_vpos";
regulator-min-microvolt = <4000000>;
regulator-max-microvolt = <6500000>;
};
vneg {
regulator-name = "lcd_vneg";
regulator-min-microvolt = <4000000>;
regulator-max-microvolt = <6500000>;
};
};
backlight {
#address-cells = <1>;
#size-cells = <0>;
compatible = "ti,lm36274-backlight";
led@0 {
reg = <0>;
led-sources = <0 2>;
label = "white:backlight_cluster";
linux,default-trigger = "backlight";
};
};
};
For more product information please see the link below:
http://www.ti.com/lit/ds/symlink/lm36274.pdf

73
Documentation/devicetree/bindings/leds/leds-lm3697.txt Normal file
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@ -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

88
Documentation/devicetree/bindings/mfd/ti-lmu.txt
View File

@ -8,7 +8,7 @@ TI LMU driver supports lighting devices below.
LM3632 Backlight and regulator
LM3633 Backlight, LED and fault monitor
LM3695 Backlight
LM3697 Backlight and fault monitor
LM36274 Backlight and regulator
Required properties:
- compatible: Should be one of:
@ -16,15 +16,32 @@ Required properties:
"ti,lm3632"
"ti,lm3633"
"ti,lm3695"
"ti,lm3697"
"ti,lm36274"
- reg: I2C slave address.
0x11 for LM3632
0x29 for LM3631
0x36 for LM3633, LM3697
0x36 for LM3633
0x63 for LM3695
0x11 for LM36274
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
- 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.
@ -35,14 +52,15 @@ 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].
LED properties for LM36274. Please refer to [4].
- regulators: Regulator properties for LM3631 and LM3632.
Please refer to [3].
[1] ../leds/backlight/ti-lmu-backlight.txt
[2] ../leds/leds-lm3633.txt
[3] ../regulator/lm363x-regulator.txt
[4] ../leds/leds-lm36274.txt
lm3631@29 {
compatible = "ti,lm3631";
@ -90,7 +108,7 @@ lm3631@29 {
lcd_bl {
led-sources = <0 1>;
ramp-up-msec = <300>;
ramp-up-us = <300000>;
};
};
};
@ -152,15 +170,15 @@ 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>;
};
};
@ -201,23 +219,51 @@ lm3695@63 {
};
};
lm3697@36 {
compatible = "ti,lm3697";
reg = <0x36>;
lm36274@11 {
compatible = "ti,lm36274";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x11>;
enable-gpios = <&pioC 2 GPIO_ACTIVE_HIGH>;
regulators {
#address-cells = <1>;
#size-cells = <0>;
compatible = "ti,lm363x-regulator";
backlight {
compatible = "ti,lm3697-backlight";
enable-gpios = <&pioC 0 GPIO_ACTIVE_HIGH>,
<&pioC 1 GPIO_ACTIVE_HIGH>;
lcd {
led-sources = <0 1 2>;
ramp-up-msec = <200>;
ramp-down-msec = <200>;
vboost {
regulator-name = "lcd_boost";
regulator-min-microvolt = <4000000>;
regulator-max-microvolt = <7150000>;
regulator-always-on;
};
vpos {
regulator-name = "lcd_vpos";
regulator-min-microvolt = <4000000>;
regulator-max-microvolt = <6500000>;
};
vneg {
regulator-name = "lcd_vneg";
regulator-min-microvolt = <4000000>;
regulator-max-microvolt = <6500000>;
};
};
fault-monitor {
compatible = "ti,lm3697-fault-monitor";
backlight {
#address-cells = <1>;
#size-cells = <0>;
compatible = "ti,lm36274-backlight";
led@0 {
reg = <0>;
led-sources = <0 2>;
label = "white:backlight_cluster";
linux,default-trigger = "backlight";
};
};
};

25
drivers/leds/Kconfig
View File

@ -793,6 +793,31 @@ config LEDS_SPI_BYTE
for controlling the brightness. Currently the following controller is
supported: Ubiquiti airCube ISP microcontroller based LED controller.
config LEDS_TI_LMU_COMMON
tristate "LED driver for TI LMU"
depends on LEDS_CLASS
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.
config LEDS_LM3697
tristate "LED driver for LM3697"
depends on LEDS_TI_LMU_COMMON
depends on I2C && OF
help
Say Y to enable the LM3697 LED driver for TI LMU devices.
This supports the LED device LM3697.
config LEDS_LM36274
tristate "LED driver for LM36274"
depends on LEDS_TI_LMU_COMMON
depends on MFD_TI_LMU
help
Say Y to enable the LM36274 LED driver for TI LMU devices.
This supports the LED device LM36274.
comment "LED Triggers"
source "drivers/leds/trigger/Kconfig"

