kernel: fix of_node handling in LEDs core code

This backports fixes for setting of_node and making it possible to read
extra info from DT. This was partially fixed by:
[PATCH] leds: leds-gpio: Set of_node for created LED devices
but it didn't work during initialization.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

4 files changed, 316 insertions, 0 deletions

diff --git a/target/linux/generic/patches-4.4/085-0002-leds-gpio-introduce-gpio_blink_set_t.patch b/target/linux/generic/patches-4.4/085-0002-leds-gpio-introduce-gpio_blink_set_t.patch
new file mode 100644
index 0000000..670d4ba
--- /dev/null
+++ b/target/linux/generic/patches-4.4/085-0002-leds-gpio-introduce-gpio_blink_set_t.patch
@@ -0,0 +1,61 @@
+From 68620e594c250ba8c43a78e77f5296cb9952582e Mon Sep 17 00:00:00 2001
+From: Heiner Kallweit <hkallweit1@gmail.com>
+Date: Wed, 14 Sep 2016 20:54:12 +0200
+Subject: [PATCH] leds: gpio: introduce gpio_blink_set_t
+
+Introduce a typedef gpio_blink_set_t to improve readability of the code.
+
+Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
+Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
+---
+ drivers/leds/leds-gpio.c | 6 ++----
+ include/linux/leds.h     | 9 ++++++---
+ 2 files changed, 8 insertions(+), 7 deletions(-)
+
+--- a/drivers/leds/leds-gpio.c
++++ b/drivers/leds/leds-gpio.c
+@@ -29,8 +29,7 @@ struct gpio_led_data {
+ 	u8 new_level;
+ 	u8 can_sleep;
+ 	u8 blinking;
+-	int (*platform_gpio_blink_set)(struct gpio_desc *desc, int state,
+-			unsigned long *delay_on, unsigned long *delay_off);
++	gpio_blink_set_t platform_gpio_blink_set;
+ };
+ 
+ static void gpio_led_work(struct work_struct *work)
+@@ -88,8 +87,7 @@ static int gpio_blink_set(struct led_cla
+ 
+ static int create_gpio_led(const struct gpio_led *template,
+ 	struct gpio_led_data *led_dat, struct device *parent,
+-	int (*blink_set)(struct gpio_desc *, int, unsigned long *,
+-			 unsigned long *))
++	gpio_blink_set_t blink_set)
+ {
+ 	int ret, state;
+ 
+--- a/include/linux/leds.h
++++ b/include/linux/leds.h
+@@ -330,6 +330,11 @@ struct led_platform_data {
+ 	struct led_info	*leds;
+ };
+ 
++struct gpio_desc;
++typedef int (*gpio_blink_set_t)(struct gpio_desc *desc, int state,
++				unsigned long *delay_on,
++				unsigned long *delay_off);
++
+ /* For the leds-gpio driver */
+ struct gpio_led {
+ 	const char *name;
+@@ -352,9 +357,7 @@ struct gpio_led_platform_data {
+ #define GPIO_LED_NO_BLINK_LOW	0	/* No blink GPIO state low */
+ #define GPIO_LED_NO_BLINK_HIGH	1	/* No blink GPIO state high */
+ #define GPIO_LED_BLINK		2	/* Please, blink */
+-	int		(*gpio_blink_set)(struct gpio_desc *desc, int state,
+-					unsigned long *delay_on,
+-					unsigned long *delay_off);
++	gpio_blink_set_t	gpio_blink_set;
+ };
+ 
+ struct platform_device *gpio_led_register_device(
diff --git a/target/linux/generic/patches-4.4/085-0003-leds-gpio-switch-to-managed-version-of-led_classdev_.patch b/target/linux/generic/patches-4.4/085-0003-leds-gpio-switch-to-managed-version-of-led_classdev_.patch
new file mode 100644
index 0000000..7aa865a
--- /dev/null
+++ b/target/linux/generic/patches-4.4/085-0003-leds-gpio-switch-to-managed-version-of-led_classdev_.patch
@@ -0,0 +1,75 @@
+From bc2c0dd85a0a31505ca2f92bef891ddac9126725 Mon Sep 17 00:00:00 2001
+From: Heiner Kallweit <hkallweit1@gmail.com>
+Date: Wed, 14 Sep 2016 20:55:27 +0200
+Subject: [PATCH] leds: gpio: switch to managed version of
+ led_classdev_register
+
+Using the managed version of led_classdev_register allows to
+significantly simplify the code.
