Currently there is no way to easily differentiate multiple
watchdog devices. The watchdogs are named by the order they
are probed.
1st probed watchdog: /dev/watchdog0
2nd probed watchdog: /dev/watchdog1
...
This change uses the alias of the watchdog device node for
the name of the watchdog.
aliases {
watchdog0 = "/...../...."
watchdog3 = "/..../....."
watchdog2 = "/..../....."
...
}
This will translate to...
/dev/watchdog0
/dev/watchdog3
/dev/watchdog2
v2
Assign alias number to id in watchdog_core instead of watchdog_dev.
If failed to get id, fallback to original ida_simple_get call.
Signed-off-by: Justin Chen <[email protected]>
---
drivers/watchdog/watchdog_core.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/watchdog/watchdog_core.c b/drivers/watchdog/watchdog_core.c
index 1a80594..873f139 100644
--- a/drivers/watchdog/watchdog_core.c
+++ b/drivers/watchdog/watchdog_core.c
@@ -139,7 +139,7 @@ EXPORT_SYMBOL_GPL(watchdog_init_timeout);
static int __watchdog_register_device(struct watchdog_device *wdd)
{
- int ret, id, devno;
+ int ret, id = -1, devno;
if (wdd == NULL || wdd->info == NULL || wdd->ops == NULL)
return -EINVAL;
@@ -157,7 +157,18 @@ static int __watchdog_register_device(struct
watchdog_device *wdd)
*/
mutex_init(&wdd->lock);
- id = ida_simple_get(&watchdog_ida, 0, MAX_DOGS, GFP_KERNEL);
+
+ /* Use alias for watchdog id if possible */
+ if (wdd->parent) {
+ ret = of_alias_get_id(wdd->parent->of_node, "watchdog");
+ if (ret >= 0)
+ id = ida_simple_get(&watchdog_ida, ret,
+ ret + 1, GFP_KERNEL);
+ }
+
+ if (id < 0)
+ id = ida_simple_get(&watchdog_ida, 0, MAX_DOGS, GFP_KERNEL);
+
if (id < 0)
return id;
wdd->id = id;
--
2.1.0
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