3
drivers/leds/Makefile
View File

@ -82,6 +82,9 @@ 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-$(CONFIG_LEDS_TI_LMU_COMMON) += leds-ti-lmu-common.o
obj-$(CONFIG_LEDS_LM3697) += leds-lm3697.o
obj-$(CONFIG_LEDS_LM36274) += leds-lm36274.o
# LED SPI Drivers
obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o

172
drivers/leds/leds-lm36274.c Normal file
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@ -0,0 +1,172 @@
// SPDX-License-Identifier: GPL-2.0
// TI LM36274 LED chip family driver
// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/leds.h>
#include <linux/leds-ti-lmu-common.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/mfd/ti-lmu.h>
#include <linux/mfd/ti-lmu-register.h>
#include <uapi/linux/uleds.h>
#define LM36274_MAX_STRINGS 4
#define LM36274_BL_EN BIT(4)
/**
* struct lm36274
* @pdev: platform device
* @led_dev: led class device
* @lmu_data: Register and setting values for common code
* @regmap: Devices register map
* @dev: Pointer to the devices device struct
* @led_sources - The LED strings supported in this array
* @num_leds - Number of LED strings are supported in this array
*/
struct lm36274 {
struct platform_device *pdev;
struct led_classdev led_dev;
struct ti_lmu_bank lmu_data;
struct regmap *regmap;
struct device *dev;
u32 led_sources[LM36274_MAX_STRINGS];
int num_leds;
};
static int lm36274_brightness_set(struct led_classdev *led_cdev,
enum led_brightness brt_val)
{
struct lm36274 *led = container_of(led_cdev, struct lm36274, led_dev);
return ti_lmu_common_set_brightness(&led->lmu_data, brt_val);
}
static int lm36274_init(struct lm36274 *lm36274_data)
{
int enable_val = 0;
int i;
for (i = 0; i < lm36274_data->num_leds; i++)
enable_val |= (1 << lm36274_data->led_sources[i]);
if (!enable_val) {
dev_err(lm36274_data->dev, "No LEDs were enabled\n");
return -EINVAL;
}
enable_val |= LM36274_BL_EN;
return regmap_write(lm36274_data->regmap, LM36274_REG_BL_EN,
enable_val);
}
static int lm36274_parse_dt(struct lm36274 *lm36274_data)
{
struct fwnode_handle *child = NULL;
char label[LED_MAX_NAME_SIZE];
struct device *dev = &lm36274_data->pdev->dev;
const char *name;
int child_cnt;
int ret = -EINVAL;
/* There should only be 1 node */
child_cnt = device_get_child_node_count(dev);
if (child_cnt != 1)
return -EINVAL;
device_for_each_child_node(dev, child) {
ret = fwnode_property_read_string(child, "label", &name);
if (ret)
snprintf(label, sizeof(label),
"%s::", lm36274_data->pdev->name);
else
snprintf(label, sizeof(label),
"%s:%s", lm36274_data->pdev->name, name);
lm36274_data->num_leds = fwnode_property_read_u32_array(child,
"led-sources",
NULL, 0);
if (lm36274_data->num_leds <= 0)
return -ENODEV;
ret = fwnode_property_read_u32_array(child, "led-sources",
lm36274_data->led_sources,
lm36274_data->num_leds);
if (ret) {
dev_err(dev, "led-sources property missing\n");
return ret;
}
fwnode_property_read_string(child, "linux,default-trigger",
&lm36274_data->led_dev.default_trigger);
}
lm36274_data->lmu_data.regmap = lm36274_data->regmap;
lm36274_data->lmu_data.max_brightness = MAX_BRIGHTNESS_11BIT;
lm36274_data->lmu_data.msb_brightness_reg = LM36274_REG_BRT_MSB;
lm36274_data->lmu_data.lsb_brightness_reg = LM36274_REG_BRT_LSB;
lm36274_data->led_dev.name = label;
lm36274_data->led_dev.max_brightness = MAX_BRIGHTNESS_11BIT;
lm36274_data->led_dev.brightness_set_blocking = lm36274_brightness_set;
return 0;
}
static int lm36274_probe(struct platform_device *pdev)
{
struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
struct lm36274 *lm36274_data;
int ret;
lm36274_data = devm_kzalloc(&pdev->dev, sizeof(*lm36274_data),
GFP_KERNEL);
if (!lm36274_data)
return -ENOMEM;
lm36274_data->pdev = pdev;
lm36274_data->dev = lmu->dev;
lm36274_data->regmap = lmu->regmap;
dev_set_drvdata(&pdev->dev, lm36274_data);
ret = lm36274_parse_dt(lm36274_data);
if (ret) {
dev_err(lm36274_data->dev, "Failed to parse DT node\n");
return ret;
}
ret = lm36274_init(lm36274_data);
if (ret) {
dev_err(lm36274_data->dev, "Failed to init the device\n");
return ret;
}
return devm_led_classdev_register(lm36274_data->dev,
&lm36274_data->led_dev);
}
static const struct of_device_id of_lm36274_leds_match[] = {
{ .compatible = "ti,lm36274-backlight", },
{},
};
MODULE_DEVICE_TABLE(of, of_lm36274_leds_match);
static struct platform_driver lm36274_driver = {
.probe = lm36274_probe,
.driver = {
.name = "lm36274-leds",
},
};
module_platform_driver(lm36274_driver)
MODULE_DESCRIPTION("Texas Instruments LM36274 LED driver");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
MODULE_LICENSE("GPL v2");

