[PATCH v4 0/2] Add RT5033 Flash LED driver

[PATCH v4 0/2] Add RT5033 Flash LED driver

[Ingi Kim]

This patch supports flash led of RT5033 PMIC.

Changes since v4:
 - Use of_node_put() when DT parse miss
 - Move struct(rt5033_led) from include/linux/mfd/rt5033.h
   to local driver/leds/leds-rt5033.c
 - Remove MODULE_DEVICE_TABLE
 - Add interface to handle two LEDs.

Changes since v3:
 - Use mutex and work queue
 - Split brightness set func (sync / async)
 - Add flash API (flash_brightness_set)
 - Move struct(rt5033_led_config_data) to local area
 - Code clean

Changes since v2:
 - Split MFC code from rt5033 flash led patch
 - Fix typo error
 - Change naming of mfd register back again
 - Fix compile error

Ingi Kim (2):
  leds: rt5033: Add DT binding for RT5033
  leds: rt5033: Add RT5033 Flash led device driver

 .../devicetree/bindings/leds/leds-rt5033.txt       |  46 ++
 drivers/leds/Kconfig                               |   8 +
 drivers/leds/Makefile                              |   1 +
 drivers/leds/leds-rt5033.c                         | 502 +++++++++++++++++++++
 include/linux/mfd/rt5033-private.h                 |  51 +++
 5 files changed, 608 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-rt5033.txt
 create mode 100644 drivers/leds/leds-rt5033.c

-- 
2.0.5

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[PATCH v4 0/2] Add RT5033 Flash LED driver

[Ingi Kim]

This patch supports flash led of RT5033 PMIC.

Changes since v4:
 - Use of_node_put() when DT parse miss
 - Move struct(rt5033_led) from include/linux/mfd/rt5033.h
   to local driver/leds/leds-rt5033.c
 - Remove MODULE_DEVICE_TABLE
 - Add interface to handle two LEDs.

Changes since v3:
 - Use mutex and work queue
 - Split brightness set func (sync / async)
 - Add flash API (flash_brightness_set)
 - Move struct(rt5033_led_config_data) to local area
 - Code clean

Changes since v2:
 - Split MFC code from rt5033 flash led patch
 - Fix typo error
 - Change naming of mfd register back again
 - Fix compile error

Ingi Kim (2):
  leds: rt5033: Add DT binding for RT5033
  leds: rt5033: Add RT5033 Flash led device driver

 .../devicetree/bindings/leds/leds-rt5033.txt       |  46 ++
 drivers/leds/Kconfig                               |   8 +
 drivers/leds/Makefile                              |   1 +
 drivers/leds/leds-rt5033.c                         | 502 +++++++++++++++++++++
 include/linux/mfd/rt5033-private.h                 |  51 +++
 5 files changed, 608 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-rt5033.txt
 create mode 100644 drivers/leds/leds-rt5033.c

-- 
2.0.5

[PATCH v4 1/2] leds: rt5033: Add DT binding for RT5033

[Ingi Kim]

This patch adds the device tree bindings for RT5033 flash LEDs.

Signed-off-by: Ingi Kim <ingi2.kim@samsung.com>
Acked-by: Rob Herring <robh@kernel.org>
---
 .../devicetree/bindings/leds/leds-rt5033.txt       | 46 ++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-rt5033.txt

diff --git a/Documentation/devicetree/bindings/leds/leds-rt5033.txt b/Documentation/devicetree/bindings/leds/leds-rt5033.txt
new file mode 100644
index 0000000..17159d4
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-rt5033.txt
@@ -0,0 +1,46 @@
+* Richtek Technology Corporation - RT5033 Flash LED Driver
+
+The RT5033 Flash LED Circuit is designed for one or two LEDs driving
+for torch and strobe applications, it provides an I2C software command
+to trigger the torch and strobe operation.
+
+There are two LED outputs available - FLED1 and FLED2. Each of them can
+control a separate LED or they can be connected together to double
+the maximum current for a single connected LED. One LED is represented
+by one child node.
+
+Required properties:
+- compatible : Must be "richtek,rt5033-led".
+
+A discrete LED element connected to the device must be represented by a child
+node - see Documentation/devicetree/bindings/leds/common.txt.
+
+Required properties for the LED child node:
+  See Documentation/devicetree/bindings/leds/common.txt
+- led-sources : device current output identifiers:  0 - FLED1, 1 - FLED2
+- led-max-microamp : 12.5mA to 200mA, step by 12.5mA.
+- flash-max-microamp :
+	Turn on one LED channel : 50mA to 800mA, step by 25mA.
+	Turn on two LED channels : 50mA to 600mA, step by 25mA.
+- flash-max-timeout-us : 64ms to 1216ms, step by 32ms.
+
+Optional properties for the LED child node:
+- label : see Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+
+rt5033 {
+	compatible = "richtek,rt5033";
+
+	led {
+		compatible = "richtek,rt5033-led";
+
+		flash-led {
+			label = "rt5033-flash";
+			led-sources = <0>, <1>;
+			led-max-microamp = <200000>;
+			flash-max-microamp = <800000>;
+			flash-max-timeout-us = <1216000>;
+		};
+	};
+}
-- 
2.0.5

[PATCH v4 2/2] leds: rt5033: Add RT5033 Flash led device driver

[Ingi Kim]

This patch adds device driver of Richtek RT5033 PMIC.
The driver supports a current regulated output to drive white LEDs.

Signed-off-by: Ingi Kim <ingi2.kim@samsung.com>
---
 drivers/leds/Kconfig               |   8 +
 drivers/leds/Makefile              |   1 +
 drivers/leds/leds-rt5033.c         | 502 +++++++++++++++++++++++++++++++++++++
 include/linux/mfd/rt5033-private.h |  51 ++++
 4 files changed, 562 insertions(+)
 create mode 100644 drivers/leds/leds-rt5033.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 42990f2..29613e3 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -345,6 +345,14 @@ config LEDS_PCA963X
 	  LED driver chip accessed via the I2C bus. Supported
 	  devices include PCA9633 and PCA9634
 
