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Subject: Re: [PATCH v2 2/2] leds: lp50xx: Add the LP50XX family of the RGB LED
 driver
To:     Dan Murphy <dmurphy@ti.com>, linux-leds@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org, pavel@ucw.cz,
        devicetree@vger.kernel.org, dachaac@gmail.com, robh+dt@kernel.org
References: <20190114211723.11186-1-dmurphy@ti.com>
 <20190114211723.11186-2-dmurphy@ti.com>
From:   Jacek Anaszewski <jacek.anaszewski@gmail.com>
Message-ID: <ce911fdf-c7c2-63e8-5c7a-b0be965ab69b@gmail.com>
Date:   Tue, 15 Jan 2019 22:47:49 +0100
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Hi Da,

Thank you for the v2.

I have some remarks below.

On 1/14/19 10:17 PM, Dan Murphy wrote:
> Introduce the LP5036/30/24/18 RGB LED driver.
> The difference in these parts are the number of
> LED outputs where the:
> 
> LP5036 can control 36 LEDs
> LP5030 can control 30 LEDs
> LP5024 can control 24 LEDs
> LP5018 can control 18 LEDs
> 
> The device has the ability to group LED output into control banks
> so that multiple LED banks can be controlled with the same mixing and
> brightness.  Inversely the LEDs can also be controlled independently.
> 
> Signed-off-by: Dan Murphy <dmurphy@ti.com>
> ---
> 
> v2 - Changed the mix and module files to a single "color" file, added the LP5030
> and LP5036 register mapping, added ABI documentation, updated the parsing of
> DT and led sources to match DT, renamed driver to leds-lp50xx.c - https://lore.kernel.org/patchwork/patch/1026515/
> 
>   Documentation/leds/leds-lp50xx.txt |  36 ++
>   drivers/leds/Kconfig               |   7 +
>   drivers/leds/Makefile              |   1 +
>   drivers/leds/leds-lp50xx.c         | 754 +++++++++++++++++++++++++++++
>   4 files changed, 798 insertions(+)
>   create mode 100644 Documentation/leds/leds-lp50xx.txt
>   create mode 100644 drivers/leds/leds-lp50xx.c
> 
> diff --git a/Documentation/leds/leds-lp50xx.txt b/Documentation/leds/leds-lp50xx.txt

Please move it to

Documentation/ABI/testing/sysfs-class-led-driver-lp50xx

and use standard ABI documentation format.


> new file mode 100644
> index 000000000000..8b1b01dfdd22
> --- /dev/null
> +++ b/Documentation/leds/leds-lp50xx.txt
> @@ -0,0 +1,36 @@
> +LP5018/LP5024/LP5030/LP5036 Common Driver
> +=================================================
> +
> +Authors: Dan Murphy <dmurphy@ti.com>
> +
> +Description
> +-----------
> +The LP50XX RGB LED drivers have the ability to group multiple RGB cluster
> +LEDs into a single group for simultaneous control or expose single RGB cluster
> +for control.  This device exposes different register interfaces to control
> +the cluster brightness as well as the individual RGB LEDs color intensity.
> +
> +RGB Cluster Color Control
> +-------------------------
> +The LP50xx driver will expose a file called "color" for each LED class instance
> +defined.  This file will accept a 24-bit RGB value in which the the color of the
> +RGB LEDs will be set.
> +
> +The 24-bit RGB value passed in follows the pattern 0xXXRRGGBB
> +XX - Do not care ignored by the driver
> +RR - is the 8 bit Red LED value
> +GG - is the 8 bit Green LED value
> +BB - is the 8 bit Blue LED value
> +
> +Example:
> +LED module output 4 of the LP5024 will be a yellow color:
> +echo 0xe6de00 > /sys/class/leds/lp5024\:led4_mod/color
> +
> +LED module output 4 of the LP5024 will be dimmed 50%:
> +echo 0x80 > /sys/class/leds/lp5024\:led4_mod/brightness
> +
> +LED banked RGBs of the LP5036 will be a white color:
> +echo 0xffffff > /sys/class/leds/lp5036\:led_banked/color

This part with example cans remain in Documentation/leds if you like.