+
+Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
+Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
+---
+ drivers/leds/leds-gpio.c | 23 ++---------------------
+ 1 file changed, 2 insertions(+), 21 deletions(-)
+
+--- a/drivers/leds/leds-gpio.c
++++ b/drivers/leds/leds-gpio.c
+@@ -143,7 +143,7 @@ static int create_gpio_led(const struct
+ 
+ 	INIT_WORK(&led_dat->work, gpio_led_work);
+ 
+-	return led_classdev_register(parent, &led_dat->cdev);
++	return devm_led_classdev_register(parent, &led_dat->cdev);
+ }
+ 
+ static void delete_gpio_led(struct gpio_led_data *led)
+@@ -231,8 +231,6 @@ static struct gpio_leds_priv *gpio_leds_
+ 	return priv;
+ 
+ err:
+-	for (count = priv->num_leds - 1; count >= 0; count--)
+-		delete_gpio_led(&priv->leds[count]);
+ 	return ERR_PTR(ret);
+ }
+ 
+@@ -261,12 +259,8 @@ static int gpio_led_probe(struct platfor
+ 			ret = create_gpio_led(&pdata->leds[i],
+ 					      &priv->leds[i],
+ 					      &pdev->dev, pdata->gpio_blink_set);
+-			if (ret < 0) {
+-				/* On failure: unwind the led creations */
+-				for (i = i - 1; i >= 0; i--)
+-					delete_gpio_led(&priv->leds[i]);
++			if (ret < 0)
+ 				return ret;
+-			}
+ 		}
+ 	} else {
+ 		priv = gpio_leds_create(pdev);
+@@ -279,17 +273,6 @@ static int gpio_led_probe(struct platfor
+ 	return 0;
+ }
+ 
+-static int gpio_led_remove(struct platform_device *pdev)
+-{
+-	struct gpio_leds_priv *priv = platform_get_drvdata(pdev);
+-	int i;
+-
+-	for (i = 0; i < priv->num_leds; i++)
+-		delete_gpio_led(&priv->leds[i]);
+-
+-	return 0;
+-}
+-
+ static void gpio_led_shutdown(struct platform_device *pdev)
+ {
+ 	struct gpio_leds_priv *priv = platform_get_drvdata(pdev);
+@@ -304,7 +287,6 @@ static void gpio_led_shutdown(struct pla
+ 
+ static struct platform_driver gpio_led_driver = {
+ 	.probe		= gpio_led_probe,
+-	.remove		= gpio_led_remove,
+ 	.shutdown	= gpio_led_shutdown,
+ 	.driver		= {
+ 		.name	= "leds-gpio",
diff --git a/target/linux/generic/patches-4.4/085-0004-leds-core-add-OF-variants-of-LED-registering-functio.patch b/target/linux/generic/patches-4.4/085-0004-leds-core-add-OF-variants-of-LED-registering-functio.patch
new file mode 100644
index 0000000..e029840
--- /dev/null
+++ b/target/linux/generic/patches-4.4/085-0004-leds-core-add-OF-variants-of-LED-registering-functio.patch
@@ -0,0 +1,120 @@
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Mon, 6 Mar 2017 06:19:44 +0100
+Subject: [PATCH] leds: core: add OF variants of LED registering functions
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+These new functions allow passing an additional device_node argument
+that will be internally set for created LED device. Thanks to this LED
+core code and triggers will be able to access DT node for reading extra
+info.
+
+The easiest solution for achieving this was reworking old functions to
+more generic ones & adding simple defines for API compatibility.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Acked-by: Pavel Machek <pavel@ucw.cz>
+Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
+---
+ drivers/leds/led-class.c | 26 ++++++++++++++++----------
+ include/linux/leds.h     | 14 ++++++++++----
+ 2 files changed, 26 insertions(+), 14 deletions(-)
+
+--- a/drivers/leds/led-class.c
++++ b/drivers/leds/led-class.c
+@@ -181,11 +181,14 @@ static int led_classdev_next_name(const
+ }
+ 
+ /**
+- * led_classdev_register - register a new object of led_classdev class.
+- * @parent: The device to register.
++ * of_led_classdev_register - register a new object of led_classdev class.
++ *
++ * @parent: parent of LED device
+  * @led_cdev: the led_classdev structure for this device.
++ * @np: DT node describing this LED
+  */
+-int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
++int of_led_classdev_register(struct device *parent, struct device_node *np,
++			    struct led_classdev *led_cdev)
+ {
+ 	char name[64];
+ 	int ret;
+@@ -198,6 +201,7 @@ int led_classdev_register(struct device
+ 				led_cdev, led_cdev->groups, "%s", name);
+ 	if (IS_ERR(led_cdev->dev))
+ 		return PTR_ERR(led_cdev->dev);
++	led_cdev->dev->of_node = np;
+ 
+ 	if (ret)
+ 		dev_warn(parent, "Led %s renamed to %s due to name collision",
+@@ -230,7 +234,7 @@ int led_classdev_register(struct device
+ 
+ 	return 0;
+ }
+-EXPORT_SYMBOL_GPL(led_classdev_register);
++EXPORT_SYMBOL_GPL(of_led_classdev_register);
+ 
+ /**
+  * led_classdev_unregister - unregisters a object of led_properties class.
+@@ -269,12 +273,14 @@ static void devm_led_classdev_release(st
+ }
+ 
+ /**
+- * devm_led_classdev_register - resource managed led_classdev_register()
+- * @parent: The device to register.
++ * devm_of_led_classdev_register - resource managed led_classdev_register()
++ *
++ * @parent: parent of LED device
+  * @led_cdev: the led_classdev structure for this device.