395
drivers/leds/leds-lm3697.c Normal file
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@ -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");

156
drivers/leds/leds-ti-lmu-common.c Normal file
View File

@ -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");

5
drivers/mfd/Kconfig
View File

@ -1335,9 +1335,8 @@ config MFD_TI_LMU
select REGMAP_I2C
help
Say yes here to enable support for TI LMU chips.
TI LMU MFD supports LM3532, LM3631, LM3632, LM3633, LM3695 and LM3697.
It consists of backlight, LED and regulator driver.
TI LMU MFD supports LM3532, LM3631, LM3632, LM3633, LM3695 and
LM36274. It consists of backlight, LED and regulator driver.
It provides consistent device controls for lighting functions.
config MFD_OMAP_USB_HOST

23
drivers/mfd/ti-lmu.c
View File

@ -111,17 +111,14 @@ static const struct mfd_cell lm3695_devices[] = {
},
};
static const struct mfd_cell lm3697_devices[] = {
static const struct mfd_cell lm36274_devices[] = {
LM363X_REGULATOR(LM36274_BOOST),
LM363X_REGULATOR(LM36274_LDO_POS),
LM363X_REGULATOR(LM36274_LDO_NEG),
{
.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",
.name = "lm36274-leds",
.id = LM36274,
.of_compatible = "ti,lm36274-backlight",
},
};
@ -137,7 +134,7 @@ 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);
TI_LMU_DATA(lm36274, LM36274_MAX_REG);
static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
{
@ -206,7 +203,7 @@ 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 },
{ .compatible = "ti,lm36274", .data = &lm36274_data },
{ }
};
MODULE_DEVICE_TABLE(of, ti_lmu_of_match);
@ -216,7 +213,7 @@ static const struct i2c_device_id ti_lmu_ids[] = {
{ "lm3632", LM3632 },
{ "lm3633", LM3633 },
{ "lm3695", LM3695 },
{ "lm3697", LM3697 },
{ "lm36274", LM36274 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);

2
drivers/regulator/Kconfig
View File

@ -363,7 +363,7 @@ config REGULATOR_LM363X
tristate "TI LM363X voltage regulators"
depends on MFD_TI_LMU
help
This driver supports LM3631 and LM3632 voltage regulators for
This driver supports LM3631, LM3632 and LM36274 voltage regulators for
the LCD bias.
One boost output voltage is configurable and always on.
Other LDOs are used for the display module.