+config LEDS_RT5033
+	tristate "LED support for RT5033 PMIC"
+	depends on LEDS_CLASS_FLASH && OF
+	depends on MFD_RT5033
+	help
+	  This option enables support for on-chip LED driver on
+	  RT5033 PMIC.
+
 config LEDS_WM831X_STATUS
 	tristate "LED support for status LEDs on WM831x PMICs"
 	depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index b503f92..bcc4d93 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_LEDS_COBALT_QUBE)		+= leds-cobalt-qube.o
 obj-$(CONFIG_LEDS_COBALT_RAQ)		+= leds-cobalt-raq.o
 obj-$(CONFIG_LEDS_SUNFIRE)		+= leds-sunfire.o
 obj-$(CONFIG_LEDS_PCA9532)		+= leds-pca9532.o
+obj-$(CONFIG_LEDS_RT5033)		+= leds-rt5033.o
 obj-$(CONFIG_LEDS_GPIO_REGISTER)	+= leds-gpio-register.o
 obj-$(CONFIG_LEDS_GPIO)			+= leds-gpio.o
 obj-$(CONFIG_LEDS_LP3944)		+= leds-lp3944.o
diff --git a/drivers/leds/leds-rt5033.c b/drivers/leds/leds-rt5033.c
new file mode 100644
index 0000000..eb89731
--- /dev/null
+++ b/drivers/leds/leds-rt5033.c
@@ -0,0 +1,502 @@
+/*
+ * led driver for RT5033
+ *
+ * Copyright (C) 2015 Samsung Electronics, Co., Ltd.
+ * Ingi Kim <ingi2.kim@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/led-class-flash.h>
+#include <linux/mfd/rt5033.h>
+#include <linux/mfd/rt5033-private.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+
+#define RT5033_LED_FLASH_TIMEOUT_MIN		64000
+#define RT5033_LED_FLASH_TIMEOUT_STEP		32000
+#define RT5033_LED_FLASH_BRIGHTNESS_MIN		50000
+#define RT5033_LED_FLASH_BRIGHTNESS_MAX_1CH	600000
+#define RT5033_LED_FLASH_BRIGHTNESS_MAX_2CH	800000
+#define RT5033_LED_FLASH_BRIGHTNESS_STEP	25000
+#define RT5033_LED_TORCH_BRIGHTNESS_MIN		12500
+#define RT5033_LED_TORCH_BRIGHTNESS_STEP	12500
+
+/* Macro to get offset of rt5033_led_config_data */
+#define RT5033_LED_CONFIG_DATA_OFFSET(val, step, min)	(((val) - (min)) \
+							/ (step))
+#define MIN(a, b)		((a) > (b) ? (b) : (a))
+#define FLED1_IOUT		(BIT(0))
+#define FLED2_IOUT		(BIT(1))
+
+enum rt5033_fled {
+	FLED1,
+	FLED2,
+};
+
+struct rt5033_sub_led {
+	enum rt5033_fled fled_id;
+	struct led_classdev_flash fled_cdev;
+	struct work_struct work_brightness_set;
+
+	u32 torch_brightness;
+	u32 flash_brightness;
+	u32 flash_timeout;
+};
+
+/* RT5033 Flash led platform data */
+struct rt5033_led {
+	struct device *dev;
+	struct mutex lock;
+	struct regmap *regmap;
+	struct rt5033_sub_led sub_leds[2];
+
+	u32 iout_torch_max[2];
+	u32 iout_flash_max[2];
+	u8 fled_mask;
+
+	/* arrangement of current outputs */
+	bool iout_joint;
+};
+
+struct rt5033_led_config_data {
+	const char *label[2];
+	u32 flash_max_microamp[2];
+	u32 flash_max_timeout[2];
+	u32 torch_max_microamp[2];
+	u32 num_leds;
+};
+
+static struct rt5033_sub_led *flcdev_to_sub_led(
+					struct led_classdev_flash *fled_cdev)
+{
+	return container_of(fled_cdev, struct rt5033_sub_led, fled_cdev);
+}
+
+static struct rt5033_led *sub_led_to_led(struct rt5033_sub_led *sub_led)
+{
+	return container_of(sub_led, struct rt5033_led,
+			    sub_leds[sub_led->fled_id]);
+}
+
+static int rt5033_fled_used(struct rt5033_led *led, enum rt5033_fled fled_id)
+{
+	u8 fled_bit = (fled_id == FLED1) ? FLED1_IOUT : FLED2_IOUT;
+
+	return led->fled_mask & fled_bit;
+}
+
+static void __rt5033_led_brightness_set(struct rt5033_led *led,
+					enum rt5033_fled fled_id,
+					enum led_brightness brightness)
+{
+	unsigned int val;
+
+	mutex_lock(&led->lock);
+
+	if (!brightness) {
+		regmap_read(led->regmap, RT5033_REG_FLED_FUNCTION1, &val);
+		val &= ~(rt5033_fled_used(led, fled_id));
+		regmap_write(led->regmap, RT5033_REG_FLED_FUNCTION1, val);
+	} else {
+		regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1,
+				   RT5033_FLED_FUNC1_MASK, RT5033_FLED_PINCTRL |
+				   rt5033_fled_used(led, fled_id));
+		regmap_update_bits(led->regmap,	RT5033_REG_FLED_CTRL1,
+				   RT5033_FLED_CTRL1_MASK,
+				   (brightness - 1) << 4);
+		regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION2,
+				   RT5033_FLED_FUNC2_MASK, RT5033_FLED_ENFLED);
+	}
+
+	mutex_unlock(&led->lock);
+}
+
+static void rt5033_led_brightness_set_work(struct work_struct *work)
+{
+	struct rt5033_sub_led *sub_led =
+		container_of(work, struct rt5033_sub_led, work_brightness_set);
+	struct rt5033_led *led = sub_led_to_led(sub_led);
+
+	__rt5033_led_brightness_set(led, sub_led->fled_id,
+				    sub_led->torch_brightness);
+}
+
+static void rt5033_led_brightness_set(struct led_classdev *led_cdev,
+				      enum led_brightness brightness)
+{
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
+
+	sub_led->torch_brightness = brightness;
+	schedule_work(&sub_led->work_brightness_set);
+}
+
+static int rt5033_led_brightness_set_sync(struct led_classdev *led_cdev,
+					  enum led_brightness brightness)
+{
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
+	struct rt5033_led *led = sub_led_to_led(sub_led);
+
+	__rt5033_led_brightness_set(led, sub_led->fled_id, brightness);
+
+	return 0;
+}
+
+static int rt5033_led_flash_brightness_set(struct led_classdev_flash *fled_cdev,
+					   u32 brightness)
+{
+	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
+	struct rt5033_led *led = sub_led_to_led(sub_led);
+	u32 flash_brightness_offset;
+
+	mutex_lock(&led->lock);
+
+	flash_brightness_offset =
+		RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->brightness.val,
+					      fled_cdev->brightness.step,
+					      fled_cdev->brightness.min);
+	sub_led->flash_brightness = flash_brightness_offset;
+
+	mutex_unlock(&led->lock);
+
+	return 0;
+}
+
+static int rt5033_led_flash_timeout_set(struct led_classdev_flash *fled_cdev,
+					u32 timeout)
+{
+	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
+	struct rt5033_led *led = sub_led_to_led(sub_led);
+	u32 flash_tm_offset;
+
+	mutex_lock(&led->lock);
+
+	flash_tm_offset =
+		RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->timeout.val,
+					      fled_cdev->timeout.step,
+					      fled_cdev->timeout.min);
+	sub_led->flash_timeout = flash_tm_offset;
+
+	mutex_unlock(&led->lock);
+
+	return 0;
+}
+
+static int rt5033_led_flash_strobe_set(struct led_classdev_flash *fled_cdev,
+				       bool state)
+{
+	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
+	struct rt5033_led *led = sub_led_to_led(sub_led);
+	enum rt5033_fled fled_id = sub_led->fled_id;
+	unsigned int val;
+
+	regmap_update_bits(led->regmap,	RT5033_REG_FLED_FUNCTION2,
+			   RT5033_FLED_FUNC2_MASK, 0x0);
+	if (state) {
+		regmap_update_bits(led->regmap,	RT5033_REG_FLED_STROBE_CTRL2,
+				   RT5033_FLED_STRBCTRL2_MASK,
+				   sub_led->flash_timeout);
+		regmap_update_bits(led->regmap, RT5033_REG_FLED_STROBE_CTRL1,
+				   RT5033_FLED_STRBCTRL1_MASK,
+				   sub_led->flash_brightness);
+		regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1,
+				   RT5033_FLED_FUNC1_MASK,
+				   RT5033_FLED_PINCTRL | RT5033_FLED_STRB_SEL |
+				   rt5033_fled_used(led, fled_id));
+		regmap_update_bits(led->regmap,	RT5033_REG_FLED_FUNCTION2,
+				   RT5033_FLED_FUNC2_MASK, RT5033_FLED_ENFLED
+				   | RT5033_FLED_SREG_STRB);
+
+		regmap_read(led->regmap, RT5033_REG_FLED_FUNCTION1, &val);
+	}
+
+	fled_cdev->led_cdev.brightness = LED_OFF;
+
+	mutex_unlock(&led->lock);
+
+	return 0;
+}
+
+static const struct led_flash_ops flash_ops = {
+	.flash_brightness_set = rt5033_led_flash_brightness_set,
+	.strobe_set = rt5033_led_flash_strobe_set,
+	.timeout_set = rt5033_led_flash_timeout_set,
+};
+
+static void rt5033_init_flash_properties(struct rt5033_sub_led *sub_led,
+					 struct rt5033_led_config_data *led_cfg)
+{
+	struct led_classdev_flash *fled_cdev = &sub_led->fled_cdev;
+	struct rt5033_led *led = sub_led_to_led(sub_led);
+	struct led_flash_setting *tm_set, *fl_set;
+	enum rt5033_fled fled_id = sub_led->fled_id;
+
+	tm_set = &fled_cdev->timeout;
+	tm_set->min = RT5033_LED_FLASH_TIMEOUT_MIN;
+	tm_set->max = led_cfg->flash_max_timeout[fled_id];
+	tm_set->step = RT5033_LED_FLASH_TIMEOUT_STEP;
+	tm_set->val = tm_set->max;
+
+	fl_set = &fled_cdev->brightness;
+	fl_set->min = RT5033_LED_FLASH_BRIGHTNESS_MIN;
+	if (led->iout_joint)
+		fl_set->max = MIN(led_cfg->flash_max_microamp[FLED1] +
+				  led_cfg->flash_max_microamp[FLED2],
+				  RT5033_LED_FLASH_BRIGHTNESS_MAX_2CH);
+	else
+		fl_set->max = MIN(led_cfg->flash_max_microamp[fled_id],
+				  RT5033_LED_FLASH_BRIGHTNESS_MAX_1CH);
+	fl_set->step = RT5033_LED_FLASH_BRIGHTNESS_STEP;
+	fl_set->val = fl_set->max;
+}
+
+static void rt5033_led_init_fled_cdev(struct rt5033_sub_led *sub_led,
+				      struct rt5033_led_config_data *led_cfg)
+{
+	struct led_classdev_flash *fled_cdev;
+	struct led_classdev *led_cdev;
+	enum rt5033_fled fled_id = sub_led->fled_id;
+	u32 flash_tm_offset, flash_brightness_offset;
+
+	/* Initialize LED Flash class device */
+	fled_cdev = &sub_led->fled_cdev;
+	fled_cdev->ops = &flash_ops;
+	led_cdev = &fled_cdev->led_cdev;
+
+	led_cdev->name = led_cfg->label[fled_id];
+
+	led_cdev->brightness_set = rt5033_led_brightness_set;
+	led_cdev->brightness_set_sync = rt5033_led_brightness_set_sync;
+	led_cdev->max_brightness = RT5033_LED_CONFIG_DATA_OFFSET(
+				   led_cfg->torch_max_microamp[fled_id],
+				   RT5033_LED_TORCH_BRIGHTNESS_STEP,
+				   RT5033_LED_TORCH_BRIGHTNESS_MIN);
+
+	led_cdev->flags |= LED_DEV_CAP_FLASH;
+	INIT_WORK(&sub_led->work_brightness_set,
+		  rt5033_led_brightness_set_work);
+
+	rt5033_init_flash_properties(sub_led, led_cfg);
+
+	flash_tm_offset = RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->timeout.val,
+							fled_cdev->timeout.step,
+							fled_cdev->timeout.min);
+	flash_brightness_offset =
+		RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->brightness.val,
+					      fled_cdev->brightness.step,
+					      fled_cdev->brightness.min);
+
+	sub_led->flash_timeout = flash_tm_offset;
+	sub_led->flash_brightness = flash_brightness_offset;
+}
+
+static int rt5033_led_parse_dt(struct rt5033_led *led, struct device *dev,
+			       struct rt5033_led_config_data *cfg,
+			       struct device_node **sub_nodes)
+{
+	struct device_node *np = dev->of_node;
+	struct device_node *child_node;
+	struct rt5033_sub_led *sub_leds = led->sub_leds;
+	struct property *prop;
+	u32 led_sources[2];
+	enum rt5033_fled fled_id;
+	int i, ret;
+
+	if (!np)
+		return -ENXIO;
+
+	for_each_available_child_of_node(np, child_node) {
+		prop = of_find_property(child_node, "led-sources", NULL);
+		if (prop) {
+			const u32 *srcs = NULL;
+
+			for (i = 0; i < ARRAY_SIZE(led_sources); ++i) {
+				srcs = of_prop_next_u32(prop, srcs,
+							&led_sources[i]);
+				if (!srcs)
+					break;
+			}
+		} else {
+			dev_err(dev, "led-sources DT property missing\n");
+			ret = -EINVAL;
+			goto err_parse_dt;
+		}
+
+		if (i == 2) {
+			fled_id = FLED1;
+			led->fled_mask = FLED1_IOUT | FLED2_IOUT;
+		} else if (led_sources[0] == FLED1) {
+			fled_id = FLED1;
+			led->fled_mask |= FLED1_IOUT;
+		} else if (led_sources[0] == FLED2) {
+			fled_id = FLED2;
+			led->fled_mask |= FLED2_IOUT;
+		} else {
+			dev_err(dev, "Wrong led-sources DT property value.\n");
+			ret = -EINVAL;
+			goto err_parse_dt;
+		}
+
+		if (sub_nodes[fled_id]) {
+			dev_err(dev,
+				"Conflicting \"led-sources\" DT properties\n");
+			ret = -EINVAL;
+			goto err_parse_dt;
+		}
+
+		sub_nodes[fled_id] = child_node;
+		sub_leds[fled_id].fled_id = fled_id;
+
+		cfg->label[fled_id] =
+			of_get_property(child_node, "label", NULL) ? :
+					child_node->name;
+
+		ret = of_property_read_u32(child_node, "led-max-microamp",
+					   &cfg->torch_max_microamp[fled_id]);
+		if (ret) {
+			dev_err(dev, "failed to parse led-max-microamp\n");
+			goto err_parse_dt;
+		}
+
+		ret = of_property_read_u32(child_node, "flash-max-microamp",
+					   &cfg->flash_max_microamp[fled_id]);
+		if (ret) {
+			dev_err(dev, "failed to parse flash-max-microamp\n");
+			goto err_parse_dt;
+		}
+
+		ret = of_property_read_u32(child_node, "flash-max-timeout-us",
+					   &cfg->flash_max_timeout[fled_id]);
+		if (ret) {
+			dev_err(dev, "failed to parse flash-max-timeout-us\n");
+			goto err_parse_dt;
+		}
+
+		if (++cfg->num_leds == 2 ||
+		    (rt5033_fled_used(led, FLED1) &&
+		     rt5033_fled_used(led, FLED2))) {
+			of_node_put(child_node);
+			break;
+		}
+	}
+
+	if (cfg->num_leds == 0) {
+		dev_err(dev, "No DT child node found for connected LED(s).\n");
+		return -EINVAL;
+	}
+
+	return 0;
+
+err_parse_dt:
+	of_node_put(child_node);
+	return ret;
+}
+
+static int rt5033_led_probe(struct platform_device *pdev)
+{
+	struct rt5033_dev *rt5033 = dev_get_drvdata(pdev->dev.parent);
+	struct rt5033_led *led;
+	struct rt5033_sub_led *sub_leds;
+	struct device_node *sub_nodes[2] = {};
+	struct rt5033_led_config_data led_cfg = {};
+	int init_fled_cdev[2], i, ret;
+
+	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, led);
+	led->dev = &pdev->dev;
+	led->regmap = rt5033->regmap;
+	sub_leds = led->sub_leds;
+
+	ret = rt5033_led_parse_dt(led, &pdev->dev, &led_cfg, sub_nodes);
+	if (ret)
+		return ret;
+
+	if (led_cfg.num_leds == 1 && rt5033_fled_used(led, FLED1) &&
+	    rt5033_fled_used(led, FLED2))
+		led->iout_joint = true;
+
+	mutex_init(&led->lock);
+
+	init_fled_cdev[FLED1] =
+			led->iout_joint || rt5033_fled_used(led, FLED1);
+	init_fled_cdev[FLED2] =
+			!led->iout_joint && rt5033_fled_used(led, FLED2);
+
+	for (i = FLED1; i <= FLED2; ++i) {
+		if (!init_fled_cdev[i])
+			continue;
+
+		rt5033_led_init_fled_cdev(&sub_leds[i], &led_cfg);
+		ret = led_classdev_flash_register(led->dev,
+						  &sub_leds[i].fled_cdev);
+		if (ret < 0) {
+			if (i == FLED2)
+				goto err_register_led2;
+			else
+				goto err_register_led1;
+		}
+	}
+
+	regmap_update_bits(led->regmap,	RT5033_REG_FLED_FUNCTION1,
+			   RT5033_FLED_FUNC1_MASK, RT5033_FLED_RESET);
+
+	return 0;
+
+err_register_led2:
+	led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev);
+err_register_led1:
+	mutex_destroy(&led->lock);
+
+	return ret;
+}
+
+static int rt5033_led_remove(struct platform_device *pdev)
+{
+	struct rt5033_led *led = platform_get_drvdata(pdev);
+	struct rt5033_sub_led *sub_leds = led->sub_leds;
+
+	if (led->iout_joint || rt5033_fled_used(led, FLED1)) {
+		led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev);
+		cancel_work_sync(&sub_leds[FLED1].work_brightness_set);
+	}
+
+	if (!led->iout_joint && rt5033_fled_used(led, FLED2)) {
+		led_classdev_flash_unregister(&sub_leds[FLED2].fled_cdev);
+		cancel_work_sync(&sub_leds[FLED2].work_brightness_set);
+	}
+
+	mutex_destroy(&led->lock);
+
+	return 0;
+}
+
+static const struct of_device_id rt5033_led_match[] = {
+	{ .compatible = "richtek,rt5033-led", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, rt5033_led_match);
+
+static struct platform_driver rt5033_led_driver = {
+	.driver = {
+		.name = "rt5033-led",
+		.of_match_table = rt5033_led_match,
+	},
+	.probe		= rt5033_led_probe,
+	.remove		= rt5033_led_remove,
+};
+module_platform_driver(rt5033_led_driver);
+
+MODULE_AUTHOR("Ingi Kim <ingi2.kim@samsung.com>");
+MODULE_DESCRIPTION("Richtek RT5033 LED driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:rt5033-led");
diff --git a/include/linux/mfd/rt5033-private.h b/include/linux/mfd/rt5033-private.h
index 1b63fc2..b20c7e4 100644
--- a/include/linux/mfd/rt5033-private.h
+++ b/include/linux/mfd/rt5033-private.h
@@ -93,6 +93,57 @@ enum rt5033_reg {
 #define RT5033_RT_CTRL1_UUG_MASK	0x02
 #define RT5033_RT_HZ_MASK		0x01
 
+/* RT5033 FLED Function1 register */
+#define RT5033_FLED_FUNC1_MASK		0x97
+#define RT5033_FLED_EN_LEDCS1		0x01
+#define RT5033_FLED_EN_LEDCS2		0x02
+#define RT5033_FLED_STRB_SEL		0x04
+#define RT5033_FLED_PINCTRL		0x10
+#define RT5033_FLED_RESET		0x80
+
+/* RT5033 FLED Function2 register */
+#define RT5033_FLED_FUNC2_MASK		0x81
+#define RT5033_FLED_ENFLED		0x01
+#define RT5033_FLED_SREG_STRB		0x80
+
+/* RT5033 FLED Strobe Control1 */
+#define RT5033_FLED_STRBCTRL1_MASK		0xFF
+#define RT5033_FLED_STRBCTRL1_TM_CUR_MAX	0xE0
+#define RT5033_FLED_STRBCTRL1_FL_CUR_DEF	0x0D
+#define RT5033_FLED_STRBCTRL1_FL_CUR_MAX	0x1F
+
+/* RT5033 FLED Strobe Control2 */
+#define RT5033_FLED_STRBCTRL2_MASK	0x3F
+#define RT5033_FLED_STRBCTRL2_TM_DEF	0x0F
+#define RT5033_FLED_STRBCTRL2_TM_MAX	0x3F
+
+/* RT5033 FLED Control1 */
+#define RT5033_FLED_CTRL1_MASK		0xF7
+#define RT5033_FLED_CTRL1_TORCH_CUR_DEF	0x20
+#define RT5033_FLED_CTRL1_TORCH_CUR_MAX	0xF0
+#define RT5033_FLED_CTRL1_LBP_DEF	0x02
+#define RT5033_FLED_CTRL1_LBP_MAX	0x07
+
+/* RT5033 FLED Control2 */
+#define RT5033_FLED_CTRL2_MASK		0xFF
+#define RT5033_FLED_CTRL2_VMID_DEF	0x37
+#define RT5033_FLED_CTRL2_VMID_MAX	0x3F
+#define RT5033_FLED_CTRL2_TRACK_ALIVE	0x40
+#define RT5033_FLED_CTRL2_MID_TRACK	0x80
+
+/* RT5033 FLED Control4 */
+#define RT5033_FLED_CTRL4_MASK		0xE0
+#define RT5033_FLED_CTRL4_RESV		0x14
+#define RT5033_FLED_CTRL4_VTRREG_DEF	0x40
+#define RT5033_FLED_CTRL4_VTRREG_MAX	0x60
+#define RT5033_FLED_CTRL4_TRACK_CLK	0x80
+
+/* RT5033 FLED Control5 */
+#define RT5033_FLED_CTRL5_MASK		0xC0
+#define RT5033_FLED_CTRL5_RESV		0x10
+#define RT5033_FLED_CTRL5_TA_GOOD	0x40
+#define RT5033_FLED_CTRL5_TA_EXIST	0x80
+
 /* RT5033 control register */
 #define RT5033_CTRL_FCCM_BUCK_MASK		0x00
 #define RT5033_CTRL_BUCKOMS_MASK		0x01
-- 
2.0.5

Re: [PATCH v4 2/2] leds: rt5033: Add RT5033 Flash led device driver

[Jacek Anaszewski]

Hi Ingi,

Thanks for the update. Please find my comments below.

