diff options
| -rw-r--r-- | drivers/rtc/class.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c index 02426812bebc..589351ef75d0 100644 --- a/drivers/rtc/class.c +++ b/drivers/rtc/class.c @@ -14,6 +14,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> +#include <linux/of.h> #include <linux/rtc.h> #include <linux/kdev_t.h> #include <linux/idr.h> @@ -157,12 +158,27 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev, { struct rtc_device *rtc; struct rtc_wkalrm alrm; - int id, err; + int of_id = -1, id = -1, err; + + if (dev->of_node) + of_id = of_alias_get_id(dev->of_node, "rtc"); + else if (dev->parent && dev->parent->of_node) + of_id = of_alias_get_id(dev->parent->of_node, "rtc"); + + if (of_id >= 0) { + id = ida_simple_get(&rtc_ida, of_id, of_id + 1, + GFP_KERNEL); + if (id < 0) + dev_warn(dev, "/aliases ID %d not available\n", + of_id); + } - id = ida_simple_get(&rtc_ida, 0, 0, GFP_KERNEL); if (id < 0) { - err = id; - goto exit; + id = ida_simple_get(&rtc_ida, 0, 0, GFP_KERNEL); + if (id < 0) { + err = id; + goto exit; + } } rtc = kzalloc(sizeof(struct rtc_device), GFP_KERNEL); |