[PATCH v4 13/22] backlight: Probe backlight devices on demand

From: Tomeu Vizoso
Date: Mon Sep 07 2015 - 08:25:13 EST

When looking up a backlight device through its OF node, probe it if it
hasn't already.

The goal is to reduce deferred probes to a minimum, as it makes it very
cumbersome to find out why a device failed to probe, and can introduce
very big delays in when a critical device is probed.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>

Changes in v4: None
Changes in v3: None
Changes in v2: None

drivers/video/backlight/backlight.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index bddc8b17a4d8..9bcdc16eacdf 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -16,6 +16,7 @@
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/slab.h>
+#include <linux/of_device.h>

#include <asm/backlight.h>
@@ -559,6 +560,8 @@ struct backlight_device *of_find_backlight_by_node(struct device_node *node)
struct device *dev;

+ of_device_probe(node);
dev = class_find_device(backlight_class, NULL, node, of_parent_match);

return dev ? to_backlight_device(dev) : NULL;

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