On 11/10/2015 03:17 AM, Ingi Kim wrote:
> This patch adds device driver of Richtek RT5033 PMIC.
> The driver supports a current regulated output to drive white LEDs.

I would add here also the part from leds-rt5033.txt header.

>
> Signed-off-by: Ingi Kim <ingi2.kim-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
> ---
>   drivers/leds/Kconfig               |   8 +
>   drivers/leds/Makefile              |   1 +
>   drivers/leds/leds-rt5033.c         | 502 +++++++++++++++++++++++++++++++++++++
>   include/linux/mfd/rt5033-private.h |  51 ++++
>   4 files changed, 562 insertions(+)
>   create mode 100644 drivers/leds/leds-rt5033.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 42990f2..29613e3 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -345,6 +345,14 @@ config LEDS_PCA963X
>   	  LED driver chip accessed via the I2C bus. Supported
>   	  devices include PCA9633 and PCA9634
>
> +config LEDS_RT5033
> +	tristate "LED support for RT5033 PMIC"
> +	depends on LEDS_CLASS_FLASH && OF
> +	depends on MFD_RT5033
> +	help
> +	  This option enables support for on-chip LED driver on
> +	  RT5033 PMIC.
> +
>   config LEDS_WM831X_STATUS
>   	tristate "LED support for status LEDs on WM831x PMICs"
>   	depends on LEDS_CLASS
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index b503f92..bcc4d93 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -23,6 +23,7 @@ obj-$(CONFIG_LEDS_COBALT_QUBE)		+= leds-cobalt-qube.o
>   obj-$(CONFIG_LEDS_COBALT_RAQ)		+= leds-cobalt-raq.o
>   obj-$(CONFIG_LEDS_SUNFIRE)		+= leds-sunfire.o
>   obj-$(CONFIG_LEDS_PCA9532)		+= leds-pca9532.o
> +obj-$(CONFIG_LEDS_RT5033)		+= leds-rt5033.o
>   obj-$(CONFIG_LEDS_GPIO_REGISTER)	+= leds-gpio-register.o
>   obj-$(CONFIG_LEDS_GPIO)			+= leds-gpio.o
>   obj-$(CONFIG_LEDS_LP3944)		+= leds-lp3944.o
> diff --git a/drivers/leds/leds-rt5033.c b/drivers/leds/leds-rt5033.c
> new file mode 100644
> index 0000000..eb89731
> --- /dev/null
> +++ b/drivers/leds/leds-rt5033.c
> @@ -0,0 +1,502 @@
> +/*
> + * led driver for RT5033
> + *
> + * Copyright (C) 2015 Samsung Electronics, Co., Ltd.
> + * Ingi Kim <ingi2.kim-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#include <linux/led-class-flash.h>
> +#include <linux/mfd/rt5033.h>
> +#include <linux/mfd/rt5033-private.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/platform_device.h>
> +#include <linux/workqueue.h>
> +
> +#define RT5033_LED_FLASH_TIMEOUT_MIN		64000
> +#define RT5033_LED_FLASH_TIMEOUT_STEP		32000
> +#define RT5033_LED_FLASH_BRIGHTNESS_MIN		50000
> +#define RT5033_LED_FLASH_BRIGHTNESS_MAX_1CH	600000
> +#define RT5033_LED_FLASH_BRIGHTNESS_MAX_2CH	800000
> +#define RT5033_LED_FLASH_BRIGHTNESS_STEP	25000
> +#define RT5033_LED_TORCH_BRIGHTNESS_MIN		12500
> +#define RT5033_LED_TORCH_BRIGHTNESS_STEP	12500
> +
> +/* Macro to get offset of rt5033_led_config_data */
> +#define RT5033_LED_CONFIG_DATA_OFFSET(val, step, min)	(((val) - (min)) \
> +							/ (step))
> +#define MIN(a, b)		((a) > (b) ? (b) : (a))

Please use min() macro from include/linux/kernel.h

> +#define FLED1_IOUT		(BIT(0))
> +#define FLED2_IOUT		(BIT(1))
> +
> +enum rt5033_fled {
> +	FLED1,
> +	FLED2,
> +};
> +
> +struct rt5033_sub_led {
> +	enum rt5033_fled fled_id;
> +	struct led_classdev_flash fled_cdev;
> +	struct work_struct work_brightness_set;
> +
> +	u32 torch_brightness;
> +	u32 flash_brightness;
> +	u32 flash_timeout;
> +};
> +
> +/* RT5033 Flash led platform data */
> +struct rt5033_led {
> +	struct device *dev;
> +	struct mutex lock;
> +	struct regmap *regmap;
> +	struct rt5033_sub_led sub_leds[2];
> +
> +	u32 iout_torch_max[2];
> +	u32 iout_flash_max[2];

You're not using above two properties anywhere in the driver.

> +	u8 fled_mask;
> +
> +	/* arrangement of current outputs */
> +	bool iout_joint;
> +};
> +
> +struct rt5033_led_config_data {
> +	const char *label[2];
> +	u32 flash_max_microamp[2];
> +	u32 flash_max_timeout[2];
> +	u32 torch_max_microamp[2];
> +	u32 num_leds;
> +};
> +
> +static struct rt5033_sub_led *flcdev_to_sub_led(
> +					struct led_classdev_flash *fled_cdev)
> +{
> +	return container_of(fled_cdev, struct rt5033_sub_led, fled_cdev);
> +}
> +
> +static struct rt5033_led *sub_led_to_led(struct rt5033_sub_led *sub_led)
> +{
> +	return container_of(sub_led, struct rt5033_led,
> +			    sub_leds[sub_led->fled_id]);
> +}
> +
> +static int rt5033_fled_used(struct rt5033_led *led, enum rt5033_fled fled_id)
> +{
> +	u8 fled_bit = (fled_id == FLED1) ? FLED1_IOUT : FLED2_IOUT;
> +
> +	return led->fled_mask & fled_bit;
> +}
> +
> +static void __rt5033_led_brightness_set(struct rt5033_led *led,
> +					enum rt5033_fled fled_id,
> +					enum led_brightness brightness)
> +{
> +	unsigned int val;
> +
> +	mutex_lock(&led->lock);
> +
> +	if (!brightness) {
> +		regmap_read(led->regmap, RT5033_REG_FLED_FUNCTION1, &val);
> +		val &= ~(rt5033_fled_used(led, fled_id));

Please change val type to the one corresponding with the device register
width, i.e. if the register is 8-bit wide, then val should be u8.
Please also calculate the value to write directly here, and not with use
of ~rt5033_fled_used, which returns int and is designed for different
purposes.

> +		regmap_write(led->regmap, RT5033_REG_FLED_FUNCTION1, val);
> +	} else {
> +		regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1,
> +				   RT5033_FLED_FUNC1_MASK, RT5033_FLED_PINCTRL |
> +				   rt5033_fled_used(led, fled_id));
> +		regmap_update_bits(led->regmap,	RT5033_REG_FLED_CTRL1,
> +				   RT5033_FLED_CTRL1_MASK,
> +				   (brightness - 1) << 4);
> +		regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION2,
> +				   RT5033_FLED_FUNC2_MASK, RT5033_FLED_ENFLED);
> +	}

How are you distinguishing between setting brightness for iout_joint
case and for individual LEDs? Have you tested this use case?
Even if you don't have a board with two separate LEDs,
you should be able to test two LED class devices with a single
connected LED.

> +	mutex_unlock(&led->lock);
> +}
> +
> +static void rt5033_led_brightness_set_work(struct work_struct *work)
> +{
> +	struct rt5033_sub_led *sub_led =
> +		container_of(work, struct rt5033_sub_led, work_brightness_set);
> +	struct rt5033_led *led = sub_led_to_led(sub_led);
> +
> +	__rt5033_led_brightness_set(led, sub_led->fled_id,
> +				    sub_led->torch_brightness);
> +}
> +
> +static void rt5033_led_brightness_set(struct led_classdev *led_cdev,
> +				      enum led_brightness brightness)
> +{
> +	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
> +	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
> +
> +	sub_led->torch_brightness = brightness;
> +	schedule_work(&sub_led->work_brightness_set);
> +}
> +
> +static int rt5033_led_brightness_set_sync(struct led_classdev *led_cdev,
> +					  enum led_brightness brightness)
> +{
> +	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
> +	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
> +	struct rt5033_led *led = sub_led_to_led(sub_led);
> +
> +	__rt5033_led_brightness_set(led, sub_led->fled_id, brightness);
> +
> +	return 0;
> +}
> +
> +static int rt5033_led_flash_brightness_set(struct led_classdev_flash *fled_cdev,
> +					   u32 brightness)
> +{
> +	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
> +	struct rt5033_led *led = sub_led_to_led(sub_led);
> +	u32 flash_brightness_offset;
> +
> +	mutex_lock(&led->lock);
> +
> +	flash_brightness_offset =
> +		RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->brightness.val,
> +					      fled_cdev->brightness.step,
> +					      fled_cdev->brightness.min);

Please assign directly to sub_led->flash_brightness.

> +	sub_led->flash_brightness = flash_brightness_offset;
> +
> +	mutex_unlock(&led->lock);
> +
> +	return 0;
> +}
> +
> +static int rt5033_led_flash_timeout_set(struct led_classdev_flash *fled_cdev,
> +					u32 timeout)
> +{
> +	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
> +	struct rt5033_led *led = sub_led_to_led(sub_led);
> +	u32 flash_tm_offset;
> +
> +	mutex_lock(&led->lock);
> +
> +	flash_tm_offset =
> +		RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->timeout.val,
> +					      fled_cdev->timeout.step,
> +					      fled_cdev->timeout.min);

Please assign directly to sub_led->flash_tm_offset.

> +	sub_led->flash_timeout = flash_tm_offset;
> +
> +	mutex_unlock(&led->lock);
> +
> +	return 0;
> +}
> +
> +static int rt5033_led_flash_strobe_set(struct led_classdev_flash *fled_cdev,
> +				       bool state)
> +{
> +	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
> +	struct rt5033_led *led = sub_led_to_led(sub_led);
> +	enum rt5033_fled fled_id = sub_led->fled_id;
> +	unsigned int val;

mutex_lock is missing here.

> +
> +	regmap_update_bits(led->regmap,	RT5033_REG_FLED_FUNCTION2,
> +			   RT5033_FLED_FUNC2_MASK, 0x0);
> +	if (state) {
> +		regmap_update_bits(led->regmap,	RT5033_REG_FLED_STROBE_CTRL2,
> +				   RT5033_FLED_STRBCTRL2_MASK,
> +				   sub_led->flash_timeout);
> +		regmap_update_bits(led->regmap, RT5033_REG_FLED_STROBE_CTRL1,
> +				   RT5033_FLED_STRBCTRL1_MASK,
> +				   sub_led->flash_brightness);
> +		regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1,
> +				   RT5033_FLED_FUNC1_MASK,
> +				   RT5033_FLED_PINCTRL | RT5033_FLED_STRB_SEL |
> +				   rt5033_fled_used(led, fled_id));
> +		regmap_update_bits(led->regmap,	RT5033_REG_FLED_FUNCTION2,
> +				   RT5033_FLED_FUNC2_MASK, RT5033_FLED_ENFLED
> +				   | RT5033_FLED_SREG_STRB);
> +
> +		regmap_read(led->regmap, RT5033_REG_FLED_FUNCTION1, &val);
> +	}
> +
> +	fled_cdev->led_cdev.brightness = LED_OFF;
> +
> +	mutex_unlock(&led->lock);
> +
> +	return 0;
> +}
> +
> +static const struct led_flash_ops flash_ops = {
> +	.flash_brightness_set = rt5033_led_flash_brightness_set,
> +	.strobe_set = rt5033_led_flash_strobe_set,
> +	.timeout_set = rt5033_led_flash_timeout_set,
> +};
> +
> +static void rt5033_init_flash_properties(struct rt5033_sub_led *sub_led,
> +					 struct rt5033_led_config_data *led_cfg)
> +{
> +	struct led_classdev_flash *fled_cdev = &sub_led->fled_cdev;
> +	struct rt5033_led *led = sub_led_to_led(sub_led);
> +	struct led_flash_setting *tm_set, *fl_set;
> +	enum rt5033_fled fled_id = sub_led->fled_id;
> +
> +	tm_set = &fled_cdev->timeout;
> +	tm_set->min = RT5033_LED_FLASH_TIMEOUT_MIN;
> +	tm_set->max = led_cfg->flash_max_timeout[fled_id];
> +	tm_set->step = RT5033_LED_FLASH_TIMEOUT_STEP;
> +	tm_set->val = tm_set->max;
> +
> +	fl_set = &fled_cdev->brightness;
> +	fl_set->min = RT5033_LED_FLASH_BRIGHTNESS_MIN;
> +	if (led->iout_joint)
> +		fl_set->max = MIN(led_cfg->flash_max_microamp[FLED1] +
> +				  led_cfg->flash_max_microamp[FLED2],
> +				  RT5033_LED_FLASH_BRIGHTNESS_MAX_2CH);
> +	else
> +		fl_set->max = MIN(led_cfg->flash_max_microamp[fled_id],
> +				  RT5033_LED_FLASH_BRIGHTNESS_MAX_1CH);
> +	fl_set->step = RT5033_LED_FLASH_BRIGHTNESS_STEP;
> +	fl_set->val = fl_set->max;
> +}
> +
> +static void rt5033_led_init_fled_cdev(struct rt5033_sub_led *sub_led,
> +				      struct rt5033_led_config_data *led_cfg)
> +{
> +	struct led_classdev_flash *fled_cdev;
> +	struct led_classdev *led_cdev;
> +	enum rt5033_fled fled_id = sub_led->fled_id;
> +	u32 flash_tm_offset, flash_brightness_offset;
> +
> +	/* Initialize LED Flash class device */
> +	fled_cdev = &sub_led->fled_cdev;
> +	fled_cdev->ops = &flash_ops;
> +	led_cdev = &fled_cdev->led_cdev;
> +
> +	led_cdev->name = led_cfg->label[fled_id];
> +
> +	led_cdev->brightness_set = rt5033_led_brightness_set;
> +	led_cdev->brightness_set_sync = rt5033_led_brightness_set_sync;
> +	led_cdev->max_brightness = RT5033_LED_CONFIG_DATA_OFFSET(
> +				   led_cfg->torch_max_microamp[fled_id],
> +				   RT5033_LED_TORCH_BRIGHTNESS_STEP,
> +				   RT5033_LED_TORCH_BRIGHTNESS_MIN);
> +
> +	led_cdev->flags |= LED_DEV_CAP_FLASH;
> +	INIT_WORK(&sub_led->work_brightness_set,
> +		  rt5033_led_brightness_set_work);

Please rebase your code on top of LED tree devel branch:

git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds.git

Those LED core changes will be applied to the for-next branch
in the beginning of the next week, and they'll allow to get rid of
work queues and brightness_set_sync ops from drivers. Please refer
to the patches that remove related code from leds-max77693.c to
find out how to adapt your driver to benefit from LED core
optimizations.


