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arm64: zynqmp: Try to enable the first watchdog via aliases

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Add support for enabling the first watchdog pointed via aliases.

DT fragment:
	aliases {
		...
		watchdog0 = &watchdog0;
		watchdog1 = &watchdog_lpd;
		...
	};

dm tree fragment for above configuration with patch applied:
ZynqMP> dm tree
 Class    index  Probed  Driver      Name
-----------------------------------------
...
 watchdog    0  [   ]   cdns_wdt    |   |-- watchdog@ff150000
 watchdog    1  [ + ]   cdns_wdt    |   `-- watchdog@fd4d0000
...

dm uclass fragment:
ZynqMP> dm uclass
...
uclass 75: watchdog
0   watchdog@ff150000 @ 7df02f40, seq -1, (req 1)
1 * watchdog@fd4d0000 @ 7df02ff0, seq 0, (req 0)
...

It is visible that index 1 is IP with seq 0 which means that FPD
watchdog (@fd4d0000) is in DT below LPD watchdog (@ff150000).

Till this patch the first watchdog found in DT was used and started
which is not enabling all possible configuration based on user request.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Michal Simek 2018-07-11 08:30:07 +02:00
parent 0d6fabb82d
commit 1fbca0db5d
1 changed files with 9 additions and 5 deletions
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14
board/xilinx/zynqmp/zynqmp.c
View File

@ -312,12 +312,16 @@ int board_init(void)
#endif
#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT)
if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) {
puts("Watchdog: Not found!\n");
} else {
wdt_start(watchdog_dev, 0, 0);
puts("Watchdog: Started\n");
if (uclass_get_device_by_seq(UCLASS_WDT, 0, &watchdog_dev)) {
debug("Watchdog: Not found by seq!\n");
if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) {
puts("Watchdog: Not found!\n");
return 0;
}
}
wdt_start(watchdog_dev, 0, 0);
puts("Watchdog: Started\n");
#endif
return 0;