+  */
+-int devm_led_classdev_register(struct device *parent,
+-			       struct led_classdev *led_cdev)
++int devm_of_led_classdev_register(struct device *parent,
++				  struct device_node *np,
++				  struct led_classdev *led_cdev)
+ {
+ 	struct led_classdev **dr;
+ 	int rc;
+@@ -283,7 +289,7 @@ int devm_led_classdev_register(struct de
+ 	if (!dr)
+ 		return -ENOMEM;
+ 
+-	rc = led_classdev_register(parent, led_cdev);
++	rc = of_led_classdev_register(parent, np, led_cdev);
+ 	if (rc) {
+ 		devres_free(dr);
+ 		return rc;
+@@ -294,7 +300,7 @@ int devm_led_classdev_register(struct de
+ 
+ 	return 0;
+ }
+-EXPORT_SYMBOL_GPL(devm_led_classdev_register);
++EXPORT_SYMBOL_GPL(devm_of_led_classdev_register);
+ 
+ static int devm_led_classdev_match(struct device *dev, void *res, void *data)
+ {
+--- a/include/linux/leds.h
++++ b/include/linux/leds.h
+@@ -103,10 +103,16 @@ struct led_classdev {
+ 	struct mutex		led_access;
+ };
+ 
+-extern int led_classdev_register(struct device *parent,
+-				 struct led_classdev *led_cdev);
+-extern int devm_led_classdev_register(struct device *parent,
+-				      struct led_classdev *led_cdev);
++extern int of_led_classdev_register(struct device *parent,
++				    struct device_node *np,
++				    struct led_classdev *led_cdev);
++#define led_classdev_register(parent, led_cdev)				\
++	of_led_classdev_register(parent, NULL, led_cdev)
++extern int devm_of_led_classdev_register(struct device *parent,
++					 struct device_node *np,
++					 struct led_classdev *led_cdev);
++#define devm_led_classdev_register(parent, led_cdev)			\
++	devm_of_led_classdev_register(parent, NULL, led_cdev)
+ extern void led_classdev_unregister(struct led_classdev *led_cdev);
+ extern void devm_led_classdev_unregister(struct device *parent,
+ 					 struct led_classdev *led_cdev);
diff --git a/target/linux/generic/patches-4.4/085-0005-leds-gpio-use-OF-variant-of-LED-registering-function.patch b/target/linux/generic/patches-4.4/085-0005-leds-gpio-use-OF-variant-of-LED-registering-function.patch
new file mode 100644
index 0000000..159fae8
--- /dev/null
+++ b/target/linux/generic/patches-4.4/085-0005-leds-gpio-use-OF-variant-of-LED-registering-function.patch
@@ -0,0 +1,60 @@
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Mon, 6 Mar 2017 06:19:45 +0100
+Subject: [PATCH] leds: gpio: use OF variant of LED registering function
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+In leds-gpio we support LEDs specified in DT so we should use
+(devm_)of_led_classdev_register. This allows passing DT node as argument
+for use by the LED subsystem.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Acked-by: Pavel Machek <pavel@ucw.cz>
+Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
+---
+ drivers/leds/leds-gpio.c | 12 ++++++------
+ 1 file changed, 6 insertions(+), 6 deletions(-)
+
+--- a/drivers/leds/leds-gpio.c
++++ b/drivers/leds/leds-gpio.c
+@@ -87,7 +87,7 @@ static int gpio_blink_set(struct led_cla
+ 
+ static int create_gpio_led(const struct gpio_led *template,
+ 	struct gpio_led_data *led_dat, struct device *parent,
+-	gpio_blink_set_t blink_set)
++	struct device_node *np, gpio_blink_set_t blink_set)
+ {
+ 	int ret, state;
+ 
+@@ -143,7 +143,7 @@ static int create_gpio_led(const struct
+ 
+ 	INIT_WORK(&led_dat->work, gpio_led_work);
+ 
+-	return devm_led_classdev_register(parent, &led_dat->cdev);
++	return devm_of_led_classdev_register(parent, np, &led_dat->cdev);
+ }
+ 
+ static void delete_gpio_led(struct gpio_led_data *led)
+@@ -219,7 +219,7 @@ static struct gpio_leds_priv *gpio_leds_
+ 		if (fwnode_property_present(child, "retain-state-suspended"))
+ 			led.retain_state_suspended = 1;
+ 
+-		ret = create_gpio_led(&led, led_dat, dev, NULL);
++		ret = create_gpio_led(&led, led_dat, dev, np, NULL);
+ 		if (ret < 0) {
+ 			fwnode_handle_put(child);
+ 			goto err;
+@@ -256,9 +256,9 @@ static int gpio_led_probe(struct platfor
+ 
+ 		priv->num_leds = pdata->num_leds;
+ 		for (i = 0; i < priv->num_leds; i++) {
+-			ret = create_gpio_led(&pdata->leds[i],
+-					      &priv->leds[i],
+-					      &pdev->dev, pdata->gpio_blink_set);
++			ret = create_gpio_led(&pdata->leds[i], &priv->leds[i],
++					      &pdev->dev, NULL,
++					      pdata->gpio_blink_set);
+ 			if (ret < 0)
+ 				return ret;
+ 		}