> +	rt5033_init_flash_properties(sub_led, led_cfg);
> +
> +	flash_tm_offset = RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->timeout.val,
> +							fled_cdev->timeout.step,
> +							fled_cdev->timeout.min);
> +	flash_brightness_offset =
> +		RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->brightness.val,
> +					      fled_cdev->brightness.step,
> +					      fled_cdev->brightness.min);
> +
> +	sub_led->flash_timeout = flash_tm_offset;
> +	sub_led->flash_brightness = flash_brightness_offset;
> +}
> +
> +static int rt5033_led_parse_dt(struct rt5033_led *led, struct device *dev,
> +			       struct rt5033_led_config_data *cfg,
> +			       struct device_node **sub_nodes)
> +{
> +	struct device_node *np = dev->of_node;
> +	struct device_node *child_node;
> +	struct rt5033_sub_led *sub_leds = led->sub_leds;
> +	struct property *prop;
> +	u32 led_sources[2];
> +	enum rt5033_fled fled_id;
> +	int i, ret;
> +
> +	if (!np)
> +		return -ENXIO;

Probe has been called, so dev->of_node must have been present.
Please remove above guard.

> +	for_each_available_child_of_node(np, child_node) {
> +		prop = of_find_property(child_node, "led-sources", NULL);
> +		if (prop) {
> +			const u32 *srcs = NULL;

This should be:

const __be32 *srcs = NULL;

sparse tool detects this type of problems [1].

> +
> +			for (i = 0; i < ARRAY_SIZE(led_sources); ++i) {
> +				srcs = of_prop_next_u32(prop, srcs,
> +							&led_sources[i]);
> +				if (!srcs)
> +					break;
> +			}
> +		} else {
> +			dev_err(dev, "led-sources DT property missing\n");
> +			ret = -EINVAL;
> +			goto err_parse_dt;
> +		}
> +
> +		if (i == 2) {
> +			fled_id = FLED1;
> +			led->fled_mask = FLED1_IOUT | FLED2_IOUT;
> +		} else if (led_sources[0] == FLED1) {
> +			fled_id = FLED1;
> +			led->fled_mask |= FLED1_IOUT;
> +		} else if (led_sources[0] == FLED2) {
> +			fled_id = FLED2;
> +			led->fled_mask |= FLED2_IOUT;
> +		} else {
> +			dev_err(dev, "Wrong led-sources DT property value.\n");
> +			ret = -EINVAL;
> +			goto err_parse_dt;
> +		}
> +
> +		if (sub_nodes[fled_id]) {
> +			dev_err(dev,
> +				"Conflicting \"led-sources\" DT properties\n");
> +			ret = -EINVAL;
> +			goto err_parse_dt;
> +		}
> +
> +		sub_nodes[fled_id] = child_node;
> +		sub_leds[fled_id].fled_id = fled_id;
> +
> +		cfg->label[fled_id] =
> +			of_get_property(child_node, "label", NULL) ? :
> +					child_node->name;
> +
> +		ret = of_property_read_u32(child_node, "led-max-microamp",
> +					   &cfg->torch_max_microamp[fled_id]);
> +		if (ret) {
> +			dev_err(dev, "failed to parse led-max-microamp\n");
> +			goto err_parse_dt;
> +		}
> +
> +		ret = of_property_read_u32(child_node, "flash-max-microamp",
> +					   &cfg->flash_max_microamp[fled_id]);
> +		if (ret) {
> +			dev_err(dev, "failed to parse flash-max-microamp\n");
> +			goto err_parse_dt;
> +		}
> +
> +		ret = of_property_read_u32(child_node, "flash-max-timeout-us",
> +					   &cfg->flash_max_timeout[fled_id]);
> +		if (ret) {
> +			dev_err(dev, "failed to parse flash-max-timeout-us\n");
> +			goto err_parse_dt;
> +		}
> +
> +		if (++cfg->num_leds == 2 ||
> +		    (rt5033_fled_used(led, FLED1) &&
> +		     rt5033_fled_used(led, FLED2))) {
> +			of_node_put(child_node);
> +			break;
> +		}
> +	}
> +
> +	if (cfg->num_leds == 0) {
> +		dev_err(dev, "No DT child node found for connected LED(s).\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +
> +err_parse_dt:
> +	of_node_put(child_node);
> +	return ret;
> +}
> +
> +static int rt5033_led_probe(struct platform_device *pdev)
> +{
> +	struct rt5033_dev *rt5033 = dev_get_drvdata(pdev->dev.parent);
> +	struct rt5033_led *led;
> +	struct rt5033_sub_led *sub_leds;
> +	struct device_node *sub_nodes[2] = {};
> +	struct rt5033_led_config_data led_cfg = {};
> +	int init_fled_cdev[2], i, ret;
> +
> +	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
> +	if (!led)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, led);
> +	led->dev = &pdev->dev;
> +	led->regmap = rt5033->regmap;
> +	sub_leds = led->sub_leds;
> +
> +	ret = rt5033_led_parse_dt(led, &pdev->dev, &led_cfg, sub_nodes);
> +	if (ret)
> +		return ret;
> +
> +	if (led_cfg.num_leds == 1 && rt5033_fled_used(led, FLED1) &&
> +	    rt5033_fled_used(led, FLED2))
> +		led->iout_joint = true;
> +
> +	mutex_init(&led->lock);
> +
> +	init_fled_cdev[FLED1] =
> +			led->iout_joint || rt5033_fled_used(led, FLED1);
> +	init_fled_cdev[FLED2] =
> +			!led->iout_joint && rt5033_fled_used(led, FLED2);
> +
> +	for (i = FLED1; i <= FLED2; ++i) {
> +		if (!init_fled_cdev[i])
> +			continue;
> +
> +		rt5033_led_init_fled_cdev(&sub_leds[i], &led_cfg);
> +		ret = led_classdev_flash_register(led->dev,
> +						  &sub_leds[i].fled_cdev);
> +		if (ret < 0) {
> +			if (i == FLED2)
> +				goto err_register_led2;
> +			else
> +				goto err_register_led1;
> +		}
> +	}
> +
> +	regmap_update_bits(led->regmap,	RT5033_REG_FLED_FUNCTION1,
> +			   RT5033_FLED_FUNC1_MASK, RT5033_FLED_RESET);
> +
> +	return 0;
> +
> +err_register_led2:
> +	led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev);
> +err_register_led1:
> +	mutex_destroy(&led->lock);
> +
> +	return ret;
> +}
> +
> +static int rt5033_led_remove(struct platform_device *pdev)
> +{
> +	struct rt5033_led *led = platform_get_drvdata(pdev);
> +	struct rt5033_sub_led *sub_leds = led->sub_leds;
> +
> +	if (led->iout_joint || rt5033_fled_used(led, FLED1)) {
> +		led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev);
> +		cancel_work_sync(&sub_leds[FLED1].work_brightness_set);
> +	}
> +
> +	if (!led->iout_joint && rt5033_fled_used(led, FLED2)) {
> +		led_classdev_flash_unregister(&sub_leds[FLED2].fled_cdev);
> +		cancel_work_sync(&sub_leds[FLED2].work_brightness_set);
> +	}
> +
> +	mutex_destroy(&led->lock);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id rt5033_led_match[] = {
> +	{ .compatible = "richtek,rt5033-led", },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, rt5033_led_match);
> +
> +static struct platform_driver rt5033_led_driver = {
> +	.driver = {
> +		.name = "rt5033-led",
> +		.of_match_table = rt5033_led_match,
> +	},
> +	.probe		= rt5033_led_probe,
> +	.remove		= rt5033_led_remove,
> +};
> +module_platform_driver(rt5033_led_driver);
> +
> +MODULE_AUTHOR("Ingi Kim <ingi2.kim-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>");
> +MODULE_DESCRIPTION("Richtek RT5033 LED driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:rt5033-led");
> diff --git a/include/linux/mfd/rt5033-private.h b/include/linux/mfd/rt5033-private.h
> index 1b63fc2..b20c7e4 100644
> --- a/include/linux/mfd/rt5033-private.h
> +++ b/include/linux/mfd/rt5033-private.h
> @@ -93,6 +93,57 @@ enum rt5033_reg {
>   #define RT5033_RT_CTRL1_UUG_MASK	0x02
>   #define RT5033_RT_HZ_MASK		0x01
>
> +/* RT5033 FLED Function1 register */
> +#define RT5033_FLED_FUNC1_MASK		0x97
> +#define RT5033_FLED_EN_LEDCS1		0x01
> +#define RT5033_FLED_EN_LEDCS2		0x02
> +#define RT5033_FLED_STRB_SEL		0x04
> +#define RT5033_FLED_PINCTRL		0x10
> +#define RT5033_FLED_RESET		0x80
> +
> +/* RT5033 FLED Function2 register */
> +#define RT5033_FLED_FUNC2_MASK		0x81
> +#define RT5033_FLED_ENFLED		0x01
> +#define RT5033_FLED_SREG_STRB		0x80
> +
> +/* RT5033 FLED Strobe Control1 */
> +#define RT5033_FLED_STRBCTRL1_MASK		0xFF
> +#define RT5033_FLED_STRBCTRL1_TM_CUR_MAX	0xE0
> +#define RT5033_FLED_STRBCTRL1_FL_CUR_DEF	0x0D
> +#define RT5033_FLED_STRBCTRL1_FL_CUR_MAX	0x1F
> +
> +/* RT5033 FLED Strobe Control2 */
> +#define RT5033_FLED_STRBCTRL2_MASK	0x3F
> +#define RT5033_FLED_STRBCTRL2_TM_DEF	0x0F
> +#define RT5033_FLED_STRBCTRL2_TM_MAX	0x3F
> +
> +/* RT5033 FLED Control1 */
> +#define RT5033_FLED_CTRL1_MASK		0xF7
> +#define RT5033_FLED_CTRL1_TORCH_CUR_DEF	0x20
> +#define RT5033_FLED_CTRL1_TORCH_CUR_MAX	0xF0
> +#define RT5033_FLED_CTRL1_LBP_DEF	0x02
> +#define RT5033_FLED_CTRL1_LBP_MAX	0x07
> +
> +/* RT5033 FLED Control2 */
> +#define RT5033_FLED_CTRL2_MASK		0xFF
> +#define RT5033_FLED_CTRL2_VMID_DEF	0x37
> +#define RT5033_FLED_CTRL2_VMID_MAX	0x3F
> +#define RT5033_FLED_CTRL2_TRACK_ALIVE	0x40
> +#define RT5033_FLED_CTRL2_MID_TRACK	0x80
> +
> +/* RT5033 FLED Control4 */
> +#define RT5033_FLED_CTRL4_MASK		0xE0
> +#define RT5033_FLED_CTRL4_RESV		0x14
> +#define RT5033_FLED_CTRL4_VTRREG_DEF	0x40
> +#define RT5033_FLED_CTRL4_VTRREG_MAX	0x60
> +#define RT5033_FLED_CTRL4_TRACK_CLK	0x80
> +
> +/* RT5033 FLED Control5 */
> +#define RT5033_FLED_CTRL5_MASK		0xC0
> +#define RT5033_FLED_CTRL5_RESV		0x10
> +#define RT5033_FLED_CTRL5_TA_GOOD	0x40
> +#define RT5033_FLED_CTRL5_TA_EXIST	0x80
> +
>   /* RT5033 control register */
>   #define RT5033_CTRL_FCCM_BUCK_MASK		0x00
>   #define RT5033_CTRL_BUCKOMS_MASK		0x01
>

[1] Documentation/sparse.txt

-- 
Best Regards,
Jacek Anaszewski
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Re: [PATCH v4 2/2] leds: rt5033: Add RT5033 Flash led device driver

[Jacek Anaszewski]

Hi Ingi,

Thanks for the update. Please find my comments below.

On 11/10/2015 03:17 AM, Ingi Kim wrote:
> This patch adds device driver of Richtek RT5033 PMIC.
> The driver supports a current regulated output to drive white LEDs.

I would add here also the part from leds-rt5033.txt header.