> +
> +LED banked RGBs of the LP50364 will be dimmed 50%:
> +echo 0x80 > /sys/class/leds/lp5036\:led_banked/brightness
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index a72f97fca57b..5f413445a667 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -326,6 +326,13 @@ config LEDS_LP3952
>   	  To compile this driver as a module, choose M here: the
>   	  module will be called leds-lp3952.
>   
> +config LEDS_LP50XX
> +	tristate "LED Support for TI LP5036/30/24/18 LED driver chip"
> +	depends on LEDS_CLASS && REGMAP_I2C
> +	help
> +	  If you say yes here you get support for the Texas Instruments
> +	  LP5036, LP5030, LP5024 and LP5018 LED driver.
> +
>   config LEDS_LP55XX_COMMON
>   	tristate "Common Driver for TI/National LP5521/5523/55231/5562/8501"
>   	depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562 || LEDS_LP8501
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 4c1b0054f379..852eff0b773f 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -32,6 +32,7 @@ obj-$(CONFIG_LEDS_GPIO_REGISTER)	+= leds-gpio-register.o
>   obj-$(CONFIG_LEDS_GPIO)			+= leds-gpio.o
>   obj-$(CONFIG_LEDS_LP3944)		+= leds-lp3944.o
>   obj-$(CONFIG_LEDS_LP3952)		+= leds-lp3952.o
> +obj-$(CONFIG_LEDS_LP50XX)		+= leds-lp50xx.o
>   obj-$(CONFIG_LEDS_LP55XX_COMMON)	+= leds-lp55xx-common.o
>   obj-$(CONFIG_LEDS_LP5521)		+= leds-lp5521.o
>   obj-$(CONFIG_LEDS_LP5523)		+= leds-lp5523.o
> diff --git a/drivers/leds/leds-lp50xx.c b/drivers/leds/leds-lp50xx.c
> new file mode 100644
> index 000000000000..41bb2e0129c8
> --- /dev/null
> +++ b/drivers/leds/leds-lp50xx.c
> @@ -0,0 +1,754 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* TI LP50XX LED chip family driver
> + * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
> + */

Let's use uniform "//" comment style here.

> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/leds.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/slab.h>
> +#include <uapi/linux/uleds.h>
> +
> +#define LP50XX_DEV_CFG0		0x00
> +#define LP50XX_DEV_CFG1		0x01
> +#define LP50XX_LED_CFG0		0x02
> +
> +/* LP5018 and LP5024 registers */
> +#define LP5024_BNK_BRT		0x03
> +#define LP5024_BNKA_CLR		0x04
> +#define LP5024_BNKB_CLR		0x05
> +#define LP5024_BNKC_CLR		0x06
> +#define LP5024_LED0_BRT		0x07
> +#define LP5024_LED1_BRT		0x08
> +#define LP5024_LED2_BRT		0x09
> +#define LP5024_LED3_BRT		0x0a
> +#define LP5024_LED4_BRT		0x0b
> +#define LP5024_LED5_BRT		0x0c
> +#define LP5024_LED6_BRT		0x0d
> +#define LP5024_LED7_BRT		0x0e
> +
> +#define LP5024_OUT0_CLR		0x0f
> +#define LP5024_OUT1_CLR		0x10
> +#define LP5024_OUT2_CLR		0x11
> +#define LP5024_OUT3_CLR		0x12
> +#define LP5024_OUT4_CLR		0x13
> +#define LP5024_OUT5_CLR		0x14
> +#define LP5024_OUT6_CLR		0x15
> +#define LP5024_OUT7_CLR		0x16
> +#define LP5024_OUT8_CLR		0x17
> +#define LP5024_OUT9_CLR		0x18
> +#define LP5024_OUT10_CLR	0x19
> +#define LP5024_OUT11_CLR	0x1a
> +#define LP5024_OUT12_CLR	0x1b
> +#define LP5024_OUT13_CLR	0x1c
> +#define LP5024_OUT14_CLR	0x1d
> +#define LP5024_OUT15_CLR	0x1e
> +#define LP5024_OUT16_CLR	0x1f
> +#define LP5024_OUT17_CLR	0x20
> +#define LP5024_OUT18_CLR	0x21
> +#define LP5024_OUT19_CLR	0x22
> +#define LP5024_OUT20_CLR	0x23
> +#define LP5024_OUT21_CLR	0x24
> +#define LP5024_OUT22_CLR	0x25
> +#define LP5024_OUT23_CLR	0x26
> +#define LP5024_RESET		0x27
> +
> +/* LP5030 and LP5036 registers */
> +#define LP5036_LED_CFG1		0x03
> +#define LP5036_BNK_BRT		0x04
> +#define LP5036_BNKA_CLR		0x05
> +#define LP5036_BNKB_CLR		0x06
> +#define LP5036_BNKC_CLR		0x07
> +#define LP5036_LED0_BRT		0x08
> +#define LP5036_LED1_BRT		0x09
> +#define LP5036_LED2_BRT		0x0a
> +#define LP5036_LED3_BRT		0x0b
> +#define LP5036_LED4_BRT		0x0c
> +#define LP5036_LED5_BRT		0x0d
> +#define LP5036_LED6_BRT		0x0e
> +#define LP5036_LED7_BRT		0x0f
> +#define LP5036_LED8_BRT		0x10
> +#define LP5036_LED9_BRT		0x11
> +#define LP5036_LED10_BRT	0x12
> +#define LP5036_LED11_BRT	0x13
> +
> +#define LP5036_OUT0_CLR		0x14
> +#define LP5036_OUT1_CLR		0x15
> +#define LP5036_OUT2_CLR		0x16
> +#define LP5036_OUT3_CLR		0x17
> +#define LP5036_OUT4_CLR		0x18
> +#define LP5036_OUT5_CLR		0x19
> +#define LP5036_OUT6_CLR		0x1a
> +#define LP5036_OUT7_CLR		0x1b
> +#define LP5036_OUT8_CLR		0x1c
> +#define LP5036_OUT9_CLR		0x1d
> +#define LP5036_OUT10_CLR	0x1e
> +#define LP5036_OUT11_CLR	0x1f
> +#define LP5036_OUT12_CLR	0x20
> +#define LP5036_OUT13_CLR	0x21
> +#define LP5036_OUT14_CLR	0x22
> +#define LP5036_OUT15_CLR	0x23
> +#define LP5036_OUT16_CLR	0x24
> +#define LP5036_OUT17_CLR	0x25
> +#define LP5036_OUT18_CLR	0x26
> +#define LP5036_OUT19_CLR	0x27
> +#define LP5036_OUT20_CLR	0x28
> +#define LP5036_OUT21_CLR	0x29
> +#define LP5036_OUT22_CLR	0x2a
> +#define LP5036_OUT23_CLR	0x2b
> +#define LP5036_OUT24_CLR	0x2c
> +#define LP5036_OUT25_CLR	0x2d
> +#define LP5036_OUT26_CLR	0x2e
> +#define LP5036_OUT27_CLR	0x2f
> +#define LP5036_OUT28_CLR	0x30
> +#define LP5036_OUT29_CLR	0x31
> +#define LP5036_OUT30_CLR	0x32
> +#define LP5036_OUT31_CLR	0x33
> +#define LP5036_OUT32_CLR	0x34
> +#define LP5036_OUT33_CLR	0x35
> +#define LP5036_OUT34_CLR	0x36
> +#define LP5036_OUT35_CLR	0x37
> +#define LP5036_RESET		0x38
> +
> +#define LP50XX_SW_RESET		0xff
> +
> +#define LP50XX_CHIP_EN		BIT(6)
> +
> +#define LP5018_MAX_LED_STRINGS	6
> +#define LP5024_MAX_LED_STRINGS	8
> +#define LP5030_MAX_LED_STRINGS	10
> +#define LP5036_MAX_LED_STRINGS	12
> +
> +enum lp50xx_model {
> +	LP5018,
> +	LP5024,
> +	LP5030,
> +	LP5036,
> +};
> +
> +struct lp50xx_led {
> +	u32 led_strings[LP5036_MAX_LED_STRINGS];

It is possible to have only one bank, so this can be a property
of struct lp50xx. Moreover, it doesn't need to be an array,
but should be:

unsigned long bank_modules;

Then you will be able to use bitops on it, where bit position will
refer to the id of RGB LED module assigned to the bank.

> +	char label[LED_MAX_NAME_SIZE];
> +	struct led_classdev led_dev;
> +	struct lp50xx *priv;
> +	int led_number;
> +	u8 ctrl_bank_enabled;
> +};
> +
> +/**
> + * struct lp50xx -
> + * @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
> + * @model_id: ID of the device
> + * @leds: Array of LED strings

Please don't use capital letters for property description.
Still, some of the properties below remain undocumented.

