[U-Boot] [RFC PATCH] dm: device: Do not probe parents which are probed already

[Michal Simek]

>From the first look there is no reason to probe parent nodes if they are
active already.

Signed-off-by: Michal Simek <michal.simek at xilinx.com>
---

I have created this just for showing status of parent device.
Maybe there is any strong reason to do this but I just wanted to check
this because it looks like just wasting of time.

Just revert this condition when you want to see outputs.
if (dev->parent && !(dev->parent->flags & DM_FLAG_ACTIVATED)) {

Without this line

99   amba @ 7df04d20
100   amba @ 7df04d20
99 * root_driver @ 7df04960, seq 0, (req -1)
100 * root_driver @ 7df04960, seq 0, (req -1)
99 * root_driver @ 7df04960, seq 0, (req -1)
100 * root_driver @ 7df04960, seq 0, (req -1)
99 * root_driver @ 7df04960, seq 0, (req -1)
100 * root_driver @ 7df04960, seq 0, (req -1)
99 * root_driver @ 7df04960, seq 0, (req -1)
100 * root_driver @ 7df04960, seq 0, (req -1)
99 * root_driver @ 7df04960, seq 0, (req -1)
100 * root_driver @ 7df04960, seq 0, (req -1)
99 * root_driver @ 7df04960, seq 0, (req -1)
100 * root_driver @ 7df04960, seq 0, (req -1)
99 * root_driver @ 7df04960, seq 0, (req -1)
100 * root_driver @ 7df04960, seq 0, (req -1)
MMC:   99 * amba @ 7df04d20, seq 0, (req -1)
100 * amba @ 7df04d20, seq 0, (req -1)

ZynqMP> i2c dev 0
Setting bus to 0
99 * amba @ 7df04d20, seq 0, (req -1)
100 * amba @ 7df04d20, seq 0, (req -1)

with this line added

99   amba @ 7df04d20
100   amba @ 7df04d20
99 * root_driver @ 7df04960, seq 0, (req -1)
99 * root_driver @ 7df04960, seq 0, (req -1)
99 * root_driver @ 7df04960, seq 0, (req -1)
99 * root_driver @ 7df04960, seq 0, (req -1)
99 * root_driver @ 7df04960, seq 0, (req -1)
99 * root_driver @ 7df04960, seq 0, (req -1)
99 * root_driver @ 7df04960, seq 0, (req -1)
MMC:   99 * amba @ 7df04d20, seq 0, (req -1)

ZynqMP> i2c dev 0
Setting bus to 0
99 * amba @ 7df04d20, seq 0, (req -1)

---
 drivers/core/device.c | 7 ++++++-
 drivers/core/dump.c   | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/core/device.c b/drivers/core/device.c
index 0d15e5062b66..114888a8f7cf 100644
--- a/drivers/core/device.c
+++ b/drivers/core/device.c
@@ -341,8 +341,13 @@ int device_probe(struct udevice *dev)
 		}
 	}
 
+	if (dev->parent)
+		dm_display_line(dev->parent, 99);
+
 	/* Ensure all parents are probed */
-	if (dev->parent) {
+	if (dev->parent && !(dev->parent->flags & DM_FLAG_ACTIVATED)) {
+		dm_display_line(dev->parent, 100);
+
 		size = dev->parent->driver->per_child_auto_alloc_size;
 		if (!size) {
 			size = dev->parent->uclass->uc_drv->
diff --git a/drivers/core/dump.c b/drivers/core/dump.c
index 8fbfd93fb5e4..95ba7dcb9193 100644
--- a/drivers/core/dump.c
+++ b/drivers/core/dump.c
@@ -62,7 +62,7 @@ void dm_dump_all(void)
  *
  * @dev:	Device to display
  */
-static void dm_display_line(struct udevice *dev, int index)
+void dm_display_line(struct udevice *dev, int index)
 {
 	printf("%i %c %s @ %08lx", index,
 	       dev->flags & DM_FLAG_ACTIVATED ? '*' : ' ',
-- 
1.9.1