>
> Signed-off-by: Ingi Kim <ingi2.kim@samsung.com>
> ---
>   drivers/leds/Kconfig               |   8 +
>   drivers/leds/Makefile              |   1 +
>   drivers/leds/leds-rt5033.c         | 502 +++++++++++++++++++++++++++++++++++++
>   include/linux/mfd/rt5033-private.h |  51 ++++
>   4 files changed, 562 insertions(+)
>   create mode 100644 drivers/leds/leds-rt5033.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 42990f2..29613e3 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -345,6 +345,14 @@ config LEDS_PCA963X
>   	  LED driver chip accessed via the I2C bus. Supported
>   	  devices include PCA9633 and PCA9634
>
> +config LEDS_RT5033
> +	tristate "LED support for RT5033 PMIC"
> +	depends on LEDS_CLASS_FLASH && OF
> +	depends on MFD_RT5033
> +	help
> +	  This option enables support for on-chip LED driver on
> +	  RT5033 PMIC.
> +
>   config LEDS_WM831X_STATUS
>   	tristate "LED support for status LEDs on WM831x PMICs"
>   	depends on LEDS_CLASS
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index b503f92..bcc4d93 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -23,6 +23,7 @@ obj-$(CONFIG_LEDS_COBALT_QUBE)		+= leds-cobalt-qube.o
>   obj-$(CONFIG_LEDS_COBALT_RAQ)		+= leds-cobalt-raq.o
>   obj-$(CONFIG_LEDS_SUNFIRE)		+= leds-sunfire.o
>   obj-$(CONFIG_LEDS_PCA9532)		+= leds-pca9532.o
> +obj-$(CONFIG_LEDS_RT5033)		+= leds-rt5033.o
>   obj-$(CONFIG_LEDS_GPIO_REGISTER)	+= leds-gpio-register.o
>   obj-$(CONFIG_LEDS_GPIO)			+= leds-gpio.o
>   obj-$(CONFIG_LEDS_LP3944)		+= leds-lp3944.o
> diff --git a/drivers/leds/leds-rt5033.c b/drivers/leds/leds-rt5033.c
> new file mode 100644
> index 0000000..eb89731
> --- /dev/null
> +++ b/drivers/leds/leds-rt5033.c
> @@ -0,0 +1,502 @@
> +/*
> + * led driver for RT5033
> + *
> + * Copyright (C) 2015 Samsung Electronics, Co., Ltd.
> + * Ingi Kim <ingi2.kim@samsung.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#include <linux/led-class-flash.h>
> +#include <linux/mfd/rt5033.h>
> +#include <linux/mfd/rt5033-private.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/platform_device.h>
> +#include <linux/workqueue.h>
> +
> +#define RT5033_LED_FLASH_TIMEOUT_MIN		64000
> +#define RT5033_LED_FLASH_TIMEOUT_STEP		32000
> +#define RT5033_LED_FLASH_BRIGHTNESS_MIN		50000
> +#define RT5033_LED_FLASH_BRIGHTNESS_MAX_1CH	600000
> +#define RT5033_LED_FLASH_BRIGHTNESS_MAX_2CH	800000
> +#define RT5033_LED_FLASH_BRIGHTNESS_STEP	25000
> +#define RT5033_LED_TORCH_BRIGHTNESS_MIN		12500
> +#define RT5033_LED_TORCH_BRIGHTNESS_STEP	12500
> +
> +/* Macro to get offset of rt5033_led_config_data */
> +#define RT5033_LED_CONFIG_DATA_OFFSET(val, step, min)	(((val) - (min)) \
> +							/ (step))
> +#define MIN(a, b)		((a) > (b) ? (b) : (a))

Please use min() macro from include/linux/kernel.h

> +#define FLED1_IOUT		(BIT(0))
> +#define FLED2_IOUT		(BIT(1))
> +
> +enum rt5033_fled {
> +	FLED1,
> +	FLED2,
> +};
> +
> +struct rt5033_sub_led {
> +	enum rt5033_fled fled_id;
> +	struct led_classdev_flash fled_cdev;
> +	struct work_struct work_brightness_set;
> +
> +	u32 torch_brightness;
> +	u32 flash_brightness;
> +	u32 flash_timeout;
> +};
> +
> +/* RT5033 Flash led platform data */
> +struct rt5033_led {
> +	struct device *dev;
> +	struct mutex lock;
> +	struct regmap *regmap;
> +	struct rt5033_sub_led sub_leds[2];
> +
> +	u32 iout_torch_max[2];
> +	u32 iout_flash_max[2];

You're not using above two properties anywhere in the driver.

> +	u8 fled_mask;
> +
> +	/* arrangement of current outputs */
> +	bool iout_joint;
> +};
> +
> +struct rt5033_led_config_data {
> +	const char *label[2];
> +	u32 flash_max_microamp[2];
> +	u32 flash_max_timeout[2];
> +	u32 torch_max_microamp[2];
> +	u32 num_leds;
> +};
> +
> +static struct rt5033_sub_led *flcdev_to_sub_led(
> +					struct led_classdev_flash *fled_cdev)
> +{
> +	return container_of(fled_cdev, struct rt5033_sub_led, fled_cdev);
> +}
> +
> +static struct rt5033_led *sub_led_to_led(struct rt5033_sub_led *sub_led)
> +{
> +	return container_of(sub_led, struct rt5033_led,
> +			    sub_leds[sub_led->fled_id]);
> +}
> +
> +static int rt5033_fled_used(struct rt5033_led *led, enum rt5033_fled fled_id)
> +{
> +	u8 fled_bit = (fled_id == FLED1) ? FLED1_IOUT : FLED2_IOUT;
> +
> +	return led->fled_mask & fled_bit;
> +}
> +
> +static void __rt5033_led_brightness_set(struct rt5033_led *led,
> +					enum rt5033_fled fled_id,
> +					enum led_brightness brightness)
> +{
> +	unsigned int val;
> +
> +	mutex_lock(&led->lock);
> +
> +	if (!brightness) {
> +		regmap_read(led->regmap, RT5033_REG_FLED_FUNCTION1, &val);
> +		val &= ~(rt5033_fled_used(led, fled_id));

Please change val type to the one corresponding with the device register
width, i.e. if the register is 8-bit wide, then val should be u8.
Please also calculate the value to write directly here, and not with use
of ~rt5033_fled_used, which returns int and is designed for different
purposes.

> +		regmap_write(led->regmap, RT5033_REG_FLED_FUNCTION1, val);
> +	} else {
> +		regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1,
> +				   RT5033_FLED_FUNC1_MASK, RT5033_FLED_PINCTRL |
> +				   rt5033_fled_used(led, fled_id));
> +		regmap_update_bits(led->regmap,	RT5033_REG_FLED_CTRL1,
> +				   RT5033_FLED_CTRL1_MASK,
> +				   (brightness - 1) << 4);
> +		regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION2,
> +				   RT5033_FLED_FUNC2_MASK, RT5033_FLED_ENFLED);
> +	}

How are you distinguishing between setting brightness for iout_joint
case and for individual LEDs? Have you tested this use case?
Even if you don't have a board with two separate LEDs,
you should be able to test two LED class devices with a single
connected LED.

> +	mutex_unlock(&led->lock);
> +}
> +
> +static void rt5033_led_brightness_set_work(struct work_struct *work)
> +{
> +	struct rt5033_sub_led *sub_led =
> +		container_of(work, struct rt5033_sub_led, work_brightness_set);
> +	struct rt5033_led *led = sub_led_to_led(sub_led);
> +
> +	__rt5033_led_brightness_set(led, sub_led->fled_id,
> +				    sub_led->torch_brightness);
> +}
> +
> +static void rt5033_led_brightness_set(struct led_classdev *led_cdev,
> +				      enum led_brightness brightness)
> +{
> +	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
> +	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
> +
> +	sub_led->torch_brightness = brightness;
> +	schedule_work(&sub_led->work_brightness_set);
> +}
> +
> +static int rt5033_led_brightness_set_sync(struct led_classdev *led_cdev,
> +					  enum led_brightness brightness)
> +{
> +	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
> +	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
> +	struct rt5033_led *led = sub_led_to_led(sub_led);
> +
> +	__rt5033_led_brightness_set(led, sub_led->fled_id, brightness);
> +
> +	return 0;
> +}
> +
> +static int rt5033_led_flash_brightness_set(struct led_classdev_flash *fled_cdev,
> +					   u32 brightness)
> +{
> +	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
> +	struct rt5033_led *led = sub_led_to_led(sub_led);
> +	u32 flash_brightness_offset;
> +
> +	mutex_lock(&led->lock);
> +
> +	flash_brightness_offset =
> +		RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->brightness.val,
> +					      fled_cdev->brightness.step,
> +					      fled_cdev->brightness.min);

Please assign directly to sub_led->flash_brightness.

> +	sub_led->flash_brightness = flash_brightness_offset;
> +
> +	mutex_unlock(&led->lock);
> +
> +	return 0;
> +}
> +
> +static int rt5033_led_flash_timeout_set(struct led_classdev_flash *fled_cdev,
> +					u32 timeout)
> +{
> +	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
> +	struct rt5033_led *led = sub_led_to_led(sub_led);
> +	u32 flash_tm_offset;
> +
> +	mutex_lock(&led->lock);
> +
> +	flash_tm_offset =
> +		RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->timeout.val,
> +					      fled_cdev->timeout.step,
> +					      fled_cdev->timeout.min);

Please assign directly to sub_led->flash_tm_offset.

> +	sub_led->flash_timeout = flash_tm_offset;
> +
> +	mutex_unlock(&led->lock);
> +
> +	return 0;
> +}
> +
> +static int rt5033_led_flash_strobe_set(struct led_classdev_flash *fled_cdev,
> +				       bool state)
> +{
> +	struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
> +	struct rt5033_led *led = sub_led_to_led(sub_led);
> +	enum rt5033_fled fled_id = sub_led->fled_id;
> +	unsigned int val;

mutex_lock is missing here.

> +
> +	regmap_update_bits(led->regmap,	RT5033_REG_FLED_FUNCTION2,
> +			   RT5033_FLED_FUNC2_MASK, 0x0);
> +	if (state) {
> +		regmap_update_bits(led->regmap,	RT5033_REG_FLED_STROBE_CTRL2,
> +				   RT5033_FLED_STRBCTRL2_MASK,
> +				   sub_led->flash_timeout);
> +		regmap_update_bits(led->regmap, RT5033_REG_FLED_STROBE_CTRL1,
> +				   RT5033_FLED_STRBCTRL1_MASK,
> +				   sub_led->flash_brightness);
> +		regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1,
> +				   RT5033_FLED_FUNC1_MASK,
> +				   RT5033_FLED_PINCTRL | RT5033_FLED_STRB_SEL |
> +				   rt5033_fled_used(led, fled_id));
> +		regmap_update_bits(led->regmap,	RT5033_REG_FLED_FUNCTION2,
> +				   RT5033_FLED_FUNC2_MASK, RT5033_FLED_ENFLED
> +				   | RT5033_FLED_SREG_STRB);
> +
> +		regmap_read(led->regmap, RT5033_REG_FLED_FUNCTION1, &val);
> +	}
> +
> +	fled_cdev->led_cdev.brightness = LED_OFF;
> +
> +	mutex_unlock(&led->lock);
> +
> +	return 0;
> +}
> +
> +static const struct led_flash_ops flash_ops = {
> +	.flash_brightness_set = rt5033_led_flash_brightness_set,
> +	.strobe_set = rt5033_led_flash_strobe_set,
> +	.timeout_set = rt5033_led_flash_timeout_set,
> +};
> +
> +static void rt5033_init_flash_properties(struct rt5033_sub_led *sub_led,
> +					 struct rt5033_led_config_data *led_cfg)
> +{
> +	struct led_classdev_flash *fled_cdev = &sub_led->fled_cdev;
> +	struct rt5033_led *led = sub_led_to_led(sub_led);
> +	struct led_flash_setting *tm_set, *fl_set;
> +	enum rt5033_fled fled_id = sub_led->fled_id;
> +
> +	tm_set = &fled_cdev->timeout;
> +	tm_set->min = RT5033_LED_FLASH_TIMEOUT_MIN;
> +	tm_set->max = led_cfg->flash_max_timeout[fled_id];
> +	tm_set->step = RT5033_LED_FLASH_TIMEOUT_STEP;
> +	tm_set->val = tm_set->max;
> +
> +	fl_set = &fled_cdev->brightness;
> +	fl_set->min = RT5033_LED_FLASH_BRIGHTNESS_MIN;
> +	if (led->iout_joint)
> +		fl_set->max = MIN(led_cfg->flash_max_microamp[FLED1] +
> +				  led_cfg->flash_max_microamp[FLED2],
> +				  RT5033_LED_FLASH_BRIGHTNESS_MAX_2CH);
> +	else
> +		fl_set->max = MIN(led_cfg->flash_max_microamp[fled_id],
> +				  RT5033_LED_FLASH_BRIGHTNESS_MAX_1CH);
> +	fl_set->step = RT5033_LED_FLASH_BRIGHTNESS_STEP;
> +	fl_set->val = fl_set->max;
> +}
> +
> +static void rt5033_led_init_fled_cdev(struct rt5033_sub_led *sub_led,
> +				      struct rt5033_led_config_data *led_cfg)
> +{
> +	struct led_classdev_flash *fled_cdev;
> +	struct led_classdev *led_cdev;
> +	enum rt5033_fled fled_id = sub_led->fled_id;
> +	u32 flash_tm_offset, flash_brightness_offset;
> +
> +	/* Initialize LED Flash class device */
> +	fled_cdev = &sub_led->fled_cdev;
> +	fled_cdev->ops = &flash_ops;
> +	led_cdev = &fled_cdev->led_cdev;
> +
> +	led_cdev->name = led_cfg->label[fled_id];
> +
> +	led_cdev->brightness_set = rt5033_led_brightness_set;
> +	led_cdev->brightness_set_sync = rt5033_led_brightness_set_sync;
> +	led_cdev->max_brightness = RT5033_LED_CONFIG_DATA_OFFSET(
> +				   led_cfg->torch_max_microamp[fled_id],
> +				   RT5033_LED_TORCH_BRIGHTNESS_STEP,
> +				   RT5033_LED_TORCH_BRIGHTNESS_MIN);
> +
> +	led_cdev->flags |= LED_DEV_CAP_FLASH;
> +	INIT_WORK(&sub_led->work_brightness_set,
> +		  rt5033_led_brightness_set_work);

Please rebase your code on top of LED tree devel branch:

git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds.git

Those LED core changes will be applied to the for-next branch
in the beginning of the next week, and they'll allow to get rid of
work queues and brightness_set_sync ops from drivers. Please refer
to the patches that remove related code from leds-max77693.c to
find out how to adapt your driver to benefit from LED core
optimizations.


> +	rt5033_init_flash_properties(sub_led, led_cfg);
> +
> +	flash_tm_offset = RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->timeout.val,
> +							fled_cdev->timeout.step,
> +							fled_cdev->timeout.min);
> +	flash_brightness_offset =
> +		RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->brightness.val,
> +					      fled_cdev->brightness.step,
> +					      fled_cdev->brightness.min);
> +
> +	sub_led->flash_timeout = flash_tm_offset;
> +	sub_led->flash_brightness = flash_brightness_offset;
> +}
> +
> +static int rt5033_led_parse_dt(struct rt5033_led *led, struct device *dev,
> +			       struct rt5033_led_config_data *cfg,
> +			       struct device_node **sub_nodes)
> +{
> +	struct device_node *np = dev->of_node;
> +	struct device_node *child_node;
> +	struct rt5033_sub_led *sub_leds = led->sub_leds;
> +	struct property *prop;
> +	u32 led_sources[2];
> +	enum rt5033_fled fled_id;
> +	int i, ret;
> +
> +	if (!np)
> +		return -ENXIO;

Probe has been called, so dev->of_node must have been present.
Please remove above guard.

> +	for_each_available_child_of_node(np, child_node) {
> +		prop = of_find_property(child_node, "led-sources", NULL);
> +		if (prop) {
> +			const u32 *srcs = NULL;

This should be:

const __be32 *srcs = NULL;

sparse tool detects this type of problems [1].

