The patch titled
Subject: backlight: add of_find_backlight_by_node()
has been added to the -mm tree. Its filename is
backlight-add-of_find_backlight_by_node-function.patch
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------------------------------------------------------
From: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>
Subject: backlight: add of_find_backlight_by_node()
This function finds the struct backlight_device for a given device tree
node. A dummy function is provided so that it safely compiles out if OF
support is disabled.
Signed-off-by: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>
Acked-by: Jingoo Han <jg1.han@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/video/backlight/backlight.c | 17 +++++++++++++++++
include/linux/backlight.h | 10 ++++++++++
2 files changed, 27 insertions(+)
diff -puN drivers/video/backlight/backlight.c~backlight-add-of_find_backlight_by_node-function drivers/video/backlight/backlight.c
--- a/drivers/video/backlight/backlight.c~backlight-add-of_find_backlight_by_node-function
+++ a/drivers/video/backlight/backlight.c
@@ -370,6 +370,23 @@ void backlight_device_unregister(struct
}
EXPORT_SYMBOL(backlight_device_unregister);
+#if IS_ENABLED(CONFIG_OF)
+static int of_parent_match(struct device *dev, void *data)
+{
+ return dev->parent && dev->parent->of_node == data;
+}
+
+struct backlight_device *of_find_backlight_by_node(struct device_node *node)
+{
+ struct device *dev;
+
+ dev = class_find_device(backlight_class, NULL, node, of_parent_match);
+
+ return dev ? to_backlight_device(dev) : NULL;
+}
+EXPORT_SYMBOL(of_find_backlight_by_node);
+#endif
+
static void __exit backlight_class_exit(void)
{
class_destroy(backlight_class);
diff -puN include/linux/backlight.h~backlight-add-of_find_backlight_by_node-function include/linux/backlight.h
--- a/include/linux/backlight.h~backlight-add-of_find_backlight_by_node-function
+++ a/include/linux/backlight.h
@@ -134,4 +134,14 @@ struct generic_bl_info {
void (*kick_battery)(void);
};
+#if IS_ENABLED(CONFIG_OF)
+struct backlight_device *of_find_backlight_by_node(struct device_node *node);
+#else
+static inline struct backlight_device *
+of_find_backlight_by_node(struct device_node *node)
+{
+ return NULL;
+}
+#endif
+
#endif
_
Patches currently in -mm which might be from thierry.reding@xxxxxxxxxxxxxxxxx are
origin.patch
linux-next.patch
mm-compaction-fix-compiler-warning.patch
drivers-video-backlight-lp855x_blc-use-generic-pwm-functions.patch
drivers-video-backlight-lp855x_blc-use-generic-pwm-functions-fix.patch
drivers-video-backlight-lp855x_blc-remove-unnecessary-mutex-code.patch
backlight-add-of_find_backlight_by_node-function.patch
backlight-add-of_find_backlight_by_node-function-fix.patch
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