78
drivers/regulator/lm363x-regulator.c
View File

@ -37,6 +37,11 @@
#define LM3632_VBOOST_MIN 4500000
#define LM3632_VLDO_MIN 4000000
/* LM36274 */
#define LM36274_BOOST_VSEL_MAX 0x3f
#define LM36274_LDO_VSEL_MAX 0x34
#define LM36274_VOLTAGE_MIN 4000000
/* Common */
#define LM363X_STEP_50mV 50000
#define LM363X_STEP_500mV 500000
@ -217,6 +222,51 @@ static const struct regulator_desc lm363x_regulator_desc[] = {
.enable_reg = LM3632_REG_BIAS_CONFIG,
.enable_mask = LM3632_EN_VNEG_MASK,
},
/* LM36274 */
{
.name = "vboost",
.of_match = "vboost",
.id = LM36274_BOOST,
.ops = &lm363x_boost_voltage_table_ops,
.n_voltages = LM36274_BOOST_VSEL_MAX,
.min_uV = LM36274_VOLTAGE_MIN,
.uV_step = LM363X_STEP_50mV,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LM36274_REG_VOUT_BOOST,
.vsel_mask = LM36274_VOUT_MASK,
},
{
.name = "ldo_vpos",
.of_match = "vpos",
.id = LM36274_LDO_POS,
.ops = &lm363x_regulator_voltage_table_ops,
.n_voltages = LM36274_LDO_VSEL_MAX,
.min_uV = LM36274_VOLTAGE_MIN,
.uV_step = LM363X_STEP_50mV,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LM36274_REG_VOUT_POS,
.vsel_mask = LM36274_VOUT_MASK,
.enable_reg = LM36274_REG_BIAS_CONFIG_1,
.enable_mask = LM36274_EN_VPOS_MASK,
},
{
.name = "ldo_vneg",
.of_match = "vneg",
.id = LM36274_LDO_NEG,
.ops = &lm363x_regulator_voltage_table_ops,
.n_voltages = LM36274_LDO_VSEL_MAX,
.min_uV = LM36274_VOLTAGE_MIN,
.uV_step = LM363X_STEP_50mV,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LM36274_REG_VOUT_NEG,
.vsel_mask = LM36274_VOUT_MASK,
.enable_reg = LM36274_REG_BIAS_CONFIG_1,
.enable_mask = LM36274_EN_VNEG_MASK,
},
};
static struct gpio_desc *lm363x_regulator_of_get_enable_gpio(struct device *dev, int id)
@ -229,9 +279,11 @@ static struct gpio_desc *lm363x_regulator_of_get_enable_gpio(struct device *dev,
*/
switch (id) {
case LM3632_LDO_POS:
case LM36274_LDO_POS:
return gpiod_get_index_optional(dev, "enable", 0,
GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
case LM3632_LDO_NEG:
case LM36274_LDO_NEG:
return gpiod_get_index_optional(dev, "enable", 1,
GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
default:
@ -239,6 +291,27 @@ static struct gpio_desc *lm363x_regulator_of_get_enable_gpio(struct device *dev,
}
}
static int lm363x_regulator_set_ext_en(struct regmap *regmap, int id)
{
int ext_en_mask = 0;
switch (id) {
case LM3632_LDO_POS:
case LM3632_LDO_NEG:
ext_en_mask = LM3632_EXT_EN_MASK;
break;
case LM36274_LDO_POS:
case LM36274_LDO_NEG:
ext_en_mask = LM36274_EXT_EN_MASK;
break;
default:
return -ENODEV;
}
return regmap_update_bits(regmap, lm363x_regulator_desc[id].enable_reg,
ext_en_mask, ext_en_mask);
}
static int lm363x_regulator_probe(struct platform_device *pdev)
{
struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
@ -263,10 +336,7 @@ static int lm363x_regulator_probe(struct platform_device *pdev)
if (gpiod) {
cfg.ena_gpiod = gpiod;
ret = regmap_update_bits(regmap, LM3632_REG_BIAS_CONFIG,
LM3632_EXT_EN_MASK,
LM3632_EXT_EN_MASK);
ret = lm363x_regulator_set_ext_en(regmap, id);
if (ret) {
gpiod_put(gpiod);
dev_err(dev, "External pin err: %d\n", ret);

47
include/linux/leds-ti-lmu-common.h Normal file
View File

@ -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_ */

57
include/linux/mfd/ti-lmu-register.h
View File

@ -190,47 +190,26 @@
#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
/* LM36274 */
#define LM36274_REG_REV 0x01
#define LM36274_REG_BL_CFG_1 0x02
#define LM36274_REG_BL_CFG_2 0x03
#define LM36274_REG_BRT_LSB 0x04
#define LM36274_REG_BRT_MSB 0x05
#define LM36274_REG_BL_EN 0x08
#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 LM36274_REG_BIAS_CONFIG_1 0x09
#define LM36274_EXT_EN_MASK BIT(0)
#define LM36274_EN_VNEG_MASK BIT(1)
#define LM36274_EN_VPOS_MASK BIT(2)
#define LM3697_REG_RAMP_CONF 0x14
#define LM3697_RAMP_MASK 0x0F
#define LM3697_RAMP_EACH 0x05
#define LM36274_REG_BIAS_CONFIG_2 0x0a
#define LM36274_REG_BIAS_CONFIG_3 0x0b
#define LM36274_REG_VOUT_BOOST 0x0c
#define LM36274_REG_VOUT_POS 0x0d
#define LM36274_REG_VOUT_NEG 0x0e
#define LM36274_VOUT_MASK 0x3F
#define LM3697_REG_PWM_CFG 0x1C
#define LM3697_PWM_A_MASK BIT(0)
#define LM3697_PWM_B_MASK BIT(1)
#define LM36274_MAX_REG 0x13
#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

5
include/linux/mfd/ti-lmu.h
View File

@ -26,7 +26,7 @@ enum ti_lmu_id {
LM3632,
LM3633,
LM3695,
LM3697,
LM36274,
LMU_MAX_ID,
};
@ -68,6 +68,9 @@ enum lm363x_regulator_id {
LM3632_BOOST, /* Boost output */
LM3632_LDO_POS, /* Positive display bias output */
LM3632_LDO_NEG, /* Negative display bias output */
LM36274_BOOST, /* Boost output */
LM36274_LDO_POS, /* Positive display bias output */
LM36274_LDO_NEG, /* Negative display bias output */
};
/**