> +
> +			for (i = 0; i < ARRAY_SIZE(led_sources); ++i) {
> +				srcs = of_prop_next_u32(prop, srcs,
> +							&led_sources[i]);
> +				if (!srcs)
> +					break;
> +			}
> +		} else {
> +			dev_err(dev, "led-sources DT property missing\n");
> +			ret = -EINVAL;
> +			goto err_parse_dt;
> +		}
> +
> +		if (i == 2) {
> +			fled_id = FLED1;
> +			led->fled_mask = FLED1_IOUT | FLED2_IOUT;
> +		} else if (led_sources[0] == FLED1) {
> +			fled_id = FLED1;
> +			led->fled_mask |= FLED1_IOUT;
> +		} else if (led_sources[0] == FLED2) {
> +			fled_id = FLED2;
> +			led->fled_mask |= FLED2_IOUT;
> +		} else {
> +			dev_err(dev, "Wrong led-sources DT property value.\n");
> +			ret = -EINVAL;
> +			goto err_parse_dt;
> +		}
> +
> +		if (sub_nodes[fled_id]) {
> +			dev_err(dev,
> +				"Conflicting \"led-sources\" DT properties\n");
> +			ret = -EINVAL;
> +			goto err_parse_dt;
> +		}
> +
> +		sub_nodes[fled_id] = child_node;
> +		sub_leds[fled_id].fled_id = fled_id;
> +
> +		cfg->label[fled_id] =
> +			of_get_property(child_node, "label", NULL) ? :
> +					child_node->name;
> +
> +		ret = of_property_read_u32(child_node, "led-max-microamp",
> +					   &cfg->torch_max_microamp[fled_id]);
> +		if (ret) {
> +			dev_err(dev, "failed to parse led-max-microamp\n");
> +			goto err_parse_dt;
> +		}
> +
> +		ret = of_property_read_u32(child_node, "flash-max-microamp",
> +					   &cfg->flash_max_microamp[fled_id]);
> +		if (ret) {
> +			dev_err(dev, "failed to parse flash-max-microamp\n");
> +			goto err_parse_dt;
> +		}
> +
> +		ret = of_property_read_u32(child_node, "flash-max-timeout-us",
> +					   &cfg->flash_max_timeout[fled_id]);
> +		if (ret) {
> +			dev_err(dev, "failed to parse flash-max-timeout-us\n");
> +			goto err_parse_dt;
> +		}
> +
> +		if (++cfg->num_leds == 2 ||
> +		    (rt5033_fled_used(led, FLED1) &&
> +		     rt5033_fled_used(led, FLED2))) {
> +			of_node_put(child_node);
> +			break;
> +		}
> +	}
> +
> +	if (cfg->num_leds == 0) {
> +		dev_err(dev, "No DT child node found for connected LED(s).\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +
> +err_parse_dt:
> +	of_node_put(child_node);
> +	return ret;
> +}
> +
> +static int rt5033_led_probe(struct platform_device *pdev)
> +{
> +	struct rt5033_dev *rt5033 = dev_get_drvdata(pdev->dev.parent);
> +	struct rt5033_led *led;
> +	struct rt5033_sub_led *sub_leds;
> +	struct device_node *sub_nodes[2] = {};
> +	struct rt5033_led_config_data led_cfg = {};
> +	int init_fled_cdev[2], i, ret;
> +
> +	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
> +	if (!led)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, led);
> +	led->dev = &pdev->dev;
> +	led->regmap = rt5033->regmap;
> +	sub_leds = led->sub_leds;
> +
> +	ret = rt5033_led_parse_dt(led, &pdev->dev, &led_cfg, sub_nodes);
> +	if (ret)
> +		return ret;
> +
> +	if (led_cfg.num_leds == 1 && rt5033_fled_used(led, FLED1) &&
> +	    rt5033_fled_used(led, FLED2))
> +		led->iout_joint = true;
> +
> +	mutex_init(&led->lock);
> +
> +	init_fled_cdev[FLED1] =
> +			led->iout_joint || rt5033_fled_used(led, FLED1);
> +	init_fled_cdev[FLED2] =
> +			!led->iout_joint && rt5033_fled_used(led, FLED2);
> +
> +	for (i = FLED1; i <= FLED2; ++i) {
> +		if (!init_fled_cdev[i])
> +			continue;
> +
> +		rt5033_led_init_fled_cdev(&sub_leds[i], &led_cfg);
> +		ret = led_classdev_flash_register(led->dev,
> +						  &sub_leds[i].fled_cdev);
> +		if (ret < 0) {
> +			if (i == FLED2)
> +				goto err_register_led2;
> +			else
> +				goto err_register_led1;
> +		}
> +	}
> +
> +	regmap_update_bits(led->regmap,	RT5033_REG_FLED_FUNCTION1,
> +			   RT5033_FLED_FUNC1_MASK, RT5033_FLED_RESET);
> +
> +	return 0;
> +
> +err_register_led2:
> +	led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev);
> +err_register_led1:
> +	mutex_destroy(&led->lock);
> +
> +	return ret;
> +}
> +
> +static int rt5033_led_remove(struct platform_device *pdev)
> +{
> +	struct rt5033_led *led = platform_get_drvdata(pdev);
> +	struct rt5033_sub_led *sub_leds = led->sub_leds;
> +
> +	if (led->iout_joint || rt5033_fled_used(led, FLED1)) {
> +		led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev);
> +		cancel_work_sync(&sub_leds[FLED1].work_brightness_set);
> +	}
> +
> +	if (!led->iout_joint && rt5033_fled_used(led, FLED2)) {
> +		led_classdev_flash_unregister(&sub_leds[FLED2].fled_cdev);
> +		cancel_work_sync(&sub_leds[FLED2].work_brightness_set);
> +	}
> +
> +	mutex_destroy(&led->lock);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id rt5033_led_match[] = {
> +	{ .compatible = "richtek,rt5033-led", },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, rt5033_led_match);
> +
> +static struct platform_driver rt5033_led_driver = {
> +	.driver = {
> +		.name = "rt5033-led",
> +		.of_match_table = rt5033_led_match,
> +	},
> +	.probe		= rt5033_led_probe,
> +	.remove		= rt5033_led_remove,
> +};
> +module_platform_driver(rt5033_led_driver);
> +
> +MODULE_AUTHOR("Ingi Kim <ingi2.kim@samsung.com>");
> +MODULE_DESCRIPTION("Richtek RT5033 LED driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:rt5033-led");
> diff --git a/include/linux/mfd/rt5033-private.h b/include/linux/mfd/rt5033-private.h
> index 1b63fc2..b20c7e4 100644
> --- a/include/linux/mfd/rt5033-private.h
> +++ b/include/linux/mfd/rt5033-private.h
> @@ -93,6 +93,57 @@ enum rt5033_reg {
>   #define RT5033_RT_CTRL1_UUG_MASK	0x02
>   #define RT5033_RT_HZ_MASK		0x01
>
> +/* RT5033 FLED Function1 register */
> +#define RT5033_FLED_FUNC1_MASK		0x97
> +#define RT5033_FLED_EN_LEDCS1		0x01
> +#define RT5033_FLED_EN_LEDCS2		0x02
> +#define RT5033_FLED_STRB_SEL		0x04
> +#define RT5033_FLED_PINCTRL		0x10
> +#define RT5033_FLED_RESET		0x80
> +
> +/* RT5033 FLED Function2 register */
> +#define RT5033_FLED_FUNC2_MASK		0x81
> +#define RT5033_FLED_ENFLED		0x01
> +#define RT5033_FLED_SREG_STRB		0x80
> +
> +/* RT5033 FLED Strobe Control1 */
> +#define RT5033_FLED_STRBCTRL1_MASK		0xFF
> +#define RT5033_FLED_STRBCTRL1_TM_CUR_MAX	0xE0
> +#define RT5033_FLED_STRBCTRL1_FL_CUR_DEF	0x0D
> +#define RT5033_FLED_STRBCTRL1_FL_CUR_MAX	0x1F
> +
> +/* RT5033 FLED Strobe Control2 */
> +#define RT5033_FLED_STRBCTRL2_MASK	0x3F
> +#define RT5033_FLED_STRBCTRL2_TM_DEF	0x0F
> +#define RT5033_FLED_STRBCTRL2_TM_MAX	0x3F
> +
> +/* RT5033 FLED Control1 */
> +#define RT5033_FLED_CTRL1_MASK		0xF7
> +#define RT5033_FLED_CTRL1_TORCH_CUR_DEF	0x20
> +#define RT5033_FLED_CTRL1_TORCH_CUR_MAX	0xF0
> +#define RT5033_FLED_CTRL1_LBP_DEF	0x02
> +#define RT5033_FLED_CTRL1_LBP_MAX	0x07
> +
> +/* RT5033 FLED Control2 */
> +#define RT5033_FLED_CTRL2_MASK		0xFF
> +#define RT5033_FLED_CTRL2_VMID_DEF	0x37
> +#define RT5033_FLED_CTRL2_VMID_MAX	0x3F
> +#define RT5033_FLED_CTRL2_TRACK_ALIVE	0x40
> +#define RT5033_FLED_CTRL2_MID_TRACK	0x80
> +
> +/* RT5033 FLED Control4 */
> +#define RT5033_FLED_CTRL4_MASK		0xE0
> +#define RT5033_FLED_CTRL4_RESV		0x14
> +#define RT5033_FLED_CTRL4_VTRREG_DEF	0x40
> +#define RT5033_FLED_CTRL4_VTRREG_MAX	0x60
> +#define RT5033_FLED_CTRL4_TRACK_CLK	0x80
> +
> +/* RT5033 FLED Control5 */
> +#define RT5033_FLED_CTRL5_MASK		0xC0
> +#define RT5033_FLED_CTRL5_RESV		0x10
> +#define RT5033_FLED_CTRL5_TA_GOOD	0x40
> +#define RT5033_FLED_CTRL5_TA_EXIST	0x80
> +
>   /* RT5033 control register */
>   #define RT5033_CTRL_FCCM_BUCK_MASK		0x00
>   #define RT5033_CTRL_BUCKOMS_MASK		0x01
>

[1] Documentation/sparse.txt

-- 
Best Regards,
Jacek Anaszewski

Re: [PATCH v4 2/2] leds: rt5033: Add RT5033 Flash led device driver

[Ingi Kim]

Hi Jacek,

Thanks for the review.
your feedback is highly appreciated :)
I'll send next patch set soon.

On 2015년 11월 11일 01:30, Jacek Anaszewski wrote:
> Hi Ingi,
> 
> Thanks for the update. Please find my comments below.
> 
> On 11/10/2015 03:17 AM, Ingi Kim wrote:
>> This patch adds device driver of Richtek RT5033 PMIC.
>> The driver supports a current regulated output to drive white LEDs.
> 
> I would add here also the part from leds-rt5033.txt header.
> 

Okay. I will add.

>>
>> Signed-off-by: Ingi Kim <ingi2.kim@samsung.com>
>> ---
>>   drivers/leds/Kconfig               |   8 +
>>   drivers/leds/Makefile              |   1 +
>>   drivers/leds/leds-rt5033.c         | 502 +++++++++++++++++++++++++++++++++++++
>>   include/linux/mfd/rt5033-private.h |  51 ++++
>>   4 files changed, 562 insertions(+)
>>   create mode 100644 drivers/leds/leds-rt5033.c
>>
>> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
>> index 42990f2..29613e3 100644
>> --- a/drivers/leds/Kconfig
>> +++ b/drivers/leds/Kconfig
>> @@ -345,6 +345,14 @@ config LEDS_PCA963X
>>         LED driver chip accessed via the I2C bus. Supported
>>         devices include PCA9633 and PCA9634
>>
>> +config LEDS_RT5033
>> +    tristate "LED support for RT5033 PMIC"
>> +    depends on LEDS_CLASS_FLASH && OF
>> +    depends on MFD_RT5033
>> +    help
>> +      This option enables support for on-chip LED driver on
>> +      RT5033 PMIC.
>> +
>>   config LEDS_WM831X_STATUS
>>       tristate "LED support for status LEDs on WM831x PMICs"
>>       depends on LEDS_CLASS
>> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
>> index b503f92..bcc4d93 100644
>> --- a/drivers/leds/Makefile
>> +++ b/drivers/leds/Makefile
>> @@ -23,6 +23,7 @@ obj-$(CONFIG_LEDS_COBALT_QUBE)        += leds-cobalt-qube.o
>>   obj-$(CONFIG_LEDS_COBALT_RAQ)        += leds-cobalt-raq.o
>>   obj-$(CONFIG_LEDS_SUNFIRE)        += leds-sunfire.o
>>   obj-$(CONFIG_LEDS_PCA9532)        += leds-pca9532.o
>> +obj-$(CONFIG_LEDS_RT5033)        += leds-rt5033.o
>>   obj-$(CONFIG_LEDS_GPIO_REGISTER)    += leds-gpio-register.o
>>   obj-$(CONFIG_LEDS_GPIO)            += leds-gpio.o
>>   obj-$(CONFIG_LEDS_LP3944)        += leds-lp3944.o
>> diff --git a/drivers/leds/leds-rt5033.c b/drivers/leds/leds-rt5033.c
>> new file mode 100644
>> index 0000000..eb89731
>> --- /dev/null
>> +++ b/drivers/leds/leds-rt5033.c
>> @@ -0,0 +1,502 @@
>> +/*
>> + * led driver for RT5033
>> + *
>> + * Copyright (C) 2015 Samsung Electronics, Co., Ltd.
>> + * Ingi Kim <ingi2.kim@samsung.com>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + *
>> + */
>> +
>> +#include <linux/led-class-flash.h>
>> +#include <linux/mfd/rt5033.h>
>> +#include <linux/mfd/rt5033-private.h>
>> +#include <linux/module.h>
>> +#include <linux/mutex.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/workqueue.h>
>> +
>> +#define RT5033_LED_FLASH_TIMEOUT_MIN        64000
>> +#define RT5033_LED_FLASH_TIMEOUT_STEP        32000
>> +#define RT5033_LED_FLASH_BRIGHTNESS_MIN        50000
>> +#define RT5033_LED_FLASH_BRIGHTNESS_MAX_1CH    600000
>> +#define RT5033_LED_FLASH_BRIGHTNESS_MAX_2CH    800000
>> +#define RT5033_LED_FLASH_BRIGHTNESS_STEP    25000
>> +#define RT5033_LED_TORCH_BRIGHTNESS_MIN        12500
>> +#define RT5033_LED_TORCH_BRIGHTNESS_STEP    12500
>> +
>> +/* Macro to get offset of rt5033_led_config_data */
>> +#define RT5033_LED_CONFIG_DATA_OFFSET(val, step, min)    (((val) - (min)) \
>> +                            / (step))
>> +#define MIN(a, b)        ((a) > (b) ? (b) : (a))
> 
> Please use min() macro from include/linux/kernel.h
> 

Oh, I'll check.

