kernel: backport LED patch which will allow better DT integration

It's not used by any driver yet, it may just simplify development and
testing new features.

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

1 files changed, 53 insertions, 0 deletions

diff --git a/target/linux/generic/patches-4.4/085-0001-leds-leds-gpio-Set-of_node-for-created-LED-devices.patch b/target/linux/generic/patches-4.4/085-0001-leds-leds-gpio-Set-of_node-for-created-LED-devices.patch
new file mode 100644
index 0000000000..f60b1fc16b
--- /dev/null
+++ b/target/linux/generic/patches-4.4/085-0001-leds-leds-gpio-Set-of_node-for-created-LED-devices.patch
@@ -0,0 +1,53 @@
+From bff23714bc36a1322d0f14519022df0d1a4b21f3 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
+Date: Fri, 8 Jul 2016 14:53:38 +0200
+Subject: [PATCH] leds: leds-gpio: Set of_node for created LED devices
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+When working with Device Tree we iterate over children of "gpio-leds"
+compatible node and create LED device for each of them. We take care of
+all common DT properties (label, default trigger, state, etc.), however
+some triggers may want to support more of them.
+
+It could be useful for timer trigger to support setting delay on/off
+values with Device Tree property. Or for transient trigger to support
+e.g. duration property.
+
+We obviously should handle such properties in triggers, not in generic
+code. To let trigger drivers read properties from DT node we need to set
+of_node to point the relevant node. This change allows using all kind of
+of helpers in e.g. "activate" callbacks.
+
+Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
+Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
+---
+ drivers/leds/leds-gpio.c | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+--- a/drivers/leds/leds-gpio.c
++++ b/drivers/leds/leds-gpio.c
+@@ -182,6 +182,7 @@ static struct gpio_leds_priv *gpio_leds_
+ 		return ERR_PTR(-ENOMEM);
+ 
+ 	device_for_each_child_node(dev, child) {
++		struct gpio_led_data *led_dat = &priv->leds[priv->num_leds];
+ 		struct gpio_led led = {};
+ 		const char *state = NULL;
+ 
+@@ -220,12 +221,12 @@ 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, &priv->leds[priv->num_leds],
+-				      dev, NULL);
++		ret = create_gpio_led(&led, led_dat, dev, NULL);
+ 		if (ret < 0) {
+ 			fwnode_handle_put(child);
+ 			goto err;
+ 		}
++		led_dat->cdev.dev->of_node = np;
+ 		priv->num_leds++;
+ 	}
+