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kernel: backport LED patch which will allow better DT integration

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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>
This commit is contained in:
Rafał Miłecki 2016-12-06 19:48:20 +01:00
parent 4b3f9bc28d
commit 0422f8bcec
1 changed files with 53 additions and 0 deletions
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53
target/linux/generic/patches-4.4/085-0001-leds-leds-gpio-Set-of_node-for-created-LED-devices.patch Normal file
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@ -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++;
}