>> +#define FLED1_IOUT        (BIT(0))
>> +#define FLED2_IOUT        (BIT(1))
>> +
>> +enum rt5033_fled {
>> +    FLED1,
>> +    FLED2,
>> +};
>> +
>> +struct rt5033_sub_led {
>> +    enum rt5033_fled fled_id;
>> +    struct led_classdev_flash fled_cdev;
>> +    struct work_struct work_brightness_set;
>> +
>> +    u32 torch_brightness;
>> +    u32 flash_brightness;
>> +    u32 flash_timeout;
>> +};
>> +
>> +/* RT5033 Flash led platform data */
>> +struct rt5033_led {
>> +    struct device *dev;
>> +    struct mutex lock;
>> +    struct regmap *regmap;
>> +    struct rt5033_sub_led sub_leds[2];
>> +
>> +    u32 iout_torch_max[2];
>> +    u32 iout_flash_max[2];
> 
> You're not using above two properties anywhere in the driver.
> 

Thanks, I'll Remove it.

>> +    u8 fled_mask;
>> +
>> +    /* arrangement of current outputs */
>> +    bool iout_joint;
>> +};
>> +
>> +struct rt5033_led_config_data {
>> +    const char *label[2];
>> +    u32 flash_max_microamp[2];
>> +    u32 flash_max_timeout[2];
>> +    u32 torch_max_microamp[2];
>> +    u32 num_leds;
>> +};
>> +
>> +static struct rt5033_sub_led *flcdev_to_sub_led(
>> +                    struct led_classdev_flash *fled_cdev)
>> +{
>> +    return container_of(fled_cdev, struct rt5033_sub_led, fled_cdev);
>> +}
>> +
>> +static struct rt5033_led *sub_led_to_led(struct rt5033_sub_led *sub_led)
>> +{
>> +    return container_of(sub_led, struct rt5033_led,
>> +                sub_leds[sub_led->fled_id]);
>> +}
>> +
>> +static int rt5033_fled_used(struct rt5033_led *led, enum rt5033_fled fled_id)
>> +{
>> +    u8 fled_bit = (fled_id == FLED1) ? FLED1_IOUT : FLED2_IOUT;
>> +
>> +    return led->fled_mask & fled_bit;
>> +}
>> +
>> +static void __rt5033_led_brightness_set(struct rt5033_led *led,
>> +                    enum rt5033_fled fled_id,
>> +                    enum led_brightness brightness)
>> +{
>> +    unsigned int val;
>> +
>> +    mutex_lock(&led->lock);
>> +
>> +    if (!brightness) {
>> +        regmap_read(led->regmap, RT5033_REG_FLED_FUNCTION1, &val);
>> +        val &= ~(rt5033_fled_used(led, fled_id));
> 
> Please change val type to the one corresponding with the device register
> width, i.e. if the register is 8-bit wide, then val should be u8.
> Please also calculate the value to write directly here, and not with use
> of ~rt5033_fled_used, which returns int and is designed for different
> purposes.
> 

Oh, I misused above function.
Thanks for the comment.

>> +        regmap_write(led->regmap, RT5033_REG_FLED_FUNCTION1, val);
>> +    } else {
>> +        regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1,
>> +                   RT5033_FLED_FUNC1_MASK, RT5033_FLED_PINCTRL |
>> +                   rt5033_fled_used(led, fled_id));
>> +        regmap_update_bits(led->regmap,    RT5033_REG_FLED_CTRL1,
>> +                   RT5033_FLED_CTRL1_MASK,
>> +                   (brightness - 1) << 4);
>> +        regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION2,
>> +                   RT5033_FLED_FUNC2_MASK, RT5033_FLED_ENFLED);
>> +    }
> 
> How are you distinguishing between setting brightness for iout_joint
> case and for individual LEDs? Have you tested this use case?
> Even if you don't have a board with two separate LEDs,
> you should be able to test two LED class devices with a single
> connected LED.
> 

Thanks, I missed a iout_joint case :(
I have tested a board with integrated single LED,
It looks fine and all feature works well even if it has limitation.

>> +    mutex_unlock(&led->lock);
>> +}
>> +
>> +static void rt5033_led_brightness_set_work(struct work_struct *work)
>> +{
>> +    struct rt5033_sub_led *sub_led =
>> +        container_of(work, struct rt5033_sub_led, work_brightness_set);
>> +    struct rt5033_led *led = sub_led_to_led(sub_led);
>> +
>> +    __rt5033_led_brightness_set(led, sub_led->fled_id,
>> +                    sub_led->torch_brightness);
>> +}
>> +
>> +static void rt5033_led_brightness_set(struct led_classdev *led_cdev,
>> +                      enum led_brightness brightness)
>> +{
>> +    struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
>> +    struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
>> +
>> +    sub_led->torch_brightness = brightness;
>> +    schedule_work(&sub_led->work_brightness_set);
>> +}
>> +
>> +static int rt5033_led_brightness_set_sync(struct led_classdev *led_cdev,
>> +                      enum led_brightness brightness)
>> +{
>> +    struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
>> +    struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
>> +    struct rt5033_led *led = sub_led_to_led(sub_led);
>> +
>> +    __rt5033_led_brightness_set(led, sub_led->fled_id, brightness);
>> +
>> +    return 0;
>> +}
>> +
>> +static int rt5033_led_flash_brightness_set(struct led_classdev_flash *fled_cdev,
>> +                       u32 brightness)
>> +{
>> +    struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
>> +    struct rt5033_led *led = sub_led_to_led(sub_led);
>> +    u32 flash_brightness_offset;
>> +
>> +    mutex_lock(&led->lock);
>> +
>> +    flash_brightness_offset =
>> +        RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->brightness.val,
>> +                          fled_cdev->brightness.step,
>> +                          fled_cdev->brightness.min);
> 
> Please assign directly to sub_led->flash_brightness.
> 

Okay, I'll do.
Thanks.

>> +    sub_led->flash_brightness = flash_brightness_offset;
>> +
>> +    mutex_unlock(&led->lock);
>> +
>> +    return 0;
>> +}
>> +
>> +static int rt5033_led_flash_timeout_set(struct led_classdev_flash *fled_cdev,
>> +                    u32 timeout)
>> +{
>> +    struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
>> +    struct rt5033_led *led = sub_led_to_led(sub_led);
>> +    u32 flash_tm_offset;
>> +
>> +    mutex_lock(&led->lock);
>> +
>> +    flash_tm_offset =
>> +        RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->timeout.val,
>> +                          fled_cdev->timeout.step,
>> +                          fled_cdev->timeout.min);
> 
> Please assign directly to sub_led->flash_tm_offset.
> 

Okay, I'll do.
Thanks.

>> +    sub_led->flash_timeout = flash_tm_offset;
>> +
>> +    mutex_unlock(&led->lock);
>> +
>> +    return 0;
>> +}
>> +
>> +static int rt5033_led_flash_strobe_set(struct led_classdev_flash *fled_cdev,
>> +                       bool state)
>> +{
>> +    struct rt5033_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
>> +    struct rt5033_led *led = sub_led_to_led(sub_led);
>> +    enum rt5033_fled fled_id = sub_led->fled_id;
>> +    unsigned int val;
> 
> mutex_lock is missing here.
> 

Oh, I missed.
Thanks.

>> +
>> +    regmap_update_bits(led->regmap,    RT5033_REG_FLED_FUNCTION2,
>> +               RT5033_FLED_FUNC2_MASK, 0x0);
>> +    if (state) {
>> +        regmap_update_bits(led->regmap,    RT5033_REG_FLED_STROBE_CTRL2,
>> +                   RT5033_FLED_STRBCTRL2_MASK,
>> +                   sub_led->flash_timeout);
>> +        regmap_update_bits(led->regmap, RT5033_REG_FLED_STROBE_CTRL1,
>> +                   RT5033_FLED_STRBCTRL1_MASK,
>> +                   sub_led->flash_brightness);
>> +        regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1,
>> +                   RT5033_FLED_FUNC1_MASK,
>> +                   RT5033_FLED_PINCTRL | RT5033_FLED_STRB_SEL |
>> +                   rt5033_fled_used(led, fled_id));
>> +        regmap_update_bits(led->regmap,    RT5033_REG_FLED_FUNCTION2,
>> +                   RT5033_FLED_FUNC2_MASK, RT5033_FLED_ENFLED
>> +                   | RT5033_FLED_SREG_STRB);
>> +
>> +        regmap_read(led->regmap, RT5033_REG_FLED_FUNCTION1, &val);
>> +    }
>> +
>> +    fled_cdev->led_cdev.brightness = LED_OFF;
>> +
>> +    mutex_unlock(&led->lock);
>> +
>> +    return 0;
>> +}
>> +
>> +static const struct led_flash_ops flash_ops = {
>> +    .flash_brightness_set = rt5033_led_flash_brightness_set,
>> +    .strobe_set = rt5033_led_flash_strobe_set,
>> +    .timeout_set = rt5033_led_flash_timeout_set,
>> +};
>> +
>> +static void rt5033_init_flash_properties(struct rt5033_sub_led *sub_led,
>> +                     struct rt5033_led_config_data *led_cfg)
>> +{
>> +    struct led_classdev_flash *fled_cdev = &sub_led->fled_cdev;
>> +    struct rt5033_led *led = sub_led_to_led(sub_led);
>> +    struct led_flash_setting *tm_set, *fl_set;
>> +    enum rt5033_fled fled_id = sub_led->fled_id;
>> +
>> +    tm_set = &fled_cdev->timeout;
>> +    tm_set->min = RT5033_LED_FLASH_TIMEOUT_MIN;
>> +    tm_set->max = led_cfg->flash_max_timeout[fled_id];
>> +    tm_set->step = RT5033_LED_FLASH_TIMEOUT_STEP;
>> +    tm_set->val = tm_set->max;
>> +
>> +    fl_set = &fled_cdev->brightness;
>> +    fl_set->min = RT5033_LED_FLASH_BRIGHTNESS_MIN;
>> +    if (led->iout_joint)
>> +        fl_set->max = MIN(led_cfg->flash_max_microamp[FLED1] +
>> +                  led_cfg->flash_max_microamp[FLED2],
>> +                  RT5033_LED_FLASH_BRIGHTNESS_MAX_2CH);
>> +    else
>> +        fl_set->max = MIN(led_cfg->flash_max_microamp[fled_id],
>> +                  RT5033_LED_FLASH_BRIGHTNESS_MAX_1CH);
>> +    fl_set->step = RT5033_LED_FLASH_BRIGHTNESS_STEP;
>> +    fl_set->val = fl_set->max;
>> +}
>> +
>> +static void rt5033_led_init_fled_cdev(struct rt5033_sub_led *sub_led,
>> +                      struct rt5033_led_config_data *led_cfg)
>> +{
>> +    struct led_classdev_flash *fled_cdev;
>> +    struct led_classdev *led_cdev;
>> +    enum rt5033_fled fled_id = sub_led->fled_id;
>> +    u32 flash_tm_offset, flash_brightness_offset;
>> +
>> +    /* Initialize LED Flash class device */
>> +    fled_cdev = &sub_led->fled_cdev;
>> +    fled_cdev->ops = &flash_ops;
>> +    led_cdev = &fled_cdev->led_cdev;
>> +
>> +    led_cdev->name = led_cfg->label[fled_id];
>> +
>> +    led_cdev->brightness_set = rt5033_led_brightness_set;
>> +    led_cdev->brightness_set_sync = rt5033_led_brightness_set_sync;
>> +    led_cdev->max_brightness = RT5033_LED_CONFIG_DATA_OFFSET(
>> +                   led_cfg->torch_max_microamp[fled_id],
>> +                   RT5033_LED_TORCH_BRIGHTNESS_STEP,
>> +                   RT5033_LED_TORCH_BRIGHTNESS_MIN);
>> +
>> +    led_cdev->flags |= LED_DEV_CAP_FLASH;
>> +    INIT_WORK(&sub_led->work_brightness_set,
>> +          rt5033_led_brightness_set_work);
> 
> Please rebase your code on top of LED tree devel branch:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds.git
> 
> Those LED core changes will be applied to the for-next branch
> in the beginning of the next week, and they'll allow to get rid of
> work queues and brightness_set_sync ops from drivers. Please refer
> to the patches that remove related code from leds-max77693.c to
> find out how to adapt your driver to benefit from LED core
> optimizations.
> 
> 

Okay, I'll see a patch above and fix it.
Thanks

>> +    rt5033_init_flash_properties(sub_led, led_cfg);
>> +
>> +    flash_tm_offset = RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->timeout.val,
>> +                            fled_cdev->timeout.step,
>> +                            fled_cdev->timeout.min);
>> +    flash_brightness_offset =
>> +        RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->brightness.val,
>> +                          fled_cdev->brightness.step,
>> +                          fled_cdev->brightness.min);
>> +
>> +    sub_led->flash_timeout = flash_tm_offset;
>> +    sub_led->flash_brightness = flash_brightness_offset;
>> +}
>> +
>> +static int rt5033_led_parse_dt(struct rt5033_led *led, struct device *dev,
>> +                   struct rt5033_led_config_data *cfg,
>> +                   struct device_node **sub_nodes)
>> +{
>> +    struct device_node *np = dev->of_node;
>> +    struct device_node *child_node;
>> +    struct rt5033_sub_led *sub_leds = led->sub_leds;
>> +    struct property *prop;
>> +    u32 led_sources[2];
>> +    enum rt5033_fled fled_id;
>> +    int i, ret;
>> +
>> +    if (!np)
>> +        return -ENXIO;
> 
> Probe has been called, so dev->of_node must have been present.
> Please remove above guard.
> 

Right, dev->of_node is checked before.
Thanks. 

>> +    for_each_available_child_of_node(np, child_node) {
>> +        prop = of_find_property(child_node, "led-sources", NULL);
>> +        if (prop) {
>> +            const u32 *srcs = NULL;
> 
> This should be:
> 
> const __be32 *srcs = NULL;
> 
> sparse tool detects this type of problems [1].
> 

Oh, I see. I didn't know about that.
Thanks.

