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Merge tag 'ti-lmu-led-drivers' into for-next

Telusuri Sumber 
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
orang tua 09bfa5f683 11e1bbc116
melakukan 25529edef5
15 mengubah file dengan 1132 tambahan dan 82 penghapusan
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25
drivers/leds/Kconfig
Melihat 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
Melihat 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
Melihat File

@@ -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
Melihat File

@@ -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
Melihat 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");