> + */
> +struct lp50xx {
> +	struct gpio_desc *enable_gpio;
> +	struct regulator *regulator;
> +	struct i2c_client *client;
> +	struct regmap *regmap;
> +	struct device *dev;
> +	struct mutex lock;
> +	enum lp50xx_model model_id;
> +	int max_leds;
> +	int num_of_leds;
> +
> +	u8 led_brightness0_reg;
> +	u8 mix_out0_reg;
> +	u8 bank_brt_reg;
> +	u8 bank_mix_reg;
> +	u8 reset_reg;
> +
> +	/* This needs to be at the end of the struct */
> +	struct lp50xx_led leds[];
> +};
> +
> +static const struct reg_default lp5024_reg_defs[] = {
> +	{LP50XX_DEV_CFG0, 0x0},
> +	{LP50XX_DEV_CFG1, 0x3c},
> +	{LP50XX_LED_CFG0, 0x0},
> +	{LP5024_BNK_BRT, 0xff},
> +	{LP5024_BNKA_CLR, 0x0f},
> +	{LP5024_BNKB_CLR, 0x0f},
> +	{LP5024_BNKC_CLR, 0x0f},
> +	{LP5024_LED0_BRT, 0x0f},
> +	{LP5024_LED1_BRT, 0xff},
> +	{LP5024_LED2_BRT, 0xff},
> +	{LP5024_LED3_BRT, 0xff},
> +	{LP5024_LED4_BRT, 0xff},
> +	{LP5024_LED5_BRT, 0xff},
> +	{LP5024_LED6_BRT, 0xff},
> +	{LP5024_LED7_BRT, 0xff},
> +	{LP5024_OUT0_CLR, 0x0f},
> +	{LP5024_OUT1_CLR, 0x00},
> +	{LP5024_OUT2_CLR, 0x00},
> +	{LP5024_OUT3_CLR, 0x00},
> +	{LP5024_OUT4_CLR, 0x00},
> +	{LP5024_OUT5_CLR, 0x00},
> +	{LP5024_OUT6_CLR, 0x00},
> +	{LP5024_OUT7_CLR, 0x00},
> +	{LP5024_OUT8_CLR, 0x00},
> +	{LP5024_OUT9_CLR, 0x00},
> +	{LP5024_OUT10_CLR, 0x00},
> +	{LP5024_OUT11_CLR, 0x00},
> +	{LP5024_OUT12_CLR, 0x00},
> +	{LP5024_OUT13_CLR, 0x00},
> +	{LP5024_OUT14_CLR, 0x00},
> +	{LP5024_OUT15_CLR, 0x00},
> +	{LP5024_OUT16_CLR, 0x00},
> +	{LP5024_OUT17_CLR, 0x00},
> +	{LP5024_OUT18_CLR, 0x00},
> +	{LP5024_OUT19_CLR, 0x00},
> +	{LP5024_OUT20_CLR, 0x00},
> +	{LP5024_OUT21_CLR, 0x00},
> +	{LP5024_OUT22_CLR, 0x00},
> +	{LP5024_OUT23_CLR, 0x00},
> +	{LP5024_RESET, 0x00}
> +};
> +
> +static const struct reg_default lp5036_reg_defs[] = {
> +	{LP50XX_DEV_CFG0, 0x0},
> +	{LP50XX_DEV_CFG1, 0x3c},
> +	{LP50XX_LED_CFG0, 0x0},
> +	{LP5036_LED_CFG1, 0x0},
> +	{LP5036_BNK_BRT, 0xff},
> +	{LP5036_BNKA_CLR, 0x0f},
> +	{LP5036_BNKB_CLR, 0x0f},
> +	{LP5036_BNKC_CLR, 0x0f},
> +	{LP5036_LED0_BRT, 0x0f},
> +	{LP5036_LED1_BRT, 0xff},
> +	{LP5036_LED2_BRT, 0xff},
> +	{LP5036_LED3_BRT, 0xff},
> +	{LP5036_LED4_BRT, 0xff},
> +	{LP5036_LED5_BRT, 0xff},
> +	{LP5036_LED6_BRT, 0xff},
> +	{LP5036_LED7_BRT, 0xff},
> +	{LP5036_OUT0_CLR, 0x0f},
> +	{LP5036_OUT1_CLR, 0x00},
> +	{LP5036_OUT2_CLR, 0x00},
> +	{LP5036_OUT3_CLR, 0x00},
> +	{LP5036_OUT4_CLR, 0x00},
> +	{LP5036_OUT5_CLR, 0x00},
> +	{LP5036_OUT6_CLR, 0x00},
> +	{LP5036_OUT7_CLR, 0x00},
> +	{LP5036_OUT8_CLR, 0x00},
> +	{LP5036_OUT9_CLR, 0x00},
> +	{LP5036_OUT10_CLR, 0x00},
> +	{LP5036_OUT11_CLR, 0x00},
> +	{LP5036_OUT12_CLR, 0x00},
> +	{LP5036_OUT13_CLR, 0x00},
> +	{LP5036_OUT14_CLR, 0x00},
> +	{LP5036_OUT15_CLR, 0x00},
> +	{LP5036_OUT16_CLR, 0x00},
> +	{LP5036_OUT17_CLR, 0x00},
> +	{LP5036_OUT18_CLR, 0x00},
> +	{LP5036_OUT19_CLR, 0x00},
> +	{LP5036_OUT20_CLR, 0x00},
> +	{LP5036_OUT21_CLR, 0x00},
> +	{LP5036_OUT22_CLR, 0x00},
> +	{LP5036_OUT23_CLR, 0x00},
> +	{LP5036_OUT24_CLR, 0x00},
> +	{LP5036_OUT25_CLR, 0x00},
> +	{LP5036_OUT26_CLR, 0x00},
> +	{LP5036_OUT27_CLR, 0x00},
> +	{LP5036_OUT28_CLR, 0x00},
> +	{LP5036_OUT29_CLR, 0x00},
> +	{LP5036_OUT30_CLR, 0x00},
> +	{LP5036_OUT31_CLR, 0x00},
> +	{LP5036_OUT32_CLR, 0x00},
> +	{LP5036_OUT33_CLR, 0x00},
> +	{LP5036_OUT34_CLR, 0x00},
> +	{LP5036_OUT35_CLR, 0x00},
> +	{LP5036_RESET, 0x00}
> +};
> +
> +static const struct regmap_config lp5024_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +
> +	.max_register = LP5024_RESET,
> +	.reg_defaults = lp5024_reg_defs,
> +	.num_reg_defaults = ARRAY_SIZE(lp5024_reg_defs),
> +	.cache_type = REGCACHE_RBTREE,
> +};
> +
> +static const struct regmap_config lp5036_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +
> +	.max_register = LP5036_RESET,
> +	.reg_defaults = lp5036_reg_defs,
> +	.num_reg_defaults = ARRAY_SIZE(lp5036_reg_defs),
> +	.cache_type = REGCACHE_RBTREE,
> +};
> +
> +static ssize_t color_show(struct device *dev,
> +			struct device_attribute *attr,
> +			char *buf)
> +{
> +	struct led_classdev *led_cdev = dev_get_drvdata(dev);
> +	struct lp50xx_led *led = container_of(led_cdev, struct lp50xx_led,
> +					      led_dev);
> +	struct lp50xx *priv = led->priv;
> +	unsigned int red_val, green_val, blue_val;
> +	u8 red_reg, green_reg, blue_reg;
> +	u32 mix_value = 0;
> +	u8 led_offset;
> +	int ret;
> +
> +	if (led->ctrl_bank_enabled) {
> +		red_reg = priv->bank_mix_reg;
> +		green_reg = priv->bank_mix_reg + 1;
> +		blue_reg = priv->bank_mix_reg + 2;
> +	} else {
> +		led_offset = (led->led_number * 3);
> +		red_reg = priv->mix_out0_reg + led_offset;
> +		green_reg = priv->mix_out0_reg + led_offset + 1;
> +		blue_reg = priv->mix_out0_reg + led_offset + 2;
> +	}
> +
> +	ret = regmap_read(priv->regmap, red_reg, &red_val);
> +	if (ret) {
> +		dev_err(&priv->client->dev, "Cannot read LED value\n");
> +		goto out;
> +	}
> +
> +	ret = regmap_read(priv->regmap, green_reg, &green_val);
> +	if (ret) {
> +		dev_err(&priv->client->dev, "Cannot read LED value\n");
> +		goto out;
> +	}
> +
> +	ret = regmap_read(priv->regmap, blue_reg, &blue_val);
> +	if (ret) {
> +		dev_err(&priv->client->dev, "Cannot read LED value\n");
> +		goto out;
> +	}
> +
> +	mix_value = (red_val << 16 | green_val << 8 | blue_val);
> +
> +out:
> +	return scnprintf(buf, PAGE_SIZE, "0x%X\n", mix_value);
> +}
> +
> +static ssize_t color_store(struct device *dev,
> +				struct device_attribute *attr,
> +				const char *buf, size_t size)
> +{
> +	struct led_classdev *led_cdev = dev_get_drvdata(dev);
> +	struct lp50xx_led *led = container_of(led_cdev, struct lp50xx_led,
> +					      led_dev);
> +	struct lp50xx *priv = led->priv;
> +	u8 led_offset;
> +	unsigned long mix_value;
> +	u8 red_reg, green_reg, blue_reg;
> +	u8 red_val, green_val, blue_val;
> +	int ret;
> +
> +	ret = kstrtoul(buf, 0, &mix_value);
> +	if (ret)
> +		return ret;
> +
> +	if (led->ctrl_bank_enabled) {
> +		red_reg = priv->bank_mix_reg;
> +		green_reg = priv->bank_mix_reg + 1;
> +		blue_reg = priv->bank_mix_reg + 2;
> +	} else {
> +		led_offset = (led->led_number * 3);
> +		red_reg = priv->mix_out0_reg + led_offset;
> +		green_reg = priv->mix_out0_reg + led_offset + 1;
> +		blue_reg = priv->mix_out0_reg + led_offset + 2;
> +	}
> +
> +	red_val = (mix_value & 0xff0000) >> 16;
> +	green_val = (mix_value & 0xff00) >> 8;
> +	blue_val = (mix_value & 0xff);