>> +
>> +            for (i = 0; i < ARRAY_SIZE(led_sources); ++i) {
>> +                srcs = of_prop_next_u32(prop, srcs,
>> +                            &led_sources[i]);
>> +                if (!srcs)
>> +                    break;
>> +            }
>> +        } else {
>> +            dev_err(dev, "led-sources DT property missing\n");
>> +            ret = -EINVAL;
>> +            goto err_parse_dt;
>> +        }
>> +
>> +        if (i == 2) {
>> +            fled_id = FLED1;
>> +            led->fled_mask = FLED1_IOUT | FLED2_IOUT;
>> +        } else if (led_sources[0] == FLED1) {
>> +            fled_id = FLED1;
>> +            led->fled_mask |= FLED1_IOUT;
>> +        } else if (led_sources[0] == FLED2) {
>> +            fled_id = FLED2;
>> +            led->fled_mask |= FLED2_IOUT;
>> +        } else {
>> +            dev_err(dev, "Wrong led-sources DT property value.\n");
>> +            ret = -EINVAL;
>> +            goto err_parse_dt;
>> +        }
>> +
>> +        if (sub_nodes[fled_id]) {
>> +            dev_err(dev,
>> +                "Conflicting \"led-sources\" DT properties\n");
>> +            ret = -EINVAL;
>> +            goto err_parse_dt;
>> +        }
>> +
>> +        sub_nodes[fled_id] = child_node;
>> +        sub_leds[fled_id].fled_id = fled_id;
>> +
>> +        cfg->label[fled_id] =
>> +            of_get_property(child_node, "label", NULL) ? :
>> +                    child_node->name;
>> +
>> +        ret = of_property_read_u32(child_node, "led-max-microamp",
>> +                       &cfg->torch_max_microamp[fled_id]);
>> +        if (ret) {
>> +            dev_err(dev, "failed to parse led-max-microamp\n");
>> +            goto err_parse_dt;
>> +        }
>> +
>> +        ret = of_property_read_u32(child_node, "flash-max-microamp",
>> +                       &cfg->flash_max_microamp[fled_id]);
>> +        if (ret) {
>> +            dev_err(dev, "failed to parse flash-max-microamp\n");
>> +            goto err_parse_dt;
>> +        }
>> +
>> +        ret = of_property_read_u32(child_node, "flash-max-timeout-us",
>> +                       &cfg->flash_max_timeout[fled_id]);
>> +        if (ret) {
>> +            dev_err(dev, "failed to parse flash-max-timeout-us\n");
>> +            goto err_parse_dt;
>> +        }
>> +
>> +        if (++cfg->num_leds == 2 ||
>> +            (rt5033_fled_used(led, FLED1) &&
>> +             rt5033_fled_used(led, FLED2))) {
>> +            of_node_put(child_node);
>> +            break;
>> +        }
>> +    }
>> +
>> +    if (cfg->num_leds == 0) {
>> +        dev_err(dev, "No DT child node found for connected LED(s).\n");
>> +        return -EINVAL;
>> +    }
>> +
>> +    return 0;
>> +
>> +err_parse_dt:
>> +    of_node_put(child_node);
>> +    return ret;
>> +}
>> +
>> +static int rt5033_led_probe(struct platform_device *pdev)
>> +{
>> +    struct rt5033_dev *rt5033 = dev_get_drvdata(pdev->dev.parent);
>> +    struct rt5033_led *led;
>> +    struct rt5033_sub_led *sub_leds;
>> +    struct device_node *sub_nodes[2] = {};
>> +    struct rt5033_led_config_data led_cfg = {};
>> +    int init_fled_cdev[2], i, ret;
>> +
>> +    led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
>> +    if (!led)
>> +        return -ENOMEM;
>> +
>> +    platform_set_drvdata(pdev, led);
>> +    led->dev = &pdev->dev;
>> +    led->regmap = rt5033->regmap;
>> +    sub_leds = led->sub_leds;
>> +
>> +    ret = rt5033_led_parse_dt(led, &pdev->dev, &led_cfg, sub_nodes);
>> +    if (ret)
>> +        return ret;
>> +
>> +    if (led_cfg.num_leds == 1 && rt5033_fled_used(led, FLED1) &&
>> +        rt5033_fled_used(led, FLED2))
>> +        led->iout_joint = true;
>> +
>> +    mutex_init(&led->lock);
>> +
>> +    init_fled_cdev[FLED1] =
>> +            led->iout_joint || rt5033_fled_used(led, FLED1);
>> +    init_fled_cdev[FLED2] =
>> +            !led->iout_joint && rt5033_fled_used(led, FLED2);
>> +
>> +    for (i = FLED1; i <= FLED2; ++i) {
>> +        if (!init_fled_cdev[i])
>> +            continue;
>> +
>> +        rt5033_led_init_fled_cdev(&sub_leds[i], &led_cfg);
>> +        ret = led_classdev_flash_register(led->dev,
>> +                          &sub_leds[i].fled_cdev);
>> +        if (ret < 0) {
>> +            if (i == FLED2)
>> +                goto err_register_led2;
>> +            else
>> +                goto err_register_led1;
>> +        }
>> +    }
>> +
>> +    regmap_update_bits(led->regmap,    RT5033_REG_FLED_FUNCTION1,
>> +               RT5033_FLED_FUNC1_MASK, RT5033_FLED_RESET);
>> +
>> +    return 0;
>> +
>> +err_register_led2:
>> +    led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev);
>> +err_register_led1:
>> +    mutex_destroy(&led->lock);
>> +
>> +    return ret;
>> +}
>> +
>> +static int rt5033_led_remove(struct platform_device *pdev)
>> +{
>> +    struct rt5033_led *led = platform_get_drvdata(pdev);
>> +    struct rt5033_sub_led *sub_leds = led->sub_leds;
>> +
>> +    if (led->iout_joint || rt5033_fled_used(led, FLED1)) {
>> +        led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev);
>> +        cancel_work_sync(&sub_leds[FLED1].work_brightness_set);
>> +    }
>> +
>> +    if (!led->iout_joint && rt5033_fled_used(led, FLED2)) {
>> +        led_classdev_flash_unregister(&sub_leds[FLED2].fled_cdev);
>> +        cancel_work_sync(&sub_leds[FLED2].work_brightness_set);
>> +    }
>> +
>> +    mutex_destroy(&led->lock);
>> +
>> +    return 0;
>> +}
>> +
>> +static const struct of_device_id rt5033_led_match[] = {
>> +    { .compatible = "richtek,rt5033-led", },
>> +    { /* sentinel */ },
>> +};
>> +MODULE_DEVICE_TABLE(of, rt5033_led_match);
>> +
>> +static struct platform_driver rt5033_led_driver = {
>> +    .driver = {
>> +        .name = "rt5033-led",
>> +        .of_match_table = rt5033_led_match,
>> +    },
>> +    .probe        = rt5033_led_probe,
>> +    .remove        = rt5033_led_remove,
>> +};
>> +module_platform_driver(rt5033_led_driver);
>> +
>> +MODULE_AUTHOR("Ingi Kim <ingi2.kim@samsung.com>");
>> +MODULE_DESCRIPTION("Richtek RT5033 LED driver");
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_ALIAS("platform:rt5033-led");
>> diff --git a/include/linux/mfd/rt5033-private.h b/include/linux/mfd/rt5033-private.h
>> index 1b63fc2..b20c7e4 100644
>> --- a/include/linux/mfd/rt5033-private.h
>> +++ b/include/linux/mfd/rt5033-private.h
>> @@ -93,6 +93,57 @@ enum rt5033_reg {
>>   #define RT5033_RT_CTRL1_UUG_MASK    0x02
>>   #define RT5033_RT_HZ_MASK        0x01
>>
>> +/* RT5033 FLED Function1 register */
>> +#define RT5033_FLED_FUNC1_MASK        0x97
>> +#define RT5033_FLED_EN_LEDCS1        0x01
>> +#define RT5033_FLED_EN_LEDCS2        0x02
>> +#define RT5033_FLED_STRB_SEL        0x04
>> +#define RT5033_FLED_PINCTRL        0x10
>> +#define RT5033_FLED_RESET        0x80
>> +
>> +/* RT5033 FLED Function2 register */
>> +#define RT5033_FLED_FUNC2_MASK        0x81
>> +#define RT5033_FLED_ENFLED        0x01
>> +#define RT5033_FLED_SREG_STRB        0x80
>> +
>> +/* RT5033 FLED Strobe Control1 */
>> +#define RT5033_FLED_STRBCTRL1_MASK        0xFF
>> +#define RT5033_FLED_STRBCTRL1_TM_CUR_MAX    0xE0
>> +#define RT5033_FLED_STRBCTRL1_FL_CUR_DEF    0x0D
>> +#define RT5033_FLED_STRBCTRL1_FL_CUR_MAX    0x1F
>> +
>> +/* RT5033 FLED Strobe Control2 */
>> +#define RT5033_FLED_STRBCTRL2_MASK    0x3F
>> +#define RT5033_FLED_STRBCTRL2_TM_DEF    0x0F
>> +#define RT5033_FLED_STRBCTRL2_TM_MAX    0x3F
>> +
>> +/* RT5033 FLED Control1 */
>> +#define RT5033_FLED_CTRL1_MASK        0xF7
>> +#define RT5033_FLED_CTRL1_TORCH_CUR_DEF    0x20
>> +#define RT5033_FLED_CTRL1_TORCH_CUR_MAX    0xF0
>> +#define RT5033_FLED_CTRL1_LBP_DEF    0x02
>> +#define RT5033_FLED_CTRL1_LBP_MAX    0x07
>> +
>> +/* RT5033 FLED Control2 */
>> +#define RT5033_FLED_CTRL2_MASK        0xFF
>> +#define RT5033_FLED_CTRL2_VMID_DEF    0x37
>> +#define RT5033_FLED_CTRL2_VMID_MAX    0x3F
>> +#define RT5033_FLED_CTRL2_TRACK_ALIVE    0x40
>> +#define RT5033_FLED_CTRL2_MID_TRACK    0x80
>> +
>> +/* RT5033 FLED Control4 */
>> +#define RT5033_FLED_CTRL4_MASK        0xE0
>> +#define RT5033_FLED_CTRL4_RESV        0x14
>> +#define RT5033_FLED_CTRL4_VTRREG_DEF    0x40
>> +#define RT5033_FLED_CTRL4_VTRREG_MAX    0x60
>> +#define RT5033_FLED_CTRL4_TRACK_CLK    0x80
>> +
>> +/* RT5033 FLED Control5 */
>> +#define RT5033_FLED_CTRL5_MASK        0xC0
>> +#define RT5033_FLED_CTRL5_RESV        0x10
>> +#define RT5033_FLED_CTRL5_TA_GOOD    0x40
>> +#define RT5033_FLED_CTRL5_TA_EXIST    0x80
>> +
>>   /* RT5033 control register */
>>   #define RT5033_CTRL_FCCM_BUCK_MASK        0x00
>>   #define RT5033_CTRL_BUCKOMS_MASK        0x01
>>
> 
> [1] Documentation/sparse.txt
> 

Re: [PATCH v4 2/2] leds: rt5033: Add RT5033 Flash led device driver

[Jacek Anaszewski]

Hi Ingi,

On 11/12/2015 08:57 AM, Ingi Kim wrote:
[...]
>>> +        regmap_write(led->regmap, RT5033_REG_FLED_FUNCTION1, val);
>>> +    } else {
>>> +        regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1,
>>> +                   RT5033_FLED_FUNC1_MASK, RT5033_FLED_PINCTRL |
>>> +                   rt5033_fled_used(led, fled_id));
>>> +        regmap_update_bits(led->regmap,    RT5033_REG_FLED_CTRL1,
>>> +                   RT5033_FLED_CTRL1_MASK,
>>> +                   (brightness - 1) << 4);
>>> +        regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION2,
>>> +                   RT5033_FLED_FUNC2_MASK, RT5033_FLED_ENFLED);
>>> +    }
>>
>> How are you distinguishing between setting brightness for iout_joint
>> case and for individual LEDs? Have you tested this use case?
>> Even if you don't have a board with two separate LEDs,
>> you should be able to test two LED class devices with a single
>> connected LED.
>>
>
> Thanks, I missed a iout_joint case :(
> I have tested a board with integrated single LED,
> It looks fine and all feature works well even if it has limitation.

Please also test two separate LEDs case, by defining two child
nodes in DT, and in a result you will get two LED class devices.
After that you can set brightness separately for each LED class
device, and you'll be able to verify that the driver works properly
by observing the single LED connected to both outputs.
In order to make the testing even more valuable, you can
set triggers for both LEDs

-- 
Best Regards,
Jacek Anaszewski

Re: [PATCH v4 2/2] leds: rt5033: Add RT5033 Flash led device driver

[Ingi Kim]

Hi Jacek,

On 2015년 11월 12일 18:21, Jacek Anaszewski wrote:
> Hi Ingi,
> 
> On 11/12/2015 08:57 AM, Ingi Kim wrote:
> [...]
>>>> +        regmap_write(led->regmap, RT5033_REG_FLED_FUNCTION1, val);
>>>> +    } else {
>>>> +        regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1,
>>>> +                   RT5033_FLED_FUNC1_MASK, RT5033_FLED_PINCTRL |
>>>> +                   rt5033_fled_used(led, fled_id));
>>>> +        regmap_update_bits(led->regmap,    RT5033_REG_FLED_CTRL1,
>>>> +                   RT5033_FLED_CTRL1_MASK,
>>>> +                   (brightness - 1) << 4);
>>>> +        regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION2,
>>>> +                   RT5033_FLED_FUNC2_MASK, RT5033_FLED_ENFLED);
>>>> +    }
>>>
>>> How are you distinguishing between setting brightness for iout_joint
>>> case and for individual LEDs? Have you tested this use case?
>>> Even if you don't have a board with two separate LEDs,
>>> you should be able to test two LED class devices with a single
>>> connected LED.
>>>
>>
>> Thanks, I missed a iout_joint case :(
>> I have tested a board with integrated single LED,
>> It looks fine and all feature works well even if it has limitation.
> 
> Please also test two separate LEDs case, by defining two child
> nodes in DT, and in a result you will get two LED class devices.
> After that you can set brightness separately for each LED class
> device, and you'll be able to verify that the driver works properly
> by observing the single LED connected to both outputs.
> In order to make the testing even more valuable, you can
> set triggers for both LEDs
> 

Oh, I ask of you, please do not misconstrue.
I'm sorry if my expression is rather misleading.

I have verified this driver works properly.
It already tested with two child nodes and observed single LED
that is connected to both outputs.

I just wanted to say that it works properly as you said.