I've been rather thinking about space separated list of decimal
"red green blue" values, but maybe this way it will be less
controversial. Let's if there will be other opinions.

> +
> +	ret = regmap_write(priv->regmap, red_reg, red_val);
> +	if (ret) {
> +		dev_err(&priv->client->dev, "Cannot write LED value\n");
> +		goto out;
> +	}
> +
> +	ret = regmap_write(priv->regmap, green_reg, green_val);
> +	if (ret) {
> +		dev_err(&priv->client->dev, "Cannot write LED value\n");
> +		goto out;
> +	}
> +
> +	ret = regmap_write(priv->regmap, blue_reg, blue_val);
> +	if (ret) {
> +		dev_err(&priv->client->dev, "Cannot write LED value\n");
> +		goto out;
> +	}
> +out:
> +	return size;
> +}
> +
> +static DEVICE_ATTR_RW(color);
> +
> +static struct attribute *lp50xx_led_color_attrs[] = {
> +	&dev_attr_color.attr,
> +	NULL
> +};
> +ATTRIBUTE_GROUPS(lp50xx_led_color);
> +
> +static int lp50xx_brightness_set(struct led_classdev *led_cdev,
> +				enum led_brightness brt_val)
> +{
> +	struct lp50xx_led *led = container_of(led_cdev, struct lp50xx_led,
> +					      led_dev);
> +	int ret = 0;
> +	u8 reg_val;
> +
> +	mutex_lock(&led->priv->lock);
> +
> +	if (led->ctrl_bank_enabled)
> +		reg_val = led->priv->bank_brt_reg;
> +	else
> +		reg_val = led->priv->led_brightness0_reg + led->led_number;
> +
> +	ret = regmap_write(led->priv->regmap, reg_val, brt_val);
> +
> +	mutex_unlock(&led->priv->lock);
> +
> +	return ret;
> +}
> +
> +static enum led_brightness lp50xx_brightness_get(struct led_classdev *led_cdev)
> +{
> +	struct lp50xx_led *led = container_of(led_cdev, struct lp50xx_led,
> +					      led_dev);
> +	unsigned int brt_val;
> +	u8 reg_val;
> +	int ret;
> +
> +	mutex_lock(&led->priv->lock);
> +
> +	if (led->ctrl_bank_enabled)
> +		reg_val = led->priv->bank_brt_reg;
> +	else
> +		reg_val = led->priv->led_brightness0_reg + led->led_number;
> +
> +	ret = regmap_read(led->priv->regmap, reg_val, &brt_val);
> +
> +	mutex_unlock(&led->priv->lock);
> +
> +	return brt_val;
> +}
> +
> +static void lp50xx_set_led_values(struct lp50xx *priv)
> +{
> +	if (priv->model_id == LP5018 || priv->model_id == LP5024) {
> +		priv->led_brightness0_reg = LP5024_LED0_BRT;
> +		priv->mix_out0_reg = LP5024_OUT0_CLR;
> +		priv->bank_brt_reg = LP5024_BNK_BRT;
> +		priv->bank_mix_reg = LP5024_BNKA_CLR;
> +		priv->reset_reg = LP5024_RESET;
> +	} else {
> +		priv->led_brightness0_reg = LP5036_LED0_BRT;
> +		priv->mix_out0_reg = LP5036_OUT0_CLR;
> +		priv->bank_brt_reg = LP5036_BNK_BRT;
> +		priv->bank_mix_reg = LP5036_BNKA_CLR;
> +		priv->reset_reg = LP5036_RESET;
> +	}
> +}
> +
> +static int lp50xx_set_banks(struct lp50xx *priv)
> +{
> +	struct lp50xx_led *led;
> +	u8 led_ctrl_enable = 0;
> +	u8 led1_ctrl_enable = 0;
> +	u8 ctrl_ext = 0;
> +	int i, j;
> +	int ret;
> +
> +	for (i = 0; i <= priv->num_of_leds; i++) {
> +		led = &priv->leds[i];
> +		if (!led->ctrl_bank_enabled)
> +			continue;
> +
> +		for (j = 0; j <= priv->max_leds - 1; j++) {
> +			if (led->led_strings[j]	> (LP5024_MAX_LED_STRINGS - 1)) {
> +				ctrl_ext = led->led_strings[j] - LP5024_MAX_LED_STRINGS;
> +				led1_ctrl_enable |= (1 << ctrl_ext);
> +			} else {
> +				led_ctrl_enable |= (1 << led->led_strings[j]);
> +			}
> +		}
> +	}

With centralized bank_modules flags it should look simpler.

> +
> +	ret = regmap_write(priv->regmap, LP50XX_LED_CFG0, led_ctrl_enable);
> +
> +	if (led1_ctrl_enable)
> +		ret = regmap_write(priv->regmap, LP5036_LED_CFG1,
> +				   led1_ctrl_enable);
> +
> +	return ret;
> +}
> +
> +static int lp50xx_init(struct lp50xx *priv)
> +{
> +	int ret;
> +
> +	lp50xx_set_led_values(priv);
> +
> +	if (priv->enable_gpio) {
> +		gpiod_direction_output(priv->enable_gpio, 1);
> +	} else {
> +		ret = regmap_write(priv->regmap, priv->reset_reg,
> +				   LP50XX_SW_RESET);
> +		if (ret) {
> +			dev_err(&priv->client->dev,
> +				"Cannot reset the device\n");
> +			goto out;
> +		}
> +	}
> +
> +	ret = lp50xx_set_banks(priv);
> +	if (ret) {
> +		dev_err(&priv->client->dev, "Cannot set the banks\n");
> +		goto out;
> +	}
> +
> +	ret = regmap_write(priv->regmap, LP50XX_DEV_CFG0, LP50XX_CHIP_EN);
> +	if (ret)
> +		dev_err(&priv->client->dev, "Cannot write ctrl enable\n");
> +
> +out:
> +	return ret;
> +}
> +
> +static int lp50xx_probe_dt(struct lp50xx *priv)
> +{
> +	struct fwnode_handle *child = NULL;
> +	struct lp50xx_led *led;
> +	int control_bank_defined = 0;
> +	const char *name;
> +	int led_number;
> +	size_t i = 0;
> +	int ret;
> +
> +	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;
> +
> +	if (priv->model_id == LP5018)
> +		priv->max_leds = LP5018_MAX_LED_STRINGS;
> +	else if (priv->model_id == LP5024)
> +		priv->max_leds = LP5024_MAX_LED_STRINGS;
> +	else if (priv->model_id == LP5030)
> +		priv->max_leds = LP5030_MAX_LED_STRINGS;
> +	else
> +		priv->max_leds = LP5036_MAX_LED_STRINGS;

Let's change STRINGS to MODULEs.

> +
> +	device_for_each_child_node(&priv->client->dev, child) {
> +		led = &priv->leds[i];
> +
> +		if (fwnode_property_present(child, "ti,led-bank")) {
> +			led->ctrl_bank_enabled = 1;
> +			if (!control_bank_defined)
> +				control_bank_defined = 1;
> +			else {
> +				dev_err(&priv->client->dev,
> +					"ti,led-bank defined twice\n");
> +				fwnode_handle_put(child);
> +				goto child_out;
> +			}
> +		} else {
> +			led->ctrl_bank_enabled = 0;
> +		}

Any bit set in bank_modules will signify that bank is defined
and enabled.

> +		if (led->ctrl_bank_enabled) {
> +			ret = fwnode_property_read_u32_array(child,
> +							     "ti,led-bank",
> +							     NULL, 0);
> +			ret = fwnode_property_read_u32_array(child,
> +							     "ti,led-bank",
> +							     led->led_strings,
> +							     ret);
> +
> +			led->led_number = led->led_strings[0];
> +
> +		} else {
> +			ret = fwnode_property_read_u32(child, "ti,led-module",
> +					       &led_number);
> +
> +			led->led_number = led_number;
> +		}
> +		if (ret) {
> +			dev_err(&priv->client->dev,
> +				"led sourcing property missing\n");
> +			fwnode_handle_put(child);
> +			goto child_out;
> +		}
> +
> +		if (led_number > priv->max_leds) {
> +			dev_err(&priv->client->dev,
> +				"led-sources property is invalid\n");
> +			ret = -EINVAL;
> +			fwnode_handle_put(child);
> +			goto child_out;
> +		}
> +
> +		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);
> +
> +		fwnode_property_read_string(child, "linux,default-trigger",
> +				    &led->led_dev.default_trigger);
> +
> +		led->priv = priv;
> +		led->led_dev.name = led->label;
> +		led->led_dev.brightness_set_blocking = lp50xx_brightness_set;
> +		led->led_dev.brightness_get = lp50xx_brightness_get;
> +		led->led_dev.groups = lp50xx_led_color_groups;
> +
> +		ret = devm_led_classdev_register(&priv->client->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++;
> +	}
> +	priv->num_of_leds = i;
> +
> +child_out:
> +	return ret;
> +}
> +
> +static int lp50xx_probe(struct i2c_client *client,
> +			const struct i2c_device_id *id)
> +{
> +	struct lp50xx *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);
> +	led->client = client;
> +	led->dev = &client->dev;
> +	led->model_id = id->driver_data;
> +	i2c_set_clientdata(client, led);
> +
> +	if (led->model_id == LP5018 || led->model_id == LP5024)
> +		led->regmap = devm_regmap_init_i2c(client,
> +						   &lp5024_regmap_config);
> +	else
> +		led->regmap = devm_regmap_init_i2c(client,
> +						   &lp5036_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 = lp50xx_probe_dt(led);
> +	if (ret)
> +		return ret;
> +
> +	ret = lp50xx_init(led);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int lp50xx_remove(struct i2c_client *client)
> +{
> +	struct lp50xx *led = i2c_get_clientdata(client);
> +	int ret;
> +
> +	ret = regmap_update_bits(led->regmap, LP50XX_DEV_CFG0,
> +				 LP50XX_CHIP_EN, 0);
> +	if (ret) {
> +		dev_err(&led->client->dev, "Failed to disable regulator\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 lp50xx_id[] = {
> +	{ "lp5018", LP5018 },
> +	{ "lp5024", LP5024 },
> +	{ "lp5030", LP5030 },
> +	{ "lp5036", LP5036 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, lp50xx_id);
> +
> +static const struct of_device_id of_lp50xx_leds_match[] = {
> +	{ .compatible = "ti,lp5018", },
> +	{ .compatible = "ti,lp5024", },
> +	{ .compatible = "ti,lp5030", },
> +	{ .compatible = "ti,lp5036", },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, of_lp50xx_leds_match);
> +
> +static struct i2c_driver lp50xx_driver = {
> +	.driver = {
> +		.name	= "lp50xx",
> +		.of_match_table = of_lp50xx_leds_match,
> +	},
> +	.probe		= lp50xx_probe,
> +	.remove		= lp50xx_remove,
> +	.id_table	= lp50xx_id,
> +};
> +module_i2c_driver(lp50xx_driver);
> +
> +MODULE_DESCRIPTION("Texas Instruments LP5024 LED driver");
> +MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
> +MODULE_LICENSE("GPL v2");
> 

-- 
Best regards,
